|
|
|
| Registros recuperados: 112 | |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 (Ψpd) 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 |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
| Registros recuperados: 112 | |
|
|
|
