Consulta: subjectFacets:"Water stress"
Registros recuperados: 112
Data/hora: 05/06/2024 14:49:34

Respuesta bioquímico-fisiológicas al estrés hídrico de dos variedades de frijol: resistente Pinto Villa y susceptible Bayo Madero
Provedor de dados: 32
Autores: Herrera Flores, Teresa Susana.
Existen indicadores bioquímicos, fisiológicos, morfológicos y fenológicos de la  respuesta de las plantas al déficit de humedad, que pueden ser utilizados de  manera práctica por los fitomejoradores, con el fin de optimizar la selección de  plantas tolerantes al estrés en diferentes cultivos agrícolas. El objetivo principal  fue: evaluar el efecto del déficit hídrico sobre la elongación, y la acumulación de  biomasa y de compuestos bioquímicos en la radícula y en las hojas de las  variedades Pinto Villa resistente y Bayo Madero susceptible a la sequía. La  investigación se dividió en tres fases; en la primera, se estudió el efecto del estrés  hídrico en la elongación y la acumulación de biomasa en la radícula, así como la  cuantificación de la...
Tipo: Tesis
Palavras-chave: Estrés hídrico; Frijol; Respuestas bioquímicas; Solutos; Doctorado; Fisiología Vegetal; Water stress; Biochemical responses; Common bean; Solutes.
Ano: 2008
URL: http://hdl.handle.net/10521/1391

Crecimiento y estructura de la raíz en plantas de Pinus pinceana sometidas a dos condiciones de humedad del suelo.
Provedor de dados: 32
Autores: Córdoba Rodríguez, Diana.
Pinus pinceana Gordon es un pino piñonero endémico que crece en poblaciones aisladas en condiciones semiáridas, en el noreste y centro-oriente de México. Con el propósito de identificar características de la raíz asociadas a mecanismos de adaptación ante condiciones de estrés hídrico, se evaluó el crecimiento y estructura de la raíz en plantas de seis poblaciones de la especie en dos condiciones de humedad del suelo. El estudio se realizó en plantas de tres años de edad y recién germinadas manteniendo la humedad del suelo cercana a capacidad de campo (S0) o por debajo de 20 % de humedad aprovechable (S1). Se determinó que en las plantas de tres años de edad, el estrés hídrico redujo en 27 % el número de raíces principales, en 51 % la biomasa de la raíz...
Palavras-chave: Pinus pinceana; Crecimiento de raíz; Distribución de biomasa; Estrés hídrico; Relación parte aérea/raíz; Sequía; Biomass allocation; Drought; Root growth; Shoot/root ratio; Water stress; Maestría; Forestal.
Ano: 2010
URL: http://hdl.handle.net/10521/225

Determinación del momento de riego mediante la temperatura de la cobertura foliar en el cultivo de jitomate bajo condiciones de invernadero.
Provedor de dados: 32
Autores: Rojas Acosta, Miguel.
Si el agua no es aplicada en tiempo y forma a los cultivos agrícolas, se corre el riesgo de que éstos sufran de estrés hídrico, cuyas consecuencias pueden reflejarse en el rendimiento y calidad del fruto. Para determinar el momento de riego en el presente trabajo se propone la generación de modelos lineales, a través del manejo de un equipo detector de humedad (TDR), termómetro infrarrojo y estación meteorológica  automatizada. La investigación se llevó a cabo en un invernadero del Colegio de Postgraduados, ubicado en el Campus Montecillo, Estado de México. Para analizar el estrés de la planta, se estableció un experimento con plantas de jitomate en sustratos con diferente diámetro de partículas, estas fueron: fina menor, igual a 2mm, media de 2 a 5mm y...
Palavras-chave: Estrés hídrico; Momento de riego; Termómetro infrarrojo; Temperatura foliar; Substrato; Water stress; Irrigation time; Infrared thermometer; Leaf temperature; Substrate; Doctorado; Hidrociencias.
Ano: 2009
URL: http://hdl.handle.net/10521/125

Crecimiento y estructura de la raíz en plantas de Pinus pinceana sometidas a dos condiciones de humedad del suelo.
Provedor de dados: 32
Autores: Córdoba Rodríguez, Diana.
Pinus pinceana Gordon es un pino piñonero endémico que crece en poblaciones aisladas en condiciones semiáridas, en el noreste y centro-oriente de México. Con el propósito de identificar características de la raíz asociadas a mecanismos de adaptación ante condiciones de estrés hídrico, se evaluó el crecimiento y estructura de la raíz en plantas de seis poblaciones de la especie en dos condiciones de humedad del suelo. El estudio se realizó en plantas de tres años de edad y recién germinadas manteniendo la humedad del suelo cercana a capacidad de campo (S0) o por debajo de 20 % de humedad aprovechable (S1). Se determinó que en las plantas de tres años de edad, el estrés hídrico redujo en 27 % el número de raíces principales, en 51 % la biomasa de la raíz...
Palavras-chave: Pinus pinceana; Crecimiento de raíz; Distribución de biomasa; Estrés hídrico; Relación parte aérea/raíz; Sequía; Biomass allocation; Drought; Root growth; Shoot/root ratio; Water stress; Maestría; Forestal.
Ano: 2010
URL: http://hdl.handle.net/10521/225

Aplicación de tecnologías de percepción remota en la estimación de rendimientos en caña de azúcar.
Provedor de dados: 32
Autores: Zenteno Cruz, Guillermo Alberto.
Los productores de caña de azúcar buscan constantemente formas de reducir costos, aumentar la productividad y los rendimientos, pero en general, son pocas las herramientas que se están aplicando para tal fin. Por otra parte, es cada vez más importante la predicción temprana del rendimiento de los cultivos que permita una planificación de políticas agrícolas y de seguridad alimentaria en una economía de mercado globalizado. Con el propósito de calibrar una metodología para enfrentar estos problemas, la presente investigación se llevó a cabo en la zona de abasto del Ingenio Emiliano Zapata, en Morelos, México, en una superficie de 10, 664 hectáreas, durante el ciclo agrícola 2009-2010. El propósito del estudio fue determinar una función matemática para...
Palavras-chave: Predicción temprana; Indices de vegetación; Estrés hídrico; Evapotranspiración; Saccharum officinarum; Early prediction; Vegetation indices; Water stress; Evapotranspiración; Maestría; Hidrociencias.
Ano: 2012
URL: http://hdl.handle.net/10521/737

Determinación del momento de riego mediante la temperatura de la cobertura foliar en el cultivo de jitomate bajo condiciones de invernadero.
Provedor de dados: 32
Autores: Rojas Acosta, Miguel.
Si el agua no es aplicada en tiempo y forma a los cultivos agrícolas, se corre el riesgo de que éstos sufran de estrés hídrico, cuyas consecuencias pueden reflejarse en el rendimiento y calidad del fruto. Para determinar el momento de riego en el presente trabajo se propone la generación de modelos lineales, a través del manejo de un equipo detector de humedad (TDR), termómetro infrarrojo y estación meteorológica  automatizada. La investigación se llevó a cabo en un invernadero del Colegio de Postgraduados, ubicado en el Campus Montecillo, Estado de México. Para analizar el estrés de la planta, se estableció un experimento con plantas de jitomate en sustratos con diferente diámetro de partículas, estas fueron: fina menor, igual a 2mm, media de 2 a 5mm y...
Palavras-chave: Estrés hídrico; Momento de riego; Termómetro infrarrojo; Temperatura foliar; Substrato; Water stress; Irrigation time; Infrared thermometer; Leaf temperature; Substrate; Doctorado; Hidrociencias.
Ano: 2009
URL: http://hdl.handle.net/10521/125

Changes in morpho-physiological attributes of Eucalyptus globulus plants in response to different drought hardening treatments
Provedor de dados: 69
Autores: Coopman,Rafael E; Jara,Jorge C; Bravo,Leon A; Sáez,Katia L; Mella,Gloria R; Escobar,Rene.
Morpho-physiological attributes exhibited in response to drought hardening at the end of the growing season of Eucalyptus globulus Labill under nursery conditions were studied to evaluate the effect of three drought hardening treatments in morpho-physiological traits used as suitable indicators of drought hardiness, such as, plant growth, root growth potential, plant water relationships and survival. Freezing resistance of drought hardened plants was also studied in order to evaluate cross hardening effects in cuttings of Eucalyptus globulus Labill. Drought hardening consisted in induced water stress by watering restriction, until plant stem xylem water potentials (&amp;#936;pd) reached to-0.2, -1.3 and -2.4 MPa. Two water stress-rewatering cycles were...
Tipo: Journal article
Palavras-chave: Freezing resistance; Root growth potential; Stem xylem water potential; Water stress; Water relationships.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200005

Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
Provedor de dados: 69
Autores: Coopman,Rafael E; Jara,Jorge C; Escobar,Rene; Corcuera,Luis J; Bravo,Leon A.
Eucalyptus globulus Labill is one of the most planted species in Chile, because of its fast growth and superior pulp qualities. Nevertheless, the incidence of drought and frost damage immediately after planting is frequent. The purpose of this work was to study the effect of drought hardening on frost resistance and on variations in morphological traits that may increase drought resistance at nursery phase in four genotypes of E. globulus Labill. Drought hardening treatments consisted in induced water stress by watering restriction, until pre-dawn stem xylem water potentials (&amp;#936;pd) reached -0.2, -1.8 and -2.6 MPa. Two water stress-rewatering cycles were applied during 54 days of hardening. Plant and root biomasses were affected by the interaction...
Tipo: Journal article
Palavras-chave: Biomass allocation; Cross hardening; Genotypic selection; Planting stock quality; Water stress.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100005

SUNFLOWER EMERGENCE AND INITIAL GROWTH IN SOIL WITH WATER EXCESS
Provedor de dados: 70
Autores: Loose,Luis H.; Heldwein,Arno B.; Lucas,Dioneia D. P.; Hinnah,Fernando D.; Bortoluzzi,Mateus P.
ABSTRACT: Sunflower crops are grown in different regions worldwide. However, the stress caused by water excess in the soil impairs this crop growth and yield. The aim of the present study was to determine the response of sunflower plants to long periods of water excess during initial development stages. Water excess treatments were applied at the initial development of these plants at the sowing day, three days after sowing, at plant emergence, and at V2 and V4 stages. The treatments had different duration periods (0, 48, 96, 144, 192, and 240 hours) and were applied at three sowing dates. The current experiment is factorial and was carried out according to a completely random design. Two plant pots, treated under greenhouse conditions, made up the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Water stress; Plant emergence; Growth reduction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400644

Ratoon sugarcane yield integrated drip-irrigation and nitrogen fertilization
Provedor de dados: 70
Autores: Uribe,Raúl A. M.; Gava,Glauber J. de C.; Saad,João C. C.; Kölln,Oriel T.
The aim of this study was to compare the use of water and nitrogen on ratoon sugarcane during irrigated and rain-fed conditions, and to assess the production potential of stalks and sugar with different rates of N-fertilizer on the subsurface drip-irrigated management. The experimental design was a randomized block with four replications for each experiment and treatments: (T1) irrigated, 0kg N ha-1; (T2) irrigated, 70kg N ha-1; (T3) irrigated, 140kg N ha-1; (T4) irrigated, 210kg N ha-1; (T5) not irrigated, 0kg N ha-1, and (T6) not irrigated, 140kg N ha-1. Biometric, technological, dry matter and yield variables were analyzed among the treatments. The irrigation system together with the application of N-fertilizer at 140kg ha-1 presented significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertigation; Nitrogen; Water stress; Sacharum spp.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600005

Differential gene expression and mitotic cell analysis of the drought tolerant soybean (Glycine max L. Merrill Fabales, Fabaceae) cultivar MG/BR46 (Conquista) under two water deficit induction systems
Provedor de dados: 74
Autores: Martins,Polyana K.; Jordão,Berenice Q.; Yamanaka,Naoki; Farias,José R.B.; Beneventi,Magda A.; Binneck,Eliseu; Fuganti,Renata; Stolf,Renata; Nepomuceno,Alexandre L.
Drought cause serious yield losses in soybean (Glycine max), roots being the first plant organ to detect the water-stress signals triggering defense mechanisms. We used two drought induction systems to identify genes differentially expressed in the roots of the drought-tolerant soybean cultivar MG/BR46 (Conquista) and characterize their expression levels during water deficit. Soybean plants grown in nutrient solution hydroponically and in sand-pots were submitted to water stress and gene expression analysis was conducted using the differential display (DD) and real time polymerase chain reaction (PCR) techniques. Three differentially expressed mRNA transcripts showed homology to the Antirrhinum majus basic helix-loop-helix transcription factor bHLH, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell division; Differential display; Gene expression; Real time PCR; Soybean; Water stress.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300019

Growth of sweet pepper plants submitted to water tensions in soil and potassium silicate doses
Provedor de dados: 75
Autores: Pereira,Alexandre Igor A; Guimarães,João de Jesus; Costa,João Victor; Cantuário,Fernando S de; Salomão,Leandro C; Oliveira,Roberta C de; Luz,José Magno Q.
ABSTRACT Water stress compromises plant growth. Resistance inducers, such as potassium silicate (K2SiO3), can reduce negative effects of this stress on Solanaceae, Capsicum annuum. Plant height, stem diameter and leaf area may indicate the efficiency of potassium silicate foliarsprayagainst water stress. The aim of this study was to evaluate the growth of sweet pepper plants under water stress and K2SiO3 doses. The experiment was conducted in randomized blocks in a split-plot scheme in space. The treatments consisted of four soil water stresses: 15 kPa (field capacity), 25 (intermediate value), 35 and 45 kPa (water stress) and three doses of potassium silicate (0, 0.4 and 0.8 L 100 L-1 water), acting as resistance inducers to water stress. The resistance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Solanaceae; Water stress; Silicon.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100082

