Consulta: subjectFacets:"Transpiration"
Registros recuperados: 28
Data/hora: 15/06/2024 14:21:46

Water scarcity and oil palm expansion: social views and environmental processes
Provedor de dados: Ecology and Society
Autores: Tarigan, Suria; Soil and Natural Resources Management, Bogor Agricultural University, Indonesia; surya.tarigan@yahoo.com; Agusta, Herdhata; Agronomy and Horticulture, Bogor Agricultural University, Indonesia; agusta@gmx.at; Gunawan, Dodo; Center of Climate Change and Air Quality, Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia; dodogunawan88@gmail.com; Hein, Jonas; Department for Environmental Policy and Natural Resource Management, German Development Institute, Bonn, Germany; Jonas.Hein@die-gdi.de; Hendrayanto, ; Forest Management Department, Faculty of Forestry, Bogor Agricultural University, Indonesia; hendrayanto@gmail.com.
Conversions of natural ecosystems, e.g., from rain forests to managed plantations, result in significant changes in the hydrological cycle including periodic water scarcity. In Indonesia, large areas of forest were lost and extensive oil palm plantations were established over the last decades. We conducted a combined social and environmental study in a region of recent land-use change, the Jambi Province on Sumatra. The objective was to derive complementary lines of arguments to provide balanced insights into environmental perceptions and eco-hydrological processes accompanying land-use change. Interviews with villagers highlighted concerns regarding decreasing water levels in wells during dry periods and increasing fluctuations in stream flow between...
Tipo: Peer-Reviewed Reports
Palavras-chave: Eco-hydrology; Environmental perception; Erosion; Evapotranspiration; Forest; Land-use change; Runoff; Rural water supply; Streamflow; Transpiration.
Ano: 2016

Transpiracao de goiabeira atraves do balanco de calor caulinar.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: MOURA, M. S. B. de; SILVA, B. B. da; SOARES, J. M.; AZEVEDO, P. V. de; OLIVEIRA, M. B. L.; LOPES, P. M. O.
O objetivo do presente trabalho foi estudar a aplicabilidade do método do balanço de calor no caule em um pomar de goiabeira (Psidium guajava L.) e sua resposta ao estresse hídrico e a poda de frutificação.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Transpiracao; Guava; Goiaba; Psidium Guajava; Radiação Solar; Solar radiation; Transpiration.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134266

Gas exchange rates, plant height, yield components, and productivity of upland rice as affected by plant regulators
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Alvarez,Rita de Cássia Félix; Crusciol,Carlos Alexandre Costa; Nascente,Adriano Stephan; Rodrigues,João Domingos; Habermann,Gustavo.
The objective of this work was to evaluate gas exchange rates, plant height, yield components, and productivity of upland rice, as affected by type and application time of plant growth regulators. A randomized block design, in a 4x2 factorial arrangement, with four replicates was used. Treatments consisted of three growth regulators (mepiquat chloride, trinexapac-ethyl, and paclobutrazol), besides a control treatment applied at two different phenological stages: early tillering or panicle primordial differentiation. The experiment was performed under sprinkler-irrigated field conditions. Net CO2 assimilation, stomatal conductance, plant transpiration, and water-use efficiency were measured four times in Primavera upland rice cultivar, between booting and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Net photosynthesis; Stomatal conductance; Transpiration; Water-use efficiency.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001000007

Physiological Response of Maize and Weeds in Coexistence
Provedor de dados: Planta Daninha
Autores: BARROS,R.E.; FARIA,R.M.; TUFFI SANTOS,L.D.; AZEVEDO,A.M.; GOVERNICI,J.L.
ABSTRACT This study aimed at evaluating the physiology of maize and weeds when living under different densities. The randomized block design with 4 replications was used. The factorial scheme 5 x 2 + 1 and 5 x 3 was adopted, for maize and weeds respectively, corresponding to weed species (Bidens pilosa, Commelina benghalensis, Urochloa brizantha, Sorghum arundinaceum and Ipomoea triloba) and infestation density (control, 15 and 30 plants m-2). Weeds were kept in coexistence with the maize hybrid DKB 390 PRO 2, with an additional treatment for maize plants absent of competition. It was kept in coexistence with maize hybrid DKB 390 PRO 2 besides an additional treatment with maize plants absent of competition. On day 45 and 60 after maize planting (DAP)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Urochloa brizantha; Sorghum arundinaceum; Photosynthetic rate; Transpiration; Competition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100223