Production, quality and water use efficiency of processing tomato as affected by the final irrigation timing
Provedor de dados: 75
Autores: Marouelli,Waldir A.; Silva,Washington L.C.; Moretti,Celso L.
A field study was conducted under "Cerrado" conditions of Brazil, during the dry season of 2000, to evaluate the effect of final irrigation timing on fruit yield, quality, and the use of water in processing tomatoes. Fourteen irrigation cut-off times were employed, 7 days apart, from blossom until harvest. Maximum marketable fruit yield took place when irrigations were cut-off 21 days before harvest (10% of red fruit). Total soluble solids content was linearly reduced at the rate of 0.34 ºBrix per each additional 10 days period of irrigation. Maximum pulp yield was obtained ending irrigation 34 days before harvest (20% of plants holding at least one red fruit). The highest tomato water use efficiency was observed when the last irrigation occurred between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Sprinkle irrigation; Water stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362004000200013

Impactos da deficiência hídrica e de altas temperaturas na produtividade da soja no estado do Paraná, safra 2018/2019.
Provedor de dados: 14
Autores: GONCALVES, S. L.
bitstream/item/202837/1/BOLETIM-de-PD-22.-online.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Soja; Deficiência Hídrica; Clima; Soybeans; Water stress.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1111884

WATER REQUIREMENTS AND WATER USE EFFICIENCY OF CARROT UNDER DRIP IRRIGATION IN A HAPLOXERAND SOIL
Provedor de dados: 126
Autores: Quezada,C; Fischer,S; Campos,J; Ardiles,D.
Water management efficiency is a key issue for sustainable agriculture development, since it is necessary to get a higher biomass production per unit of applied water. This study aimed to determine both water requirements and water use efficiency (WUE) and their effect on yield and quality parameters in carrots (Daucus carota L.), during the 2006 - 2007 growing season in Chilian, Chile (36° 35' 43.2" S, 72° 04' 39" W, 140 m altitude). The water treatments applied were 25, 50, 75, 100 and 125 % pan evaporation (Epan) in a Haploxerand soil under drip irrigation. The results showed that the highest crop yield was obtained with 100% Epan treatment. However, the highest WUE was found in the 75% Epan treatment equivalent to 3864 m³ ha-1, which is the recommended...
Tipo: Journal article
Palavras-chave: Water content; Roots quality; Water stress; Andisols.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100002

EFFECTIVENESS OF THE APPLICATION OF ARBUSCULAR MYCORRHIZA FUNGI AND ORGANIC AMENDMENTS TO IMPROVE SOIL QUALITY AND PLANT PERFORMANCE UNDER STRESS CONDITIONS
Provedor de dados: 126
Autores: Medina,Almudena; Azcón,Rosario.
Plant growth is limited in arid and/or contaminated sites due to the adverse conditions coming from heavy metal (HM) contamination and/or water stress. Moreover, soils from these areas are generally characterised by poor soil structure, low water-holding capacity, lack of organic matter and nutrient deficiency. In order to carry out a successful re-afforestation, it is necessary to improve soil quality and the ability of plants species to resist this harsh environment. The symbiosis with arbuscular mycorrhizal (AM) fungi has been proposed as one of the mechanisms of plant heavy metal tolerance and water stress avoidance. On the other hand, addition of organic amendments to the soil can reverse degradation of soil properties. Agro-waste residues such as dry...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhiza (AM); Fungi; Organic amendment; Heavy metal (HM) contamination; Water stress; Drought; Organic matter; Rock phosphate; Revegetation; Bioremediation; Aspergillus niger; Phosphate solubilization.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100009

Ctenarytaina spatulata, Taylor: soil water, mineral nutrients and their relations to eucalyptus dieback
Provedor de dados: 190
Autores: Santana, Dalva Luiz de Queiroz; Bellote, Antonio Francisco Jurado; Dedecek, Renato Antonio.
To develop this study it was used Eucalyptus grandis seedlings planted in three-liter pots, filled with soil collected on areas where dieback occurred (Arapoti, PR). The experiment consisted of six soil water level treatments, with and without insects. The experimental design was randomized blocks with 6 replications, arranged in six cages inside a green house. Three cages received insects and other three, not. The experiment consisted of the following treatments: 1. Sat. - soil water content maintained on the saturated conditions; 2. CC – soil water content maintained on field capacity; 3. 60 - humidity of the soil to 60% of the field capacity; 4. 30 - humidity of the soil to 30% of the field capacity; 5. A7 – soil water content maintained 7 days on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Dieback; Eucalyptus pests; Psyllidae Estresse hídrico; Pragas do eucalipto; Psyllidae; Entomologia.
Ano: 2003
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1618

Water stress before harvest of pepper-rosmarin
Provedor de dados: 86
Autores: Alvarenga,Ivan Caldeira Almeida; Valadares,Rafael Vasconcelos; Martins,Ernane Ronie; Oliveira,Flávio Gonçalves; Figueiredo,Lourdes Silva de; Kobayashi,Mauro Koji.
The objective of this work was to assess the effect of different periods of water stress before harvest of pepper-rosmarin (Lippia sidoides) on the contents of essential oil and flavonoids. The experiment was carried out during 270 days of cultivation, with drainage lysimeters, in a completely randomized block design with five treatments: 0, 2, 4, 6, and 8 days of water suppression before harvest, with four replicates. Fresh and dry matter yield, essential oil content, total flavonoids content, and water potential and temperature of leaves were determined. There was a decrease of approximately 50% in oil content and of 60% in total flavonoid content with the reduction of leaf water potential in 0.3 MPa. Essential oil is more sensitive to water stress than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lippia sidoides; Essential oil; Flavonoids; Leaf water potential; Medicinal plant; Water stress.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000700005

Germination of grasses and shrubs under various water stress and temperature conditions: (With 4 Figures &amp;amp; 2 Tables)
Provedor de dados: 85
Autores: Bonvissuto,GL; Busso,CA.
The effects of various temperature combinations and water potentials were determined on the germination of Atriplex lampa Gill. ex Moquin, Larrea divaricata Cav., Leymus erianthus (Phil.) Dubcovsky, Stipa neaei Nees ex Steudel and Poa ligularis Nees ap. Steudel under controlled conditions. The tested hypothesis was that seed germination increases with increasing temperatures and water potentials in A. lampa, L. divaricata, L. erianthus, S. neaei and P. ligularis, and that time to reach 50% of total germination is greater at lower than higher water potentials. PEG 2000 was used to impose water stress conditions. In general, obtained results conducted to accept the posted hyphotesis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Temperature; Germination index; Perennial grasses and shrubs; Arid Argentina.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100011

Biomass production and grain yield of three sorghum lines difering in drought resistance
Provedor de dados: 85
Autores: Castro-Nava,S; Ortiz-Cereceres,J; Mendoza-Castillo,M del C; Huerta,AJ.
The aim of this study was to determine the eficiency of drought classification criteria that we previously reported for our grain sorghum genotypes. Two tolerant genotypes of grain sorghum &amp;#091;Sorghum bicolor (L.) Moench&amp;#093; (UAT-124 and UAT-152) and one susceptible (UAT-30) were subjected to drought under greenhouse conditions at either panicle initiation, flag leaf, or flowering. Results showed that the effects of drought depended on when drought stress occurred during development. Biomass of the three sorghum genotypes was significantly reduced at the flag leaf stage (48%) by drought stress, but the greatest reduction occurred in the susceptible genotype UAT-30 (71%). Results showed that biomass accumulation for UAT-124 and UAT-30 was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor L. Moench; Water stress; Drought; Phenology; Biomass accumulation; Grain yield.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200002

Pitaya (Stenocereus stellatus) fruit growth is associated to wet season in Mexican dry tropic
Provedor de dados: 85
Autores: García-Suárez,F; Carreto-Montoya,L; Cárdenas-Navarro,R; Díaz-Pérez,JC; López-Gómez,R.
In this work we contribute to the knowledge of the reproductive phenology of Stenocereus stellatus (Pfeiffer,Riccobono), a columnar cactus that produces fruits of high commercial perspectives known as "pitayas". This kind of pitayas are produced for local commercialization in back orchards in some regions of the Mexican dry tropics. These fruits are produced only in the apical part of the cactus "arms". Our results show that fruit development of pitayas is highly associated to the rainy season of the year. This behavior is different from the reproductive strategy of other columnar cactus species that produce other kinds of pitaya in the same ecological region.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Columnar cacti; Pitaya fruit; Phenology; Water stress.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100002

Water stress and forage production in Tetrachne dregei Nees, Panicum coloratum L. and Eragrostis curvula (Schrad) Nees
Provedor de dados: 85
Autores: Ruiz,MA; Golberg,AD; Martínez,O.
Tetrachne dregei, Panicum coloratum and Eragrostis curvula are perennial forage C4 grasses, introduced from South Africa to the pampean semiarid region. This work was carried out to compare water stress tolerance; forage production and quality of T. dregei, P. coloratum and E. curvula. Studies were conducted under greenhouse and field conditions. In the greenhouse, watering was stopped after eighty one days of plant emergency in the water stress treatment. Water potential (&amp;#968;), stomatal resistance (SR) and shoot and root weights were evaluated. Under water stress, &amp;#968; diminished earlier and SR increases were higher in P. coloratum than in T. dregei and E. curvula. Plant survival in T. dregei and E. curvula was higher than that of P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tetrachne dregei; Panicum coloratum; Eragrostis curvula; Water stress; Forage production; Forage quality.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100002

Seedling growth response of Seriphidium quettense to water stress and non-water stress conditions
Provedor de dados: 85
Autores: Ahmad,S; Gul,S; Achakzai,AKK; Islam,M.
Seedling growth and development of Seriphidium quettense were examined under water stress (WS) and non-water stress (NWS) conditions. Seedlings were grown in pots to investigate their response to NWS conditions. Impact of WS on seedling growth was assessed in pre-existing plants grown under a semi-arid, natural environment. Seedling growth attributes were recorded on a monthly basis. Seedling growth exhibited a significant positive response under NWS conditions. Length of the main root axis at the first leaf emergence stage was 5.69 cm under NWS conditions; however, it was 4.8 cm in the natural environment (WS). At the end of the growing season, length of their primary root was 118 cm in NWS conditions. At the same time, it reached 8.8 cm in the WS natural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seriphidium quettense; Root and shoot growth; Water stress.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100004

Osmotic adjustment in Leymus cinereus cv. "Trailhead" under field conditions
Provedor de dados: 85
Autores: Torres,YA; Busso,CA; Montenegro,OA; Giorgetti,HD; Rodríguez,HD; Bentivegna,D.
Osmotic adjustment has been recognized to be an important adaptive response to water stress in higher plants. Although Leymus cinereus cv. "Trailhead" is reputedly a very drought-tolerant rangeland plant, its ability to adjust osmotically in the field has not previously been reported. This study examined the occurrence or not of osmotic adjustment in field-grown plants of Leymus cinereus cv. "Trailhead" during late spring in an arid zone of Patagonia. Plants of this species had been established in the field three years before. With this purpose, leaf laminae of this species were collected and pressure-volume curves made. Results showed turgor maintenance in the face of declining leaf water potentials (i.e., osmotic adjustment) in the study species. Even...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmotic adjustment; Leymus cinereus cv. "Trailhead"; Water stress; Patagonia.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200013

Influence of environmental factors on seed germination and seedling emergence of yellow sweet clover (Melilotus officinalis)
Provedor de dados: 87
Autores: Ghaderi-Far,F; Gherekhloo,J.; Alimagham,M.
Laboratory and greenhouse experiments were conducted to determine the effects of drought and salinity stress, temperature, pH and planting depth on yellow sweet clover (Melilotus officinalis) germination and emergence. Base, optimum and ceiling germination temperatures were estimated as 0, 18.47 and 34.60 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited at a potential of -1 MPa, but it was tolerant to salinity. Salinity stress up to 90 mM had no effect over the M. officinalis seed germination, but the germination decreased by increasing the salt concentration. The drought and salinity required for 50% inhibition of maximum germination were 207 mM and -0.49 MPa, respectively. High percentage of seed germination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; PH; Salinity stress; Soil depth; Temperature; Water stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300002

Water restriction, salinity and depth influence the germination and emergence of sourgrass
Provedor de dados: 87
Autores: Zambão,Jackson; v.H. Bittencourt,Henrique; T.S. Bonome,Lisandro; M. Trezzi,Michelangelo; C.P.P. Fernandes,Augusto.
Abstract  Background: Substantial losses to crops can occur due to the presence of sourgrass in agroecosystems, which is promoted by its seed dispersal ability. Environmental factors can affect sourgrass germination and emergence.  Objective: The objective of this study was to determine the effects of water restriction, salinity, and depth of sowing on the sourgrass germination and emergence processes.  Methods: Experiments using sourgrass seeds were conducted under controlled conditions simulating osmotic and saline stress and seeding depths. The data collected was submitted to analysis of variance and adjusted to models by regression analysis.  Results: Smaller osmotic potentials reduced germination, normal seedlings, and increased quiescence, with no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis; Water stress; Seeding depth.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100307

Germination ecology of wild onion: a rainfed crop weed
Provedor de dados: 87
Autores: Tanveer,A.; Sibtain,M.; Javaid,M.M.; Ali,H.H.
Asphodelus tenuifolius is becoming a more common weed in rain-fed area in Pakistan. Laboratory and greenhouse experiments were conducted to determine the effect of different environmental factors on germination and emergence of A.tenuifolius. Results showed that A.tenuifolius can tolerate a wide range of varying environmental factors. Greatest percentage of germination (80%) was recorded at 15 ºC constant temperature; however, considerable germination occurred at 20 and 25 ºC. Light for 10 h photoperiod stimulate germination of Asphodelus tenuifolius compared with complete darkness. Germination was totally inhibited at osmotic stress higher than -0.8 MPa. There was no significant difference in germination at pH 6 to 8; however, there was a slightly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asphodelus tenuifolius; Temperature; Water stress; Salt stress; PH; Seedling emergence; Seeding depth.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100008

Water management in the Yellow River Basin: Background, current critical issues and future research needs
Provedor de dados: 31
Autores: Giordano,   Mark; Zhu,   Zhongping; Cai,   Ximing; Hong,   Shangchi; Xue,   Yunpeng; Zhang,   Xuecheng.
Tipo: Report
Palavras-chave: River basin development; Water management; Water use; History; Water stress; Water scarcity; Flood water; Soil conservation; Policy; Water quality; Environmental effects; Water conservation; Irrigation water; Pollution control; Environmental Economics and Policy; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2004
URL: http://purl.umn.edu/92826

Agricultural water management in a water stressed catchment: lessons from the RIPARWIN project
Provedor de dados: 31
Autores: McCartney,   Matthew P.; Lankford,   Bruce A.; Mahoo,   Henry F.
With contributions from Julien Cour, Reuben Kadigi, Japhet Kashaigili, Magayane Machibya, Abraham Mehari, Sylvie Morardet, Kossa Rajabu, Charles Sokile, Siza Tumbo, Barbara van Koppen, Thalia Vounaki and Daniel Yawson
Tipo: Report
Palavras-chave: River basin management; Water stress; Irrigation programs; Irrigation management; Irrigation efficiency; Water use; Water allocation; Wetlands; Water rights; Water law; Economic aspects; Water rates; User charges; Water users associations; Decision support tools; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/37668

Efeitos da deficiência de água em plantas de Euterpe oleracea (açaí)
Provedor de dados: 88
Autores: CALBO,MARIA ELISA RIBEIRO; MORAES,JOSÉ ANTÔNIO P.V. DE.
A resistência de plantas jovens de açaí (Euterpe oleracea Mart.) à deficiência de água foi determinada em plantas de quatro meses de idade cultivadas em sacos plásticos perfurados contendo 7 kg de terra. O experimento foi conduzido em casa de vegetação e a irrigação foi suspensa até as plantas atingirem fotossíntese zero, quando, então, foram reidratadas. Durante este período foram feitas medidas diárias da fotossíntese líquida, condutância estomática e transpiração. Pequenas reduções na condutância estomática, transpiração e fotossíntese foram observadas a partir do décimo dia e se acentuaram com o tempo. A taxa de fotossíntese reduziu-se à metade da fotossíntese máxima quando o potencial de água atingiu -1,9 MPa. O estresse hídrico atingiu nível...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euterpe oleracea; Palms; Photosynthesis; Water stress.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000300001

Alteração no potencial osmótico e teor de carboidratos solúveis em plantas jovens de lobeira (Solanum lycocarpum St.-Hil.) em resposta ao estresse hídrico
Provedor de dados: 88
Autores: CHAVES FILHO,JALES TEIXEIRA; STACCIARINI-SERAPHIN,ELIANE.
Solanum lycocarpum é uma espécie típica da vegetação do cerrado brasileiro e tem demonstrado resistência à seca que ocorre em seu ambiente. O ajustamento osmótico é um decréscimo do potencial osmótico causado pelo acúmulo de solutos nas células, o qual mantém o gradiente de potencial hídrico e, ao mesmo tempo, a turgescência necessária ao crescimento celular. A influência do estresse hídrico no potencial osmótico e no teor de carboidratos solúveis foi investigada neste trabalho. A análise dos resultados mostrou que as plantas de Solanum lycocarpum apresentaram redução significativa nos valores de potencial osmótico em resposta ao estresse hídrico. O aumento no teor de carboidratos solúveis foi verificado em plantas sob condições estressantes em casa de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmotic adjustment; Water stress; "cerrado" vegetation; Savannah; Carbohydrate.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000200010

Transpiration Reduction Factor and Soybean Yield in Low Land Soil with Ridge and Chiseling
Provedor de dados: 90
Autores: Gubiani,Paulo Ivonir; Müller,Eduardo Augusto; Somavilla,André; Zwirtes,Anderson Luiz; Mulazzani,Rodrigo Pivoto; Marchesan,Enio.
ABSTRACT Water and oxygen deficiencies in the soybean crop cultivated on lowland soils are an important topic of research. The objective of this study was to investigate changes in water and oxygen supply and soybean yield caused by soil management in lowland soils. A soybean crop was grown under four soil conditions: no-tillage (NT), chiseling (CH), ridge tillage on no-tillage (NTR), and ridge tillage on chiseling (CHR). Soil bulk density, total porosity, macro- and microporosity, air permeability, and saturated hydraulic conductivity were measured at 0.05, 0.15, 0.25, and 0.35 m depths. Soil volumetric water content was monitored at the same depths every 30 min during the soybean cycle. The transpiration coefficient was calculated from volumetric water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Oxygen deficiency; Water table.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100414

Stem heat balance method to estimate transpiration of young orange and mango plants
Provedor de dados: 91
Autores: Vellame,Lucas M.; Coelho Filho,Maurício A.; Paz,Vital P. S.; Coelho,Eugênio F.
The present study had as its main objective the evaluation of the heat balance method in young orange and mango plants under protected environment. The work was carried out at Embrapa Cassava and Tropical Fruits, Cruz das Almas, BA. Later on, estimates of sap flow were conducted for two mango plants cultivated in pots of 15 and 50 L installed on weighting platforms of 45 and 140 kg; sap flow was determined in three orange plants, two of which were also installed on weighing platforms. The values of sap flow were compared to the transpiration measured by lysimeters at integrated intervals of 1, 2, 4 and 24 h. The heat balance method showed good precision for estimating daily transpiration (R² = 0.95 and R² = 0.90), accompaning the availability of energy in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sap flow; Lysimeters; Citrus; Water stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000600005

Soil water balance simulated by CROPGRO-Drybean model for edaphoclimatic conditions in Maringá
Provedor de dados: 91
Autores: Dallacort,Rivanildo; Freitas,Paulo S. L. de; Faria,Rogério T. de; Gonçalves,Antonio C. A.; Jácome,Aleksandra G.; Rezende,Roberto.
The performance of the CROPGRO-Drybeans model for the prediction of soil water balance, as well as growth components and bean crop yield, was assessed using data from two field experiments conducted at the State University of Maringá Irrigation Technical Center, Paraná - Brazil, (latitude 23º27'S, longitude 51º57' and altitude 542 m), during the 2005 and 2006 growing season. The model simulations correlated well with measured soil moisture (r &gt; 0.7) for both experiments. However, there were high discrepancies between measured and simulated soil moisture values on the days after rainfall. In addition, it was found that the model exaggerates the effect of water stress during the flowering phase, which leds to underprediction (19 and 29%) of crop yield.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Soil moisture; Simulation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000400002

Irrigation and organic fertilization on the production of essential oil and flavonoid in chamomile
Provedor de dados: 91
Autores: Aleman,Catariny C.; Marques,Patricia A. A.
ABSTRACT The therapeutic efficacy of herbal medicines and pesticides has increased the need to define cultivation parameters for medicinal plants. The objective of this study was to evaluate the production of essential oil and flavonoids of chamomile under irrigation levels and organic fertilizer doses. The experiment was conducted in the experimental area of the Campus II of the University of Western São Paulo, in the city of Presidente Prudente, SP, Brazil. The experimental design was a randomized block in triple factorial (6 x 2 x 3), corresponding to irrigation depths (150, 100, 75, 50, 25 and 0% of the reference evapotranspiration (ETo)), organic fertilizers (poultry manure and cattle manure) and the fertilizer doses (0, 3 and 5 kg m-2), with four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chamomilla recutita (L.) Rauschert; Medicinal plants; Water stress; Irrigation management; Organic production.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201045

Common bean yield under water suppression and application of osmoprotectants
Provedor de dados: 91
Autores: Bastos,Fabiano J. de C.; Soares,Frederico A. L.; Sousa,Camylla V.; Tavares,Cássio J.; Teixeira,Marconi B.; Sousa,Antonio E. C.
ABSTRACT The objective of this study was to evaluate the performance of the common bean crop grown with application of osmoprotectants based on algae of the genus Durvillaea potatorum in the winter crop season, with occurrence or not of water suppression. The experiment used a randomized block design, in split plots, arranged in a 4x7 factorial scheme, in which the plots were composed of four treatments - periods of water suppression (7, 14, 21 days and the control treatment: 100% of field capacity throughout the crop cycle) and the subplots consisted of seven types of osmoprotectants. The treatments with osmoprotectants was applied during the full flowering of the common bean. Three days after application of osmoprotectants, the treatments with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Durvillaea potatorum; Water stress; Yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800697

Response of four woody species to salinity and water deficit in initial growth phase
Provedor de dados: 91
Autores: Lima,Alan D.; Bezerra,Francisco M. S.; Neves,Antônia L. R.; Sousa,Carlos H. C. de; Lacerda,Claudivan F. de; Bezerra,Antônio M. E.
ABSTRACT The objective of this study was to evaluate the growth of forest species under conditions of salinity and water deficit. The experimental design was completely randomized in a triple factorial scheme with four forest species (Neem - Azadirachta indica A. Juss, ‘Aroeira’ - Myracrodruon urundeuva Fr Allemão, ‘Ipê’ - Tabebuia impetiginosa (Mart. ex. DC.) Standl and ‘Sabiá’ - Mimosa caesalpiniifoliaBenth), two salinity levels (1.2 and 8.6 dS m-1) and two water regimes (with and without water restriction). Plant height, stem diameter, number of leaves, shoot dry matter, root dry matter and total dry matter were measured. For all the studied variables, there was statistical significance for the factors species (A) and salinity (B), individually....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Native plants; Salt stress; Water stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100753

Nitrogen efficiency in wheat yield through the biopolymer hydrogel
Provedor de dados: 91
Autores: Mamann,Ângela T. W De; Silva,José A. G. da; Scremin,Osmar B.; Mantai,Rubia D.; Scremin,Ari H.; Dornelles,Eldair F.
ABSTRACT Nitrogen use efficiency in wheat biomass and grain yields can be favored by the biopolymer hydrogel. The objective of the study was to analyze the use of the biopolymer hydrogel applied to the seed in the optimization of fertilizer-N on wheat biomass and grain yields, under different conditions of agricultural year and succession systems of high and reduced release of residual-N. In the study, two experiments were conducted, with different farming systems, soybean/wheat and maize/wheat, one to quantify the biomass yield rate and the other to determine grain yield. The experiments were conducted in the years 2014 and 2015, in a randomized block design with four replicates in a 4 x 4 factorial scheme, corresponding to hydrogel doses (0, 30, 60 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Simulation; Farming systems; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000697

Yield and quality of sunflower oil in Ultisol and Oxisol under water regimes
Provedor de dados: 91
Autores: Loose,Luis H.; Heldwein,Arno B.; Silva,Jocélia R. da; Bortoluzzi,Mateus P.
ABSTRACT Extreme natural events influencing soil water availability are major factors limiting yield and oil quality in oilseed crops. The aim of the present study was to assess the effect of water deficit and surplus water on yield, oil content and on the fatty acid profile of sunflower plants sown in main and second crop seasons in two soil classes in Rio Grande do Sul State. The experiment was carried out in Santa Maria, RS (Ultisol) and Panambi, RS state, Brazil (Oxisol), Brazil, and comprised three water conditions (water deficit, water surplus and control) in a randomized block design. The hybrid Helio 250 was sown in early September (main crop season) and in early January (second crop season) in both soil classes. Yield, yield components, oil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Water stress; Fatty acids.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000700532

Water stress indices for the sugarcane crop on different irrigated surfaces
Provedor de dados: 91
Autores: Brunini,Rodrigo G.; Turco,José E. P.
ABSTRACT Sugarcane (Saccharum officinarum L.) is a crop of vital importance to Brazil, in the production of sugar and ethanol, power generation and raw materials for various purposes. Strategic information such as topography and canopy temperature can provide management technologies accessible to farmers. The objective of this study was to determine water stress indices for sugarcane in irrigated areas, with different exposures and slopes. The daily water stress index of the plants and the water potential in the soil were evaluated and the production system was analyzed. The experiment was carried out in an “Experimental Watershed”, using six surfaces, two horizontal and the other ones with 20 and 40% North and South exposure slopes. Water stress level was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Leaf temperature; Slope; Water and soil management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000925

Co-inoculation with Azospirillum brasilense in soybean cultivars subjected to water déficit
Provedor de dados: 91
Autores: Naoe,Alessandra M. de L.; Peluzio,Joênes M.; Campos,Leonardo J. M.; Naoe,Lucas K.; Silva,Roberta A. e.
ABSTRACT This study aimed to verify the effect of co-inoculation, association between Azospirillum brasilense and Bradyrhizobium japonicum bacteria, on soybean plants subjected to water deficit at two sowing dates. Two field experiments were conducted at the Universidade Federal de Tocantins, campus of Palmas, Brazil, in 2016. The experimental design was randomized blocks in a split-split-plot arrangement with four repetitions, where the plots consisted of two irrigation depths (100 and 25% of crop evapotranspiration - ETc), the subplots was composed of two methods of inoculant application (inoculation with Bradyrhizobium japonicum and co-inoculation with Azospirillum brasilense + Bradyrhizobium japonicum) and the sub-subplots comprised two soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Rhizobacteria; Water stress; Irrigation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000200089