SUNLIT AND SHADED MAIZE CANOPY WATER LOSS UNDER VARIED WATER STRESS
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Santos,Antonio Odair; Bergamaschi,Homero; Fuchs,Marcel; Rosa,Luís Mauro G.; Bergonci,João Ito.
ABSTRACT The precise estimation of transpiration from plant canopies is important for the monitoring of crop water use and management of many agricultural operations related to water use planning. The aim of this study was to estimate transpiration from sunlit and shaded fractions of a maize ( Zea mays L.) canopy, using the Penman-Monteith energy balance equation with modifications introduced by Fuchs et al. (1987) and Fuchs &amp; Cohen (1989). Estimated values were validated by a heat pulse system, which was used to measure stem sap flow and by a weighing lysimeter. A relationship between incident radiation and leaf stomatal conductance for critical levels of leaf water potential was used to estimate transpiration. Results showed that computed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transpiration; Penman-Monteith; Heat pulse; Zea mays L.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43661999000300261

African Mahogany transpiration with Granier method and water table lysimeter
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Sérvulo,Ana C. O.; Vellame,Lucas M.; Casaroli,Derblai; Alves Júnior,José; Souza,Pedro H. de.
ABSTRACT The thermal dissipation probe (Granier method) is useful in the water deficit monitoring and irrigation management of African Mahogany, but its model needs proper adjustment. This paper aimed to adjust and validate the Granier sap flux model to estimate African Mahogany transpiration, measure transpiration using lysimeter and relate it to atmospheric water demand. Weather conditions, transpiration and sap flux were monitored in three units of 2.5-year-old African Mahogany trees in constant water table lysimeter, in Goiânia, GO. Sapwood area (SA), leaf area (LA), transpiration measured by lysimeter (TLYS) and estimated by sap flux (TSF) were evaluated. The SA comprised 55.24% of the trunk’s transversal section. The LA varied from 11.95 to 10.66 m2....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Khaya ivorensis; Sap flux; Transpiration; Lysimeter; Sapwood.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500322

Gas exchange alteration caused by water deficit during the bean reproductive stage
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Endres,Lauricio; Souza,José L. de; Teodoro,Iedo; Marroquim,Paula M. G.; Santos,Claudiana M. dos; Brito,José E. D. de.
The purpose of the present study was to analyze gas exchanges in leaves and the parameters of productivity of beans (Phaseolus vulgaris, L.) submitted to two water deficiency periods during which three water regimes were employed: W1 (1,0 ETo during the entire plant cycle); W2 (1,0 ETo up to the flowering period and irrigation interruption from the 37 to the 51st day following sowing, and W3 (in addition to the reproductive phase, water deficit was also applied during the vegetative stage). Photosynthesis was one of the main physiological factors affected by water deficit. This was not only caused by the stomata closure, but also by carboxilation reduction due to metabolic damage. This effect was, however, offset 24 h after rehydration. During flowering,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosynthesis; Transpiration; Phaseolus vulgaris L.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000100002

ASSESSMENT OF CORN WATER UPTAKE BASED ON SAP HEAT TRACING UNDER WATER-STRESSED CONDITIONS
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
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

Modifications in vapor diffusion resistence of leaves and water relations in barbados cherry plants under water stress
Provedor de dados: Revista Brasileira de Fisiologia Vegetal
Autores: NOGUEIRA,REJANE J. MANSUR C.; MORAES,JOSÉ ANTÔNIO P. V. DE; BURITY,HÉLIO ALMEIDA; BEZERRA NETO,EGÍDIO.
Young sexually and assexually propagated Barbados cherry plants were submitted to water deficit (20 days without irrigation). During this period the accumulation of proline, water potential of branches, osmotic potential, the relative water content of leaves, the leaf diffusive resistance, the transpiration rate and leaf temperature in the cuvette were determined. In addition, photosynthetically active radiation (PAR) and vapor pressure deficit (VPD) were measured in the porometer cuvette. The concentration of proline for both types of plants began to increase on the fifth day without watering, and reached 38.1 times the concentration in the control plants grown from seeds and 26.4 times the concentration in grafted plants on the tenth day without...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighia emarginata; Drought tolerance; Grafting; Proline; Transpiration; Vegetative propagation.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000100009