ASSESSMENT OF CORN WATER UPTAKE BASED ON SAP HEAT TRACING UNDER WATER-STRESSED CONDITIONS
Provedor de dados: 91
Autores: Santos,Antonio Odair; Bergamaschi,Homero; Rosa,Luís M. G.; Bergonci,João I.; Radin,Bernadete.
ABSTRACT Crop water monitoring is an important aspect for precise control of irrigation. A reliable and movable technique is needed to properly assess water uptake of crops in the field. Water uptake by field grown maize ( Zea mays L.), in water-limited conditions was verified with the heat pulse system. The temperature difference between two radially inserted thermocouples, one 9 mm above and the other 4 mm below a heater piercing the maize stem, was measured every 0.3 sec following emission of a heat pulse in conditions of varied atmospheric demand. Comparisons of heat pulse system outputs and a high precision transpiration model estimates were done on hourly and daily basis, when low sap velocities were expected to occur. Hourly and daily basis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sap flow; Transpiration; Water stress; Heat pulse.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43661999000200145

Defoliation of sweet corn plants under irrigation depths and its impact on gas exchange
Provedor de dados: 91
Autores: Santos,Osvaldir F. dos; Lima,Sebastião F. de; Paiva Neto,Vespasiano B. de; Piati,Gabriel L.; Osório,Christian R. W. de S.; Souza,Hugo M. de.
ABSTRACT The objective of this work was to evaluate leaf gas exchanges of sweet corn as a function of defoliation when submitted to different irrigation depths. The experimental design was randomized blocks in split-plot scheme, with four irrigation depths in the plots [50, 75, 100 and 125% of crop evapotranspiration (ETc)], and three levels of defoliation in the subplots (0%, control; 35%, removal of four fully expanded leaves; 100%, total removal of the leaves - section of the aerial part) with three replicates. Defoliation was manually performed when the plant had four fully expanded leaves. It was verified that the dephs of irrigation and defoliation levels affect leaf gas exchanges in sweet corn plants, allowing the conclusion that the plant tends to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L. var. saccharata; Water stress; Photosynthesis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200822

Foliar gas exchange, fruit quality and water use efficiency of cape Gooseberry under different irrigation depths and mulching at greenhouse conditions
Provedor de dados: 94
Autores: Barbosa,Eduardo Augusto Agnellos; Ayub,Ricardo Antonio; Luz,Ângela da; Pessenti,Isabela Leticia; Pereira,André Belmont.
Abstract  The current study aimed at evaluating gas exchanges, yield, water use efficiency and fruit quality of cape gooseberry in response to different irrigation depths with or without mulching of oat residues on pots at greenhouse conditions. Four irrigation depths were tested: 50%, 100%, 125% e 150% of reference evapotranspiration (ETo). Leaf gas exchanges were evaluated by an infrared gas analyzer at different stages of the crop. Throughout the harvest, yield per plant and yield components were assessed in conjunction with water-use efficiency (WUE) and fruit quality responses. Stomata conductance at the flowering and fructification stages showed a smaller limitation under the treatments 125 and 150%ETo. It should be noticed that the aforementioned...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physalis peruviana L.; Water stress; Stomata conductance; Photosynthesis; Fruit yield.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000406001

EVALUATION OF GAS EXCHANGES IN DIFFERENT Prunus SPP. ROOTSTOCKS UNDER DROUGHT AND FLOODING STRESS
Provedor de dados: 94
Autores: KLUMB,ELSA KUHN; RICKES,LETICIA NEUTZLING; BRAGA,EUGENIA JACIRA BOLACEL; BIANCHI,VALMOR JOÃO.
ABSTRACT  The state of Rio Grande do Sul is the largest peach productor in Brazil; however, it still possesses poor yield values when compared with other states. One of the problems associated with this is the occurrence of soils with drainage problems, mainly in Pelotas region, which depending on the year period, may undergo water deficit or flooding situations in the great majority of the years, which harm the crop development and yield. Among the harmful effects caused by these stresses stand out, the decrease in the net assimilation rate, closure of stomata, reduction of the cell activities, production of reactive oxygen species, membrane and protein destabilization. Thus, the aim of this study was to investigate in what magnitude of the gaseous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Photosynthesis; Peach tree; Plum tree.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000400706

Incidence of green soybean seeds as a function of environmental stresses during seed maturation
Provedor de dados: 95
Autores: Pádua,Gilda Pizzolante De; França-Neto,José De Barros; Carvalho,Maria Laene Moreira De; Krzyzanowski,Francisco Carlos; Guimarães,Renato Mendes.
Hot and dry weather conditions during soybean [Glycine max (L.) Merrill] seed maturation can cause forced maturation of the seed, resulting in the production of high levels of green seed, which may be detrimental to seed germination. These stressful conditions were imposed on soybean plants during seed maturation to investigate the production of green seeds and seed quality. Plants of the CD 206 cultivar were grown in a greenhouse until the R5.5 growing stage and then transferred to phytotrons at R6 and R7.2 for stress induction. Plants were subjected to two temperature regimes, high (28ºC to 36ºC) and normal (19ºC to 26ºC), and four soil water availability conditions, control (adequate water supply), 30% gravimetric moisture (GM), 20% GM and no water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Seed quality; Temperature stress; Water stress.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000300017

Heliotropism and water availability effects on flowering dynamics and seed production in Macroptilium lathyroides
Provedor de dados: 95
Autores: Santos,Armando Martins dos; Rosa,Luis Mauro Gonçalves; Franke,Lucia Brandão; Nabinger,Carlos.
The experiment was carried out in pots in a glasshouse, with one plant per pot and nine repetitions per treatment. The treatments consisted of free or restricted leaves, submited to 90-100% or 60-70% soil field capacity (FC). Only independent effects of water availability or leaf movement were observed on yield components. Plants under well-watered conditions and with freely orienting leaves were taller, and had a larger number of ramifications. The greater development favored the setting of a higher number of inflorescences per plant in these treatments. This behavior resulted in a high number of flowers, green and mature legumes per plant, thus resulting in high seed production which was the most evident response to water availability. Although...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Leaf movements; Phasey bean; Flowers production.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222006000200006

Phenotypic response of Lycopersicon chilense to water deficit
Provedor de dados: 97
Autores: MALDONADO,CARLOS; SQUEO,FRANCISCO A; IBACACHE,ERIC.
ABSTRACT Environmental-induced phenotypic variation in plants is often considered to be a functional response that maximizes fitness in heterogeneous environments. Lycopersicon chilense, a tomato species endemic to Atacama Desert, shows altitudinal phenotypics variations in their natural environments, which could be due to different soil water availabilities. It is hypothesized that (a) seeds coming from populations of different environments, cultivated in the same environment, will have similar phenotypes, if populations are not genetically differentiated, and that (b) the different populations subjected to two drought levels should vary their phenotypic constitution with respect to the control groups. The responses of twenty phenotypic traits to...
Tipo: Journal article
Palavras-chave: Phenotypic response; Water stress; Physiological adjustment; Self-organization; Wild tomato.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100012

Growth and gas exchange in cowpea plants under different managements and saline conditions
Provedor de dados: 124
Autores: Silva,Weslley Costa; Moura,Joana Gomes de; Oliveira,Alexandre Bosco de; Ferreira,Leonardo Elias; Silva,Tatiana Maria da.
ABSTRACT The cowpea is one of the main crops of economic and social importance in the northeast of Brazil. However, the growing need to increase crop yield has prompted the use of irrigation water with high levels of salts. The aim of this study therefore, was to evaluate the effects of different irrigation depths and rates of liquid biofertilizer on growth and gas exchange in cowpea plants under saline conditions. The experiment was conducted in a randomized block design, using a scheme of split lots consisting of four irrigation depths with saline water (75, 100, 125 and 150% of crop evapotranspiration - ETc) and sub-lots of four different doses of biofertilizer (0; 5,000; 10,000 and 15,000 L ha-1). At 75 days after sowing (DAS), readings were taken of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata (L.) Walp; Water stress; Organic matter.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500756

Physiological changes in eucalyptus hybrids under different irrigation regimes
Provedor de dados: 124
Autores: Valadares,Jane; Paula,Nádia Figueiredo de; Paula,Rinaldo Cesar de.
With the expansion of the cultivation of eucalyptus into areas with limited water resources, recommending genotypes which are tolerant to low water availability is important in order to maximize productivity under such conditions. The aim of this work therefore was to evaluate five hybrids of Eucalyptus grandis x E. urophylla (H1 to H5) subjected to four irrigation regimes in the greenhouse: daily (IR1), every two days (IR2), every four days (IR4) and every six days (IR6). The following characteristics were evaluated: photosynthetic rate (A), transpiration (E), stomatal conductance (g s), leaf water potential (Ψw), leaf relative water content, photochemical efficiency and chlorophyll content index. Evaluations of A, g s and E were carried out on two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Forest improvement; Physiological characteristics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400019

Chemical composition of Panicum maximum ‘BRS Zuri’ subjected to levels of salinity and irrigation depths
Provedor de dados: 124
Autores: Silva,Eranildo Brasil da; Carneiro,Maria Socorro de Souza; Furtado,Rafael Nogueira; Lopes,Marcos Neves; Braga,Marilena de Melo.
ABSTRACT The study of cultivars with moderate flood tolerance is essential to their use in pastures irrigated with saline water. The aim of this study was to evaluate the chemical composition of Panicum maximum ‘BRS Zuri’ under the effect of different irrigation depths and levels of salinity. A randomised block design of split plots was used with five replications per treatment. The treatments resulted from the combination of three levels of water salinity (S1 = 0.6, S2 = 1.8 and S3 = 3.0 dS m-1) and four levels of irrigation (I1 = 60%, I2 = 80%, I3 = 100% and I4 = 120% of the evapotranspiration). The chemical composition of the grass, Panicum maximum ‘BRS Zuri’, cut at 28 days, was evaluated over two cycles. There was an interaction between the factors...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saline water; Water stress; Dry matter; Pasture.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100416

Sugarcane leaf area index modeling under different soil water conditions
Provedor de dados: 63
Autores: Teruel,D.A.; Barbieri,V.; Ferraro Jr.,L.A.
The knowledge of the Leaf Area Index (LAI) variation during the whole crop cycle is essential to the modeling of the plant growth and development and, consequently, of the crop yield. Sugarcane LAI evolution models were developed for different crop cycles, by adjusting observed LAI values and growing degree-days summation data on a power-exponential function. The resultant equations simulate adequately the LAI behavior during the entire crop cycle. The effect of different water stress levels was calculated in different growth periods, upon the LAI growth The LAI growth deficit was correlated with the ratio between actual evapotranspiration and máximum evapotranspiration, and a constant named kuu was obtained hi each situation. It was noticed that the kLAI...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf Area Index; Sugarcane; Growing degree-days; Water stress; Modeling.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300008

Stomatal behavior and components of the antioxidative system in coffee plants under water stress
Provedor de dados: 63
Autores: Deuner,Sidnei; Alves,José Donizeti; Zanandrea,Ilisandra; Goulart,Patrícia de Fátima Pereira; Silveira,Neidiquele Maria; Henrique,Paôla de Castro; Mesquita,Alessandro Carlos.
Coffee (Coffea arabica) plants show a positive relationship between stomatal closure and formation and accumulation of H2O2. However, for coffee plants under water restriction such relationship has never been studied. The objective of the present study was evaluate the stomatal movement and the antioxidant capacity of coffee seedlings under different water regimes. Eight months old coffee seedlings of cv. Catuaí IAC 99 were submitted to field capacity, gradual and total suspension of irrigation during a period of 21 days. Evaluations of leaf water potential (Ψw) were performed in the beginning of the morning, and stomatal resistance, transpiration rate and vapor pressure deficit were determined at 10 am and 5 pm. All biochemical and enzymatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Oxidative stress; Antioxidants; Water stress.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100012

Deficit irrigation at different growth stages of the common bean (Phaseolus vulgaris L., cv. Imbabello)
Provedor de dados: 63
Autores: Calvache,M.; Reichardt,K; Bacchi,O.O.S.; Dourado-Neto,D.
To identify specific growth stages of the common bean crop at which the plant is less sensitive to water stress, in which irrigation could be omitted without significant decrease hi final yield, two field experiments were conducted at "La Tola" University Experimental Station, Tumbaco, Pichincha, Ecuador, on a sandy loam soil (Typic Haplustoll). The climate is tempered and dry (mean air temperature 16°C and mean relative humidity 74%, during the cropping season) 123 and 109 mm of rainfall were recorded during the experimental cropping periods (July to October), of 1992 and 1994, respectively. The treatments consisted of combinations of 7 irrigation regimes including normal watering; full stress; (traditional management practice); single stress at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Irrigation; Water stress; Water use efficiency.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300002

Dynamic systems approach assess and manage water resources in river basins
Provedor de dados: 63
Autores: Sánchez-Román,Rodrigo Máximo; Folegatti,Marcos Vinicius; Orellana González,Alba María Guadalupe; Silva,Rogério Teixeira da.
The Piracicaba, Capivari and Jundiaí River Basins (RB-PCJ) are located in the States of Minas Gerais and São Paulo, Brazil. By 2005, 5.8% of Brazil's General National Product-GNP was produced there. Such economic development has created a huge demand for water resources. The availability of water resources was assessed by running a dynamic systems simulation model to manage these resources in the RB-PCJ (WRM-PCJ), considering five 50-year simulations. WRM-PCJ was developed as a tool to aid the RB-PCJ Watershed Committee. The model computes water supply, demands, and contamination load from several consumers. When considering a Business-as-Usual scenario, by 2054, water demands will have increased up to 76%, 39% of the available water will come from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Water management; Watershed; Modeling.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400001

Application of the Hybrid-Maize model for limits to maize productivity analysis in a semiarid environment
Provedor de dados: 63
Autores: Liu,Yi; Yang,Shenjiao; Li,Shiqing; Chen,Fang.
Effects of meteorological variables on crop production can be evaluated using various models. We have evaluated the ability of the Hybrid-Maize model to simulate growth, development and grain yield of maize (Zea mays L.) cultivated on the Loess Plateau, China, and applied it to assess effects of meteorological variations on the performance of maize under rain-fed and irrigated conditions. The model was calibrated and evaluated with data obtained from field experiments performed in 2007 and 2008, then applied to yield determinants using daily weather data for 2005-2009, in simulations under both rain-fed and irrigated conditions. The model accurately simulated Leaf Area Index , biomass, and soil water data from the field experiments in both years, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop simulation; Maize model; Potential productivity; Water stress; Spring maize.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500003

Electrical conductivity of the seed soaking solution and soybean seedling emergence
Provedor de dados: 63
Autores: Vieira,Roberval Daiton; Scappa Neto,Angelo; Bittencourt,Sonia Regina Mudrovitsch de; Panobianco,Maristela.
Vigor of soybean [Glycine max (L.) Merrill] seeds can be evaluated by measuring the electrical conductivity (EC) of the seed soaking solution, which has shown a satisfactory relationship with field seedling emergence, but has not had aproper definition of range yet. This work studies the relationship between EC and soybean seedling emergence both in the field and laboratory conditions, using twenty two seed lots. Seed water content, standard germination and vigor (EC, accelerated aging and cold tests) were evaluated under laboratory conditions using -0.03; -0.20; -0.40 and -0.60 MPa matric potentials, and field seedling emergence was also observed. There was direct relationship between EC and field seedling emergence (FE). Under laboratory conditions, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Vigor; Physiological quality; Water stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200007

Silicon accumulation and water deficit tolerance in Brachiaria grasses
Provedor de dados: 63
Autores: Melo,Suzana Pereira de; Korndörfer,Gaspar Henrique; Korndörfer,Clotilde Maria; Lana,Regina Maria Quintão; Santana,Denise Garcia de.
The beneficial effects of silicon (Si) fertilization have been observed for several plant species, especially when submitted to stress, either biotic or abiotic. Among the possible reasons for the greater adaptability and resistance of brachiaria grass in areas of low fertility soils in Brazilian savanna, stands its capacity of absorbing and accumulating Si in aerial parts. To evaluate the effect of Si on dry matter yield of Brachiaria decumbens Stapf and Brachiaria brizantha Hochst, grown under two soil moisture regimes, a trial was set up in a completely randomized design factorial scheme (5 × 2 × 2), with five Si rates: (0; 242; 484; 968 and 1,452 kg ha-1), two soil water tensions (60% and 80% of field capacity) and the two brachiaria species. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium silicate; Pasture; Water stress; Soil moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400022

Yield components as indicators of drought tolerance of sugarcane
Provedor de dados: 63
Autores: Silva,Marcelo de Almeida; Silva,Jorge Alberto Gonçalves da; Enciso,Juan; Sharma,Vivek; Jifon,John.
Water deficit is one of the major factors limiting the production of sugarcane (Saccharum officinarum L.). A study of the effects of limited water condition on yield components and their relationship with productivity can aid breeding programs in selecting for high yielding genotypes under this condition. The objective of this study was to investigate the relationships among the parameters stalk number, stalk height, stalk diameter, and stalk weight with cane yield in sugarcane growing in a field under moderate water stress during its grand growth period, in order to provide information to help breeders in adopting traits for selecting drought tolerant varieties. Seventy-eight genotypes plus two controls, one drought-tolerant and one drought-susceptible,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Biometric attributes; Productivity; Water stress; Genotypes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600008

Least limiting water range for oil palm production in Amazon region, Brazil
Provedor de dados: 63
Autores: Sato,Michel Keisuke; Lima,Herdjania Veras de; Ferreira,Raphael Leone da Cruz; Rodrigues,Sueli; Silva,Álvaro Pires da.
ABSTRACT In areas cultivated with oil palm, typically mechanized field operations using heavy vehicles may negatively affect soil physical properties and productivity. The aim of this study was to evaluate soil physical quality in an area cultivated with oil palm by monitoring the temporal variation of the soil water content and relating it to the critical limits of the least limiting water range. Soil bulk density (Bd), soil penetration resistance (SR), least limiting water range (LLWR), and water stress days (WSD) were used to assess soil physical quality in planting rows (PR) and the traffic zone (TZ) at depths 0-20, 20-40, and 40-60 cm. The Bd was higher and the LLWR was reduced in TZ only at the surface layer. The effect of temporal variation in soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elaeis guineensis Jacq; Soil physical quality; Soil compaction; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200148

งานวิจัยการผลิตข้าวโพดประจำปี 1984
Provedor de dados: 106
Autores: Supot Faungfupong; Pipat Weerathaworn; Somchai Piyapantavanon; Kunya Chaupun; Punnipa Phrachya; Porn Rungchang.
4 tables
Palavras-chave: Corn; Maize; Production; Seed bed preparation; Fertilizers; Weeds; Aflatoxins; Water stress; ข้าวโพด; การผลิต; การเตรียมดิน; ปุ๋ย; วัชพืช; การขาดน้ำ; อะฟลาทอกซิน.
Ano: 1984
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4466

Corn downy mildew program
Provedor de dados: 106
Autores: Renfro, B.L.; Narong Singburaudom; Singh, Jaswant; Bhat, S. Shankara.
13 tables
Palavras-chave: Corn; Maize; Downy mildew; Peronosclerospora sorghi; Varieties; Disease resistance; Infection; Plant density; Nitrogen fertilizers; Phosphate fertilizers; Water stress; Yields; ข้าวโพด; โรคราน้ำค้าง.
Ano: 1977
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3933

Effect of soil water availability on gas exchange in young trees of Eucalyptus grandis W. Hill ex Maiden
Provedor de dados: 109
Autores: Mejía-de Tafur,María Sara; Riaño-Herrera,Néstor Miguel; Urrego-Mesa,John Byron; Ibarra-Espinosa,Dora Mónica; Zapata-Duque,Claudia Marcela.
Abstract Two outdoor trials were conducted in the department of Valle del Cauca, Colombia, in contrasting climatic conditions, to evaluate the effect of soil water availability on the gas exchange of four elite genotypes of Eucalyptus grandis as follows: 28-3, 18-3, 24A-5 and 19-1, respectively. One trial was conducted on the campus of the Universidad Nacional de Colombia located in Palmira, at 994 m.a.s.l. with an average temperature of 23.5°C (maximum of 31°C, minimum of 18°C), and 76% relative humidity (RH). The second trial was conducted at the nursery of Carton de Colombia S.A., located in Restrepo, at 1450 m.a.s.l. with an average temperature 18°C (maximum of 26°C, minimum of 12°C) and 80% RH. A split-plot design with four replicates was used....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Waterlogging; Stomatal conductance; Photosynthesis; Transpiration.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400549

Growth and carbon assimilation limitations in Ricinus communis (Euphorbiaceae) under soil water stress conditions
Provedor de dados: 39
Autores: Sausen,Tanise Luisa; Rosa,Luís Mauro Gonçalves.
Water availability may influence plant carbon gain and growth, with large impacts on plant yield. Ricinus communis (L.), a drought resistant species, is a crop with increasing economic importance in Brazil, due to its use in chemical industry and for the production of biofuels. Some of the mechanisms involved in this drought resistance were analyzed in this study by imposing progressive water stress to pot-grown plants under glasshouse conditions. Water withholding for 53 days decreased soil water gravimetric content and the leaf water potential. Plant growth was negatively and significantly reduced by increasing soil water deficits. With irrigation suspension, carbon assimilation and transpiration were reduced and remained mostly constant throughout the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: A/Ci curves; Diurnal changes; Photosynthesis; Stomatal limitations; Water stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000300008

Variation in plant defenses of Didymopanax vinosum (Cham. &amp;amp; Schltdl.) Seem. (Apiaceae) across a vegetation gradient in a Brazilian cerrado
Provedor de dados: 39
Autores: Pais,Mara Patrícia; Varanda,Elenice Mouro.
Cerrado vegetation is composed of a mosaic of vegetation types, from campo sujo, dominated by herbs; campo cerrado and cerrado sensu stricto, with shrubby vegetation; to cerradão, with trees forming a denser forest. This physiognomic mosaic is related to differences in the water availability in the soil. Cerrado plants are considered physically and chemically well defended against herbivores, but there are no studies showing how plants allocate investment to various types of defensive mechanisms in different habitat physiognomies. The defensive mechanisms and the nutritional traits of a cerrado plant, Didymopanax vinosum (Cham. &amp;amp; Schltdl.) Seem. (Apiaceae), were compared along a vegetation gradient. Toughness, as well as water, nitrogen, cellulose,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Plant defenses; Tannins; Vegetation gradient; Water stress.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000300007

Anatomical and morphological modifications in response to flooding by six Cerrado tree species
Provedor de dados: 39
Autores: Oliveira,Adilson Serafim de; Ferreira,Cristiane Silva; Graciano-Ribeiro,Dalva; Franco,Augusto César.
Wetlands are common in the Cerrado (Brazilian savannas) biome, however flooding of these wetlands impairs growth and development of most plants. We evaluated flood tolerance of typical Cerrado trees. Seedlings of Aspidosperma macrocarpon (Apocynaceae), Tabebuia rosea (Bignoniaceae), Handroanthus chrysotrichus (Bignoniaceae), Myracrodruon urundeuva (Anacardiaceae), Kielmeyera coriacea (Calophyllaceae) and Copaifera langsdorffii (Fabaceae) were flooded up to the stem base for 30 days. Stems with cortical cracks, secondary aerenchyma and hypertrophic lenticels were observed in flooded plants of M. urundeuva,H. chrysotrichus and T. rosea while adventitious roots were formed in flooded plants of T. rosea and H. chrysotrichus. However, only T. rosea developed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerenchyma; Biomass partitioning; Flood tolerance; Hypoxia; Water stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400478

Structural features of species of Asteraceae that arouse discussions about adaptation to seasonally dry environments of the Neotropics
Provedor de dados: 39
Autores: Ferraro,Alexandre; Scremin-Dias,Edna.
ABSTRACT Seasonally-dry environments of the Neotropics, such as the South American Chaco, exert selective pressures on vegetation through a pronounced water deficit. We describe the underground system and leaf anatomy of three species of Asteraceae from the Brazilian portion of the Chaco (Pterocaulon purpurascens Malme, Wedelia trichostephia DC., and Pectis gardneri Baker), aiming to describe their structural and adaptive features using standard plant anatomy techniques. Pterocaulon purpurascens and W. trichostephia exhibited slightly thickened xylopodia, with gemmiferous character and self-grafted stem shoots; Pectis gardneri displayed a slightly-thickened tuberous root with storage substances. Longitudinal sequences of cells with highly thickened walls...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteroideae; Drought; Steppic savanna; Underground systems; Water stress; Xylopodia.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100113

Effect of water stress on seedling growth in two species with different abundances: the importance of Stress Resistance Syndrome in seasonally dry tropical forest
Provedor de dados: 39
Autores: Ferreira,Wanessa Nepomuceno; Lacerda,Claudivan Feitosa de; Costa,Rafael Carvalho da; Medeiros Filho,Sebastião.
ABSTRACTIn seasonally dry tropical forests, species carrying attributes of Stress Resistance Syndrome (SRS) may have ecological advantages over species demanding high quantities of resources. In such forests, Poincianella bracteosa is abundant, while Libidibia ferrea has low abundance; therefore, we hypothesized that P. bracteosa has characteristics of low-resource species, while L. ferrea has characteristics of high-resource species. To test this hypothesis, we assessed morphological and physiological traits of seedlings of these species under different water regimes (100%, 70%, 40%, and 10% field capacity) over 85 days. For most of the studied variables we observed significant decreases with increasing water stress, and these reductions were greater in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; High-resource species; Libidibia ferrea; Low-resource species; Morphological traits; Physiological traits; Poincianella bracteosa; Stress Resistance Syndrome; Water stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300375

Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought
Provedor de dados: 39
Autores: Rosa,Bruno Luan; Souza,João Paulo; Pereira,Eduardo Gusmão.
ABSTRACT Water availability is the main factor that explains current patterns of palm abundance. However, the interaction between water stress and increasing atmospheric CO2 concentrations caused by climatic change and its effects on palm physiology remain poorly known. Macauba palm is a widespread Neotropical species commonly found in ecosystems subjected to seasonal drought and has potential use in oil production. The present work investigated the influence of increased CO2 concentrations on photosynthetic responses to drought in macauba palm plants. Exposure to increased CO2 concentrations led to up-regulation of photosynthesis through higher stomatal conductance and improved light and water use efficiency. Macauba palm plants under water stress,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Photosynthesis; Palm; Water stress; Water use efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300486

Chitosan application in the induction of water deficit tolerance in maize plants
Provedor de dados: 1
Autores: Almeida, Lorena Gabriela; Magalhães, Paulo César; Karam, Décio; Silva, Eder Marcos da; Alvarenga, Amauri Alves.
The present research seeks to elucidate the feasibility of chitosan (CHT) in the induction of water deficit tolerance in different maize hybrids, contrasting tolerance to water restriction, tolerance and sensitivity. The maize plants were subjected to water deficit and foliar application of different chitosan doses (60, 100, 140, and 180 mg L-1) at the pre-flowering growth stage and evaluated during the stress period of fifteen days. To understand the induction behaviour of the tolerance to water restriction, biophysical parameters, such as water potential, relative water content and chlorophyll content, gas exchange, and biochemical assays, were quantified based on the activity of SOD, CAT, APX, and PAL antioxidant enzymes, lipid peroxidation activity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiperspirant; Antioxidant enzymes; Water stress; Gas exchange.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42463