Water status and gas exchange of umbu plants (Spondias tuberosa Arr. Cam.) propagated by seeds and stem cuttings
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Lima Filho,José Moacir Pinheiro.
The experiment was carried out at the Embrapa Semi-Árido, Petrolina-PE, Brazil, in order to study the physiological responses of umbu plants propagated by seeds and by stem cuttings under water stress conditions, based on leaf water potential and gas exchange measurements. Data were collected in one-year plants established in pots containing 30 kg of a sandy soil and submitted to twenty-day progressive soil water deficit. The evaluations were based on leaf water potential and gas exchange data collection using psychrometric chambers and a portable infra-red gas analyzer, respectively. Plants propagated by seeds maintained a significantly higher water potential, stomatal conductance, transpiration and photosynthesis under decreasing soil water availability....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water potential; Stomatal conductance; Transpiration; Photosynthesis; Root tubers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452007000200032

Gas exchange of the umbu tree under semi-arid conditions
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Lima Filho,José Moacir Pinheiro.
A study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam.) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6:00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the rainy season, however, stomatal conductance, transpiration and photosynthesis were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spondias tuberosa; Stomatal conductance; Transpiration; Photosynthesis; CO2 internal concentration.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000200006

Carbohydrate production and transport in cotton cultivars grown under boron deficiency
Provedor de dados: Scientia Agricola
Autores: Bogiani,Julio Cesar; Amaro,Amanda Cristina Esteves; Rosolem,Ciro Antonio.
An adequate supply of boron (B) is required for the optimal growth and development of cotton (Gossypium hirsutum L.) plants, but the low phloem mobility of B limits the possibilities of correcting B deficiency. There are indications that different cotton cultivars could have different responses to B deficiency. The differences in responses of cotton cultivars to B regarding photoassimilate production and transport were studied in a greenhouse experiment with nutrient solution. Treatments consisted of three cotton cultivars (FMT 701, DP 604BG and FMX 993) and five concentrations of B (0.0, 2.5, 5.0, 10.0 and 20.0 µmol L−1). Sampling began at the phenological stage B1 (first square) and continued for four weeks. The leaf area and the number of reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micronutrient; Nonstructural carbohydrates; Photosynthesis; Transpiration.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600010

Calibrated heat-pulse method for the assessment of maize water uptake
Provedor de dados: Scientia Agricola
Autores: Santos,Antonio Odair; Bergamaschi,Homero; Rosa,Luiz Mauro G.; Bergonci,João Ito.
Plant water requirements are important aspects of crop production to be determined in the field, in order to judiciously manage crop water usage. Water uptake by field grown maize (Zea mays L.), under well-watered 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 seconds following emission of a heat-pulse. Comparisons of the heat-pulse system outputs, lysimetric measurement and transpiration model estimates were monitored on an hourly and daily basis. At normal and low atmospheric demand daily and hourly values of heat-pulse outputs and lysimetric measurement showed good agreement. Hourly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sap flow; Transpiration; Heat-pulse.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100006

การเปลี่ยนแปลงของการสังเคราะห์ด้วยแสงสุทธิ การคายน้ำ การเปิดปากใบ และประสิทธิภาพการใช้น้ำในกระบวนการสังเคราะห์ด้วยแสง ของกิ่งยางพาราสายพันธุ์ RRIM 600 ที่ถูกตัด
Provedor de dados: Thai Agricultural Research Repository
Autores: Auntiporn Keansua; Sukumaporn Sriphadet; Jessada Phattaralerphong.
A study on changes in net photosynthesis (Pn), transpiration (Tr), stomatal conductance (Gs) and photosynthesis water use efficiency (WUE) of cutted rubber branch c.v. RRIM 600. Four methods included, do not put into the water, immediately put the branch into the water after cut, and put into the water after cut 5 and 10 minutes. The comparing of Pn, Tr, Gs and WUE values before and after cut were done. The result were found that Pn, Tr and Gs decrease immediately after branch was cut. The value decreased rapidly in first 15 minutes. Putting the branch into the water immediately, and putting the brance into the water 5 or and 10 minutes after cut expressed that the Pn, Tr, Gs and WUE could restored