Avaliação de cultivares de soja quanto à tolerância ao estresse hídrico em substrato contendo polietileno glicol - DOI: 10.4025/actasciagron.v30i2.1731
Provedor de dados: 1
Autores: Texeira, Leandra Regina; UEM; Braccini, Alessandro de Lucca e; UEM; Sperandio, Decio; UEM; Scapim, Carlos Alberto; UEM; Schuster, Ivan; Cooperativa Central de Pesquisa Agricola; Viganó, Joselaine; UEM.
O trabalho teve por objetivo avaliar genótipos de soja quanto à tolerância ao estresse hídrico, em substrato embebido com polietileno glicol (PEG 6000). Foram utilizadas sementes armazenadas por um ano, em condições não-controladas de laboratório das cultivares: CD 201, CD 202, CD 204, CD 205, CD 206, CD 208, CD 215, CD 216, Embrapa 48, BRS 132, BRS 184 e BRS 212. As avaliações consistiram em submeter às sementes aos testes de germinação, classificação do vigor das plântulas, comprimento e biomassa seca das plântulas, em condição de estresse hídrico, utilizando dois níveis de potencial osmótico (zero e -0,1 MPa). As cultivares foram agrupadas em diferentes classes de tolerância à seca, em razão da redução percentual nas características avaliadas {% Redução...
Palavras-chave: 5.01.03.05-9    Melhoramento Vegetal Glycine max (L.) Merrill; Sementes; Potencial osmótico; Germinação; Estresse hídrico 5.01.03.05-9    Melhoramento Vegetal Glycine max (L.) Merrill; Seeds; Osmotic potential; Germination; Water stress.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1731

Productivity of the common bean in conditions of irrigation with deficit
Provedor de dados: 111
Autores: Carvalho, José Joaquim; Saad, João Carlos Cury; Teixeira, Marconi Batista; Soares, Frederico Antonio Loureiro; Silva, Nelmício Furtado da; Campos, Melissa Selaysim Di; Cunha, Fernando Nobre; Santos, Leonardo Nazário Silva dos.
Historically cultivated by small farmers, bean crops are now cultivated with varied levels of technology, including practices such as irrigation and direct sowing, as well as the soil management and traditional practices to increase productivity. Along with the adoption of these techniques, an increase in the usage of irrigation has occurred, which purports to meet the water requirements of the crop throughout its life cycle. The main objective of this work was to study the effects of different irrigation depths during two phases of the bean crop cycle and the behavior of cv. IAC-Alvorada during winter in the first and second year of direct sowing in Botucatu – SP, a southeastern region of Brazil. The experimental soil area is classified as a red...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus Vulgaris L.; Red distroferric nitosol; Water stress; Water use efficiency.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4678

Zeolite and selenium application and their effects on production and physiological attributes of canola cultivars under water stress
Provedor de dados: 115
Autores: Zahedi,Hossein; Shirani-Rad,A. Hossein; Tohidi-Moghadam,H. Reza.
To study the effects of zeolite and selenium (Se) application on production and physiological attributes of three canola (Brassica napus L.) cultivars under water stress, an experiment was conducted in two growing seasons (2006 and 2007), at Karaj, Iran. The experimental design was randomized complete blocks in factorial split plot with three replications, and three factors: 1) irrigation: complete and restricted at stem elongation stage; 2) zeolite: 0 and 10 t ha-1; 3) Se (as sodium selenate): 0, 15 and 30 g L-1. These treatments were randomized into Zarfam, Okapi and Sarigol canola cultivars. According to the results, Zarfam cultivar showed the lowest electrolyte leakage and the highest biological yield due to zeolite application and 30 g L-1 Se. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological yield; Brassica napus L.; Water stress; Cellular electrolyte leakage; Selenium; Zeolite.
Ano: 2012
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952012000500006

Water relations and photosynthesis of young coffee plants under two water regimes and different N and K doses
Provedor de dados: 115
Autores: Andrade,Marcela A. Frois de; Cairo,Paulo A. Ramos; Santos,Jerffson L.
Nitrogen (N) and potassium (K) are the major nutrients required for coffee plants growth and development. Soil water deficit reduces nutrients uptake, causing negative effects on photosynthesis and water relations of plants. Within certain limits, the increase in N and K concentration in soil solution could result in higher nutrient uptake, softening physiological disturbs caused by the water deficit. This study aimed to evaluate water relations and photosynthesis of young coffee plants grown in 16 L pots in a greenhouse. Treatments were three N and three K doses: conventional (urea 12 g plant-1 and KCl 4 g plant-1), doubled and tripled; and two water regimes: irrigated (soil at field capacity) and non-irrigated. Thus, treatments were arranged in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Water stress; Mineral nutrition.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000200004

Response of Tunisian durum (Triticum turgidum ssp. durum) and bread (Triticum aestivum L.) wheats to water stress
Provedor de dados: 115
Autores: Ayed,Sourour; Rezgui,Mohsen; Othmani,Afef; Rezgui,Mounir; Trad,Hiba; Silva,Jaime A. Teixeira-da; Ben Younes,Mongi; Ben Salah,Hamadi; Kharrat,Mohamed.
Abstract Wheat is a staple crop in Tunisia, but little is known about the response of Tunisian durum wheat (Triticum turgidumssp.durum) and bread wheat (Triticum aestivum L.) to water stress. In semi-arid regions, where cereals are concentrated, grain yield is subject to water deficit especially due to variability in rainfall. Therefore, the objective of this study was to evaluate the response to water stress of three durum wheat (Mâali, Nasr and Salim) and two bread wheat (Tahent and Utique) varieties. The experimental design was a complete randomized block, water treatments were rainfed conditions (T0) and irrigation applied at the tillering and flowering stages (T1, control) with three replications per treatment, and data was analyzed by ANOVA and Tukey...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Durum wheat; Bread wheat; Grain yield; Yield components.
Ano: 2017
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952017000100013

Germination of Styrax camporum Pohl. seeds in response to substrate types, moisture contents and the seed morphology
Provedor de dados: 42
Autores: Simão,Edson; Nakamura,Adriana T.; Takaki,Massanori.
This study evaluated the contributions of Styrax camporum seed morphology (size of seeds, presence or absence of endocarp attached to the seed), different substrates (filter paper, vermiculite, sand and the soils of cerrado s. str., cerradão and a riparian forest), different water potentials (0, -0.1, -0.2, -0.3, -0.4 and -0.5 MPa), light and temperature to seed germination. Seed size did not affect the germination percentage when seeds were sown on vermiculite. Seeds were affected by small variations in the moisture content of the tested substrates, showing a significant decrease in germination under water potentials lower than -0.1 MPa, close to the field capacity of cerrado s. str. soils. At the temperatures of 15 and 20°C, a significant decrease in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Water stress; Morphophysiology; Styracaceae; Vermiculite.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100295

Light environment influences the flood tolerance in Cordia americana (L.) Gottschling &amp;amp; J.S.Mill.
Provedor de dados: 42
Autores: SAMOJEDEN,CAROLINE G.; ARTUSI,ÁGHATA C.; DELEVATTI,HELIUR A.A.; MILESI,SILVIA V.; CANSIAN,ROGÉRIO L.; KISSMANN,CAMILA; SAUSEN,TANISE L.
Abstract The subtropical riverine forests present a variation in soil water availability throughout the year, following precipitation seasonality. The objective of this work was to evaluate the responses of Cordia americana to different light intensities combined with soil flooding. Seedlings were acclimated to light treatments, with full sun and shade conditions. Sun and shade plants were subjected to soil flooding during periods of 10 (short) and 30 (longer) days. After 10 days, flooded plants had a higher root dry mass accumulation and soluble sugars content, regardless of the light condition. Shade plants presented higher shoot soluble sugars content in relation to the sun plants. After 30 days, a higher shoot soluble sugar content was observed in sun...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subtropical climate; Soluble sugars; Understory; Water stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602945

Morpho-physiological characteristics by sweet potato cultivars as function of irrigation depth
Provedor de dados: 42
Autores: DELAZARI,FÁBIO T.; ASSIS,IGOR R.; CABRERA,DIEGO F.V.; FERREIRA,MARIANE G.; DIAS,LUIZ E.; RUEDA,ANGELICA; ZANUNCIO,JOSÉ C.; SILVA,DERLY J.H.
Abstract The sweet potato is an alternative energy source, but its sustainability depends on efficient water use. The objective of this study was to evaluate sweet potato morpho-physiological characteristics, and water use efficiency (WUE). Irrigation depths of 50, 75, 100, and 125% of crop evapotranspiration (ETc) were applied. The morpho-physiological indicators, WUE, leaf area index (LAI), leaf water potential, leaf temperature, and leaf chlorophyll index (ICF), were evaluated. The WUE of the sweet potato cultivars increased until the 75% water depth of the ETc. The LAI of these cultivars increased with irrigation depth, with higher values at 100% of the ETc. The leaf water potential of the two sweet potato cultivars was lowest with the lower irrigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ipomoea batatas; Irrigation management; Leaf temperature; Water stress; Water use efficiency.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703541

Growth and production of volatile compounds of yarrow (Achillea millefolium L.) under different irrigation depths
Provedor de dados: 42
Autores: ALVARENGA,IVAN C.A.; PACHECO,FERNANDA V.; ALVARENGA,AMAURI A.; BERTOLUCCI,SUZAN K.V.; PINTO,JOSÉ EDUARDO B.P.
Abstract Yarrow (Achillea millefolium L., Asteraceae) is an important medicinal plant used worldwide for its medicinal properties such as the analgesic, antioxidant and anti-inflammatory ones. The aim of this study was to evaluate the growth and production of photosynthetic pigments and of volatile constituents of Achillea millefolium L. under different irrigation depths. The treatments were the application of 55, 110, 220, 440 and 880 mm of water for a period of 110 days. Data were submitted to polynomial regression analysis at 5% probability, while the volatile constituents were analyzed by standard deviation. Different irrigation depths provided quadratic growth responses being the highest dry matter production at the depth of 440 mm. The contents of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; 1; 8 cineol; Chlorophyll; Terpenes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703901

Water relations and leaf growth rate of three agropyron genotypes under water stress
Provedor de dados: 47
Autores: García,María G.; Busso,Carlos A.; Polci,Pablo; García Girou,Norberto L.; Echenique,Vivivan.
The effects of water stress on leaf water relations and growth are reported for three perennial tussock grass genotypes under glasshouse conditions. Studies were performed in genotypes El Palmar INTA and Selección Anguil of Agropyron scabrifolium (Döell) Parodi, and El Vizcachero of A. elongatum (Host) Beauv. Agropyron scabrifolium El Palmar INTA is native to a region with warm-temperate and humid climate without a dry season, and an average annual precipitation of 900 mm. Agropyron scabrifolium Selección Anguil comes from a region with a sub-humid, dry to semiarid climate and a mean annual precipitation of 600 mm. Agropyron elongatum is a widespread forage in semiarid Argentina with well-known water stress resistance. A mild water stress treatment was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agropyron scabrifolium (Döell) Parodi; Agropyron elongatum (Host) Beauv; Water stress; Water relations; Leaf growth rate.
Ano: 2002
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452002000300001

Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings
Provedor de dados: 48
Autores: PEÑA-VALDIVIA,CECILIA B; SÁNCHEZ-URDANETA,ADRIANA B.
The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (Yw), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at Yw between -0.03 and -2.35 MPa. Root dimensions, proline content and anatomy were evaluated. Substrate &amp;#968;w between -0.65 and -2.35 MPa did not significantly affect longitudinal root growth. However, proline content significantly increased from 1.6 to 2.1 emoles mg-1. Significant reductions of transverse root area (41 %), thickness of mucilage covering the epidermis (47 %), thickness of epidermis (between 15 and 46 %), area of the parenchyma (between 35 and 41 %)...
Tipo: Journal article
Palavras-chave: Maguey; Proline; Root anatomy; Root growth; Water deficit; Water stress.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200013

Effects of an atypical drought on the benthic macroinvertebrate community in a tropical reservoir
Provedor de dados: 49
Autores: Anacléto,Maria José Pinheiro; Ligeiro,Raphael; Barbosa,José Etham de Lucena; Molozzi,Joseline; Callisto,Marcos.
Abstract Atypical drought events have increasingly occurred in Brazil over the last years due to global climate changes. However, their consequences on aquatic biota in reservoirs are poorly known. We tested the hypothesis that macroinvertebrate communities are negatively affected by atypical drought events, given the sensitivity of many taxa to environmental changes. We predicted that: (a) there would be changes in limnological and sediment parameters between a regular year and an atypical year, (b) abundance and richness of the genera of Chironomidae and of exotic species would be higher due to the enhanced ability of these organisms to adapt to changes in the physical environment, and (c) community structure metrics (i. richness; ii. % richness; iii....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic fauna; Exotic species; Ecological integrity; Water stress; Climate changes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000200205

Variation in the sugar yield in response to drying-off of sugarcane before harvest and the occurrence of low air temperatures
Provedor de dados: 53
Autores: Araújo,Renato; Alves Junior,José; Casaroli,Derblai; Evangelista,Adão Wagner Pêgo.
ABSTRACT The need to irrigate sugarcane in the Brazilian Savanna is due to the lack of rain from April to September. For efficient sugar accumulation, the crop needs water stress or heat stress at the maturation stage. However, when the water deficit is intense at this stage, it occurs the reduction in crop production. The objective of this study was: (i) to assess the quality of the raw material of sugarcane in different drying-off seasons before harvest; (ii) to evaluate the influence of heat stress on the culture. The experiment was conducted in Santo Antônio de Goiás (GO), Brazil, in Oxisol, with CTC4 variety in cane-plant cycle. A randomized block design in a split-plot array in time was used. The treatments of the plots were five drying-off times...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Irrigation management; Brazilian savanna; Thermal stress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100118

Differential expression of the genes involved in responses to water-deficit stress in peach trees cv. Chimarrita grafted onto two different rootstocks
Provedor de dados: 53
Autores: Rickes,Leticia Neutzling; Klumb,Elsa Kuhn; Benitez,Letícia Carvalho; Braga,Eugenia Jacira Bolacel; Bianchi,Valmor João.
ABSTRACT Water deficit is responsible for a negative impact on agricultural systems. Several physiological, biochemical, and molecular processes are initiated as a response to water-deficit stress. Quantifying the differential expression of the genes involved in the response to water-deficit stress plays a key role in the development of molecular strategies for engineering water-stress tolerance in plants. Therefore, the present study aims to evaluate the expression of key genes involved in the water-deficit response process in peach trees cv. Chimarrita grafted onto two different rootstocks. The experimental design was completely randomized, with four treatments that correspond to the evaluation periods: day zero (control), the fourth, seventh, and ninth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Osmotic adjustment; Water stress; RT-qPCR; S6PDH; P5CS.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000100060

Grain yield stability of wheat genotypes under irrigated and non-irrigated conditions
Provedor de dados: 52
Autores: Okuyama,Lauro Akio; Federizzi,Luiz Carlos; Barbosa Neto,José Fernandes.
Analyses of genotype by environment interactions were carried out for wheat genotypes grown under irrigated and non-irrigated field conditions, in two sowing dates during three years. The linear regression method was used to analyze the stability of grain yield. Genotype by environment interactions was observed for grain yield in all groups of environments. Nesser was the most productive and stable genotype in all groups of environments, followed by IAPAR 17-Caeté. In the late sowing, better yield performances were observed for the cultivars OCEPAR 7-Batuíra, IAPAR 17-Caeté and Nesser, under irrigated condition, and Nesser and IAPAR 28-Igapó, under non-irrigated condition. The results indicated that Nesser gave high grain yield with superior adaptability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought tolerance; Genotype by environment interaction; Water stress.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000600004

Effect of leaf Water potential on cold tolerance of Coffea arabica L.
Provedor de dados: 52
Autores: Caramori,Lázara Pereira Campos; Caramori,Paulo Henrique; Manetti Filho,João.
Young coffee plants from cultivar Mundo Novo of Coffea arabica were grown without irrigation for 32 consecutive days, to evaluate the effect of leaf water potential on damage caused by low temperatures, under controlled conditions. A wide range of leaf water potentials were evaluated, from - 0.45MPa (wet soil) at the beginning of the experimental period, to - 4.8MPa (severe leaf wilting) at the end. Results showed that under moderate water stress, there was a higher frequency of undamaged plants and lower frequency of severely damaged plants. These results help explain part of the regional variability observed after a frost and stress the importance of new studies associating cold and drought tolerance in coffee.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cold tolerance; Coffee; Leaf water potential; Water stress.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600006

Germination of Jacaranda mimosifolia (D. Don - Bignoniaceae) seeds: effects of light, temperature and water stress
Provedor de dados: 52
Autores: Socolowski,Fábio; Takaki,Massanori.
Investigations were carried out to study the effect of light, temperature and water stress on the germination of seeds of Jacaranda mimosifolia which showed the minimum and maximum germination temperature at 15 and 40º C, respectively. The optimum temperature was 25º C with high percentage and germination rate. Slight promotive effect of white light was observed. Under water stress conditions the effect of light was high but at optimum temperature no effect of light was observed. At -0.9MPa few seeds germinated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jacaranda mimosifolia; Seed germination; Phytochrome; Water stress; Light sensitivity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500014

Effects of water deficit and rehydration on the polar lipid and membranes resistance leaves of Phaseolus vulgaris L. cv. Pérola
Provedor de dados: 52
Autores: Martins Júnior,Raimundo Rômulo; Oliveira,Micheline Soares Costa; Baccache,Maria Ary; Paula,Fernando Monteiro de.
Bean leaves (Phaseolus vulgaris L.) cv. Pérola were used to evaluate the water deficit effects in polar lipids composition and in the electric conductivity. The results showed that the water deficiency a effected in the electrolytes loss which increased gradually in response to water deficit. This suggested a compartimentalization loss, due to the structural cellular membranes elements degradation. Total lipids contents decreased by reason of the water stress action. The polyunsaturated fatty acid contents (linoleic and linolenic acids) suffered a decrease while saturated fatty acid (palmitic and stearic acids) increased. The imbalance in the fatty saturated/unsaturated acid relation led to a reduction in the unsaturation index. The electrolytes loss...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polar lipids; Membranes resistance; Water stress.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200016

Main Stem and Tiller Contribution to Wheat Cultivars Yield Under Different Irrigation Regimes
Provedor de dados: 52
Autores: Destro,Deonisio; Miglioranza,Édison; Arias,Carlos Alberto Arrabal; Vendrame,Jefferson Marcos; Almeida,José Carlos Vieira de.
The present study was carried out to determine the contribution of main stems and tillers to the total yield of two wheat cultivars (Triticum aestivum L.), Cocoraque and BH-1146, under two water treatments: a) normal field conditions, and; b) irrigation, in Londrina, PR, Brazil. The experiment was an eight replication randomized complete block design with treatments arranged in split-plots. Data on total grain yield, main stem grain yield, tillers grain yield, the ratio between tiller and total grain yield, yield components and other 17 traits were collected. The cultivar BH-1146 had a higher total grain yield in relation to Cocoraque under normal field conditions; i, e., under water stress. Main stem grain yield responded positively and significantly to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Harvest index; Growth period; Hectolitric weight; Poaceae; Water stress.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400001

Pelletization of seeds of Raphanus sativus L. cv. Redondo Gigante with graphite for germination under water stress conditions
Provedor de dados: 52
Autores: Freitas,Nobel Penteado; Takaki,Massanori.
The effect of water stress on germination of radish seeds is dependent on the presence of light. The effect of pelletization of radish seeds with powdered graphite on the tolerance to water stress under light was analysed. White light and far-red lights were filtered by graphite increasing slightly the tolerance of pelleted seeds to water stress of -0.77MPa. Although red light also inhibited seed germination the graphite had no effect. We propose the pelletization of seeds of Raphanus sativus, at least in cv redondo gigante with graphite as a pratice before planting to increase the tolerance to water stress.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pelletization; Raphanus sativus; Seed germination; Water stress.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500016

Effect of salt and osmotic stresses on the germination of pepper seeds of different maturation stages
Provedor de dados: 52
Autores: Demir,Ibrahim; Mavi,Kazım.
Germination percentage, seedling fresh weight and sensitivity index of the pepper (Capsicum annuum L. cv. Sera Demre) seed lots harvested 50, 60 and 70 days after the anthesis (daa) in 2001 and 2002 were determined under the salt (NaCl) and osmotic (PEG) stresses at the same water potentials of -0.3, -0.6 and -0.9 MPa. The objective was to study whether the germination and seedling growth were inhibited by the salt toxicity or osmotic effect during the development. The higher the salt and osmotic stress concentrations the lower was the germination percentage and seedling fresh weight. The seed germination was higher and sensitivity index were lower in NaCl than in PEG at the same water potential and harvest in both the years. They were able to germinate at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Salinity; Water stress; Germination.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500004

Growth and Mineral Nutrition of the Chickpea ( Cicer arietinum L.)-Rhizobia Symbiosis under Water Deficit
Provedor de dados: 52
Autores: Khadraji,Ahmed; Mouradi,Mohammed; Ghoulam,Cherki.
ABSTRACT The effect of the water deficit on the fresh and dry weight in the various parts of the plant and on several mineral processes in different symbiotic combinations for the chickpea (Cicer arietinum L.) varieties was studied. The experiment was undertaken in the greenhouse during five weeks.Seedlings were separately inoculated with a suspension of three rhizobia strains and were grown under water deficit (50% of field capacity). Our results showed that the inoculation with the adequate rhizobia may improve the chickpea dry weight by improving the nodules weight, increase NR activity and more K+ accumulation under water deficit. Generally, MC0415 (S1) strain gives the best results, particularly in the dry weight nodules (5% of reduction) and in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reductase; K+/Na+ratio; Tolerance; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100319

DROUGHT-INDUCED EFFECTS AND RECOVERY OF NITRATE ASSIMILATION AND NODULE ACTIVITY IN COWPEA PLANTS INOCULATED WITH BRADYRHIZOBIUM SPP. UNDER MODERATE NITRATE LEVEL
Provedor de dados: 58
Autores: Silveira,Joaquim Albenísio Gomes da; Costa,Roberto Cezar Lobo da; Oliveira,José Tadeu Abreu.
This study was carried out to establish comparative effects of drought and recovery on the nitrate assimilation and nodule activity related to N2 fixation in cowpea plants [Vigna unguiculata L. (Walp.)] previously inoculated with Bradyrhizobium spp. BR-3256 (CB-756) strain in the presence of 5 mol m-3 NO-3. Twenty-eight-day-old nodulated plants were submitted to water deprivation during 4 consecutive days and afterwards resupplied with nutrient solution during 2 days. The water deprivation caused a rapid increase in the nitrate content in root and a marked reduction in leaf nitrate reductase (NR) activity. In contrast nodule NR activity was slightly increased by water deprivation. Concomitantly, in nodules of water stressed plants, leghemoglobin and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glutamine synthetase; Leghemoglobin; Nitrate reductase; N2 fixation; Water stress; Vigna unguiculata (L.) Walp.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000300005

Plant BiP gene family: differential expression, stress induction and protective role against physiological stresses
Provedor de dados: 61
Autores: Carolino,Sonia Madali Boseja; Vaez,Juliana Rocha; Irsigler,André Southernman Teixeira; Valente,Maria Anete S.; Rodrigues,Leonardo Augusto Zebral; Fontes,Elizabeth Pacheco Batista.
In contrast to yeast or mammalian counterpart, BiP (Binding Protein) from several plant species, such as maize, tobacco, Arabidopsis and soybean, is encoded by a multigene family. A systematic characterization and analysis of soybean BiP expression have provided evidence for the existence of multiple, complex regulatory mechanisms controlling plant BiP gene expression. In support of this observation, the soybean BiP gene family has been shown to exhibit organ-specific expression and differential regulation in response to abiotic stresses through distinct signaling pathways. As a member of the stress-regulated HSP70 family of protein, the elucidation of plant BiP function and regulation is likely to lead do new strategies to enhance crop tolerance to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endoplasmic reticulum; ER stressors; Grp78; Molecular chaperone; Unfolded protein response; Water stress.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200001

cDNA-AFLP analysis of Psidium guajava L. cultivars under water stress and mechanical injury: methodological implications
Provedor de dados: 61
Autores: Furlan,Cláudia Maria; Zanotta,Samantha; Salatino,Antonio.
Studies involving amplified fragment length polymorphism (cDNA-AFLP) have often used polyacrylamide gels with radiolabeled primers in order to establish best primer combinations, to analyze, and to recover transcript-derived fragments. Use of automatic sequencer to establish best primer combinations is convenient, because it saves time, reduces costs and risks of contamination with radioactive material and acrylamide, and allows objective band-matching and more precise evaluation of transcript-derived fragments intensities. This study aimed at examining the gene expression of commercial cultivars of P. guajava subjected to water and mechanical injury stresses, combining analyses by automatic sequencer and fluorescent kits for polyacrylamide gel...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Automatic sequencer; Gene expression; Mechanical injury; Water stress.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000100005

Autonomy and network modulation of photosynthesis and water relations of Coffea arabica in the field
Provedor de dados: 61
Autores: Camargo-Bortolin,Lívia H.G. de; Prado,Carlos H.B. A.; Souza,Gustavo M.; Novaes,Paula.
The degree of connection between leaf gas exchange and leaf water potential, and the autonomy of these variables in relation to meteorological conditions were determined in three cultivars of Coffea arabica during clear and cloudy days. High values of vapor pressure deficit, air temperature and photosynthetic photon flux density resulted in low leaf autonomy during a clear day, irrespective the degree of connection among leaf physiological variables. Tight synchronization between physiological and meteorological variables was considered one important cause of net photosynthesis (P N) decreasing during a clear day. In contrast, diurnal P N was around three times higher on a cloudy day, when all cultivars presented high autonomy. Principal component analyses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Connectance degree; Daily net photosynthesis; System analysis; Water stress.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000200006

Physiological characteristics of cassava tolerance to prolonged drought in the tropics: implications for breeding cultivars adapted to seasonally dry and semiarid environments
Provedor de dados: 61
Autores: El-Sharkawy,Mabrouk A.
The paper summarizes research conducted at International Center for Tropical Agriculture (CIAT) on responses of cassava to extended water shortages in the field aided by modern gas-exchange and water-relation techniques as well as biochemical assays. The aim of the research was to coordinate basic and applied aspects of crop physiology into a breeding strategy with a multidisciplinary approach. Several physiological characteristics/traits and mechanisms underpinning tolerance of cassava to drought were elucidated using a large number of genotypes from the CIAT core germplasm collection grown in various locations representing ecozones where cassava is cultivated. Most notable among these characteristics are the high photosynthetic capacity of cassava leaves...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Breeding; Canopy; Carboxylation enzymes; C3-C4 intermediate; Ecophysiology; Growth; Leaf photosynthesis; Manihot sp.; PEP carboxylase; Productivity; Stomata; Water stress; Yield.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400003

Interactions between leaf water potential, stomatal conductance and abscisic acid content of orange trees submitted to drought stress
Provedor de dados: 61
Autores: Gomes,Mara de Menezes de Assis; Lagôa,Ana Maria Magalhães Andrade; Medina,Camilo Lázaro; Machado,Eduardo Caruso; Machado,Marcos Antônio.
Thirty-month-old 'Pêra' orange trees grafted on 'Rangpur' lemon trees grown in 100 L pots were submitted to water stress by the suspension of irrigation. CO2 assimilation (A), transpiration (E) and stomatal conductance (g s) values declined from the seventh day of stress, although the leaf water potential at 6:00 a.m. (psipd) and at 2:00 p.m. (psi2) began to decline from the fifth day of water deficiency. The CO2 intercellular concentration (Ci) of water-stressed plants increased from the seventh day, reaching a maximum concentration on the day of most severe stress. The carboxylation efficiency, as revealed by the ratio A/Ci was low on this day and did not show the same values of non-stressed plants even after ten days of rewatering. After five days of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abscisic acid; Citrus sinensis; Gas exchanges; Water stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000300005

Utility of basic research in plant/crop physiology in relation to crop improvement: a review and a personal account
Provedor de dados: 61
Autores: El-Sharkawy,Mabrouk A.
Agricultural research and development plays an essential role in a nation's economic development, providing for food security for an ever-increasing population. In developed countries, the gap between potential and actual yield is largely closed because of a combination of advanced technologies, high-yielding new varieties and the application of agrochemicals in highly mechanized production systems. In most of these countries, agricultural production exceeds national demand, resulting in excess products for export. In many of the developing countries, however, agricultural productivity is still far below what it should be because of multiple technical and socio-economic constraints. Food deficits are the norm in poor and middle-income countries, requiring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Breeding; C4-photosynthesis; Drought-tolerance; Ecophysiology; Ecosystems; Hormones; Photoperiod; Productivity; Soil; Water stress.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400001

Physiological parameters in sugarcane cultivars submitted to water deficit
Provedor de dados: 61
Autores: Graça,José Perez da; Rodrigues,Fabiana Aparecida; Farias,José Renato Bouças; Oliveira,Maria Cristina Neves de; Hoffmann-Campo,Clara Beatriz; Zingaretti,Sonia Marli.
To investigate the processes involved in the susceptibility of sugarcane plants to water deficit, several physiological parameters were evaluated in drought tolerant (SP83-2847 and CTC15) and sensitive (SP86-155) cultivars. The water deficit affected the photosynthetic apparatus of all the plants in different ways, within and among cultivars. The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit. In control plants of the tolerant cultivars (SP83-2847 and CTC15) the photosynthetic rate was higher than in the sensitive cultivar (SP86-155). Cultivar CTC15 showed the highest relative water content during the dry period. The quantum efficiency photosystem II of cultivar SP83-2847 was more stable in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosynthetic efficiency; Relative water content; Saccharum; Water stress; Drought.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300006

Water deficit effect on the accumulation of biomass and artemisinin in annual wormwood(Artemisia annua L., Asteraceae)
Provedor de dados: 61
Autores: Marchese,José A.; Ferreira,Jorge F.S.; Rehder,Vera L.G.; Rodrigues,Osmar.
Despite the importance of Artemisia annua L. as the only source of the anti-parasitic drug artemisinin, little is known on the effects of biotic and abiotic stress on artemisinin accumulation. Water deficit is the most limiting factor on plant growth, however it can trigger secondary metabolite accumulation, depending on the plant growth stage and intensity. A. annua cultivated in growth chambers was submitted to five water deficit treatments (watered, 14, 38, 62 e 86 hours without irrigation). Water deficits of 38 and 62 hours (Yw = -1.39 and -2.51 MPa, respectively) increased leaf artemisinin content, but only 38 hours led to a significant increase in both leaf and plant artemisinin (29%), with no detriment to plant biomass production. The other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malaria; Secondary metabolism; Terpene; Drought; Water stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000100001

Soil drying and rewatering applied at three grain developmental stages affect differentially growth and grain protein deposition in wheat (Triticum aestivum L.)
Provedor de dados: 61
Autores: Beltrano,José; Ronco,Marta Guillermina; Arango,María Cecilia.
Water deficits cause large yield losses in wheat. Although anthesis is generally considered the most vulnerable period, water deficit during grain filling can also cause yield losses. The objective of this study was to investigate the effect of water stress and rewatering, at three different grain developmental stages, on physiological and grain filling parameters and on yield components. Wheat plants were subjected to water deficit and rewatering at the watery ripe, milk and soft dough stages. In the flag leaf, water stress decreased the relative water content, the chlorophyll and protein content and increased the leakage of solutes, at all three studied grain filling stages. Water stress at the watery ripe and milk stages reduced the final grain dry mass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain filling; Growth rate; Logistic model; Protein profile; Water stress.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200011

Invasiveness of Cut-Leaf Ground-Cherry (Physalis angulata L.) Populations and Impact of Soil Water and Nutrient Availability
Provedor de dados: 117
Autores: Travlos,Ilias S.
Biological invasions are a major threat to natural ecosystems and agroecosystems, while weed flora is noticeably changing globally. In this study we evaluated the potential of cut-leaf ground-cherry (Physalis angulata L.), a species native to America, to invade the semi-arid regions of Greece. Greenhouse and laboratory experiments were conducted to evaluate the effects of different environmental resources (nutrient and water availability) on seedling growth, biomass production, fecundity, and seed germination of four populations of cut-leaf ground-cherry. Our results suggest that cut-leaf ground-cherry does not tolerate extreme drought during the first growth stages, while it can survive and produce adequate and rapidly germinated seed (&gt; 85%) under low...
Tipo: Journal article
Palavras-chave: Physalis angulata; Invasion; Greece; Water stress.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300009

Effect of rainfall regimes on seed production and quality of Avena barbata
Provedor de dados: 118
Autores: Olivares,Alfredo; Johnston,Myrna; Calderón,Carolina.
The effects of rainfall amount and distribution on seed yield and quality in Avena barbata were evaluated in a greenhouse under controlled conditions with simulated rainfall regimes. A randomized complete-block design was used with five replications of one pot each. Seven treatments were established according to rainfall regimes for a real year in the semiarid zone in the Metropolitan Región, Chile: normal rainfall (1982), late rainfall (1987), normal-early rainfall (1962), normal-late rainfall (1989), dry-early rainfall (1981) and dry-late rainfall (1990). One treatment without water stress was left for comparison. One-year-old seeds were planted in pots with disinfected soil. The five most uniform plants in terms of size and health were chosen for the...
Tipo: Journal article
Palavras-chave: Avena; Development; Growth; Seeds; Water stress.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100006

Responses of young Punica granatum plants under four different water regimes
Provedor de dados: 118
Autores: Bugueño,Felipe; Livellara,Nieggiorba; Varas,Fernando; Undurraga,Pedro; Castro,Mónica; Salgado,Eduardo.
We studied the effect of four irrigation treatments, expressed as fractions (1.3, 1.0, 0.7 and 0.3) of crop evapotranspiration (ETc), on the growth of young pomegranate plants in central Chile (32°32&amp;#8217; S and 71°06&amp;#8217; W). We evaluated the effect of the four treatments on canopy volume (CV) during two growing seasons. For 28 days during the second growing season, we evaluated soil moisture content (0), the soil-moisture depletion factor (p), trunk cumulative growth (TCG), trunk growth rate (TGR) and maximum daily trunk shrinkage (MDS). We found relationships between CV and TCG and between CV and TGR. There were no differences in MDS among the irrigation treatments. We observed significant water stress in plants in the 0.3 ETc treatment (p =...
Tipo: Journal article
Palavras-chave: Dendrometer; Depletion fraction (p); Canopy volume (CV); Maximum daily trunk shrinkage (MDS); Trunk diameter; Trunk growth rate (TGR); Water stress.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100005

Impact of cyclic water stress on growth, physiological responses and yield of rice (Oryza sativa L.) grown in tropical environment
Provedor de dados: 65
Autores: Zain,Nurul Amalina Mohd; Ismail,Mohd Razi; Puteh,Adam; Mahmood,Maziah; Islam,M Robiul.
A series of water stress cycles [5, 10, 15, 20, 25 and 30 days of irrigation intervel including control flooded (CF), control saturated (CS)] were exposed to investigate the impact of cyclic water stress on growth, physiological responses and yield of a famous Malaysian rice variety, MR220. The study also aimed to determine optimum irrigation schedule for better production of rice. It was observed that grain yield, total biomass, filled spikelet, 1000 grain weight, total panicle, tillers mortality, plant height and number of tillers per plant reduces with increased duration of water stress cycles. Grain yield was higher both in CF and CS condition and those are statistically identical to 5 days of stress cycle or irrigation intervel. The present experiment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Prolein accumulation; Antioxidant enzyme; Rice variety MR220.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001202136

Plant traits to complement selection based on yield components in wheat
Provedor de dados: 65
Autores: Okuyama,Lauro Akio; Federizzi,Luiz Carlos; Barbosa Neto,José Fernandes.
The aim of the present study was to investigate the relationship between plant traits and yield per spike in wheat genotypes. The measured plant traits were: length of flag leaf blade, peduncle extrusion, peduncle, spike and sheath, culm diameter and plant height. Data were analyzed with correlation and path coefficient analysis. Yield per spike correlated positively with spike length and culm diameter. Path coefficient analysis indicated that, under irrigated condition, yield per spike had a positive direct effect and a positive correlation with spike length and culm diameter and, under non-irrigated condition, yield per spike showed a positive direct effect and a positive correlation with culm diameter, spike length and plant height. Culm diameter and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlation; Path analysis; Water stress; Irrigation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782005000500005

Influence of water regime on initial growth and essential oil of Eucalyptus globulus
Provedor de dados: 65
Autores: Queiroz,Túlio Barroso; Pereira,Nayara Natacha de Jesus; Silva,Júlio Cesar Rodrigues Lopes; Fonseca,Francine Souza Alves da; Martins,Ernane Ronie.
ABSTRACT: Understanding the water requirement of forest species in the seedling stage supports cost reduction by eliminating unnecessary irrigation in addition to providing higher productivity. This study was carried out to evaluate the effect of the water regime on initial growth, leaf production and content and chemical composition of the essential oil of Eucalyptus globulus , during the first 120 days of cultivation. The experiment employed a completely randomized design and was carried out at the Instituto de Ciências Agrárias da Universidade Federal de Minas Gerais (ICA/UFMG), Montes Claros, MG. Treatments consisted of six different water regimes (50%, 75%, 100%, 125%, 150% and 175% of the reference evapotranspiration - ETo) with four replicates....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus; Irrigation; Water stress; Eucalyptus globulus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300301

Do we know how plants sense a drying soil?
Provedor de dados: 65
Autores: Streck,Nereu Augusto.
The reduction of crop growth and yield in dry areas is largely due to stomatal closure in response to dry soil, which decreases photosynthesis. However, the mechanism that causes stomatal closure in a drying soil is a controversial issue. Experienced and respected plant physiologists around the world have different views about the primary sensor of soil water shortage in plants. The goal of this review is to present a chronological synthesis about the evidence of the possible candidates for the mechanism by which plants sense a drying soil. Hydraulic signals in the leaves as the mechanism that causes stomatal closure dominated the view on how plants sense a drying soil during the 70’s and the early 80’s. In the middle 80’s, studies suggested that stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water; Plant water; Water stress; Stomatal conductance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000200039

Correlation and path analysis of yield and its components and plant traits in wheat
Provedor de dados: 65
Autores: Okuyama,Lauro Akio; Federizzi,Luiz Carlos; Barbosa Neto,José Fernandes.
This study was aimed to characterize yield components and plant traits related to grain yield. Correlation and path analysis were carried out in wheat genotypes grown under irrigated and non-irrigated field conditions. In the path coefficient analysis, grain yield represented the dependent variable and the number of spikes m-2, number of grains spike-1, kernel weight, days to anthesis, above-ground biomass m-2 and plant height were the independent ones. In both years, periods without rain occurred from early milk to grain ripening and from flag leaf sheath opening to grain ripening for first and second sowing dates, respectively. Character associations were similar in both water regimes. Grain yield showed positive phenotypic correlation with above-ground...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Water stress; Higher grain yield.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000600006

Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
Provedor de dados: 64
Autores: Melo,Emanuelle Ferreira; Fernandes-Brum,Christiane Noronha; Pereira,Fabrício José; Castro,Evaristo Mauro de; Chalfun-Júnior,Antonio.
Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee tree; Ecophysiology; Water stress; Nitrate reductase.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000100003

Response to water deficit of Ipomoea cairica (L.) Sweet
Provedor de dados: 64
Autores: Tognon,Grasiela Bruzamarello; Petry,Cláudia; Cuquel,Francine Lorena.
Green spaces require frequent watering, increasing the pressure on water resources. The use of native plants in landscaping reduces the risks of biological contamination, contributing to preservation of Brazilian biodiversity and provides the value of sustainability in urban green areas. Of these native plants, a restricted number are native lianas which are adapted to Brazilian climate and available on the market. In this regard, the selection and recommending of native plants which are efficient in use of water for planting in urban areas constitute an effective strategy for conservation of water resources. Thus, the purpose of this study was to evaluate the growth and development of I. cairica plants submitted to water deficit. For a period of 100 days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morning glory; Climbing plants; Water stress; Landscaping.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300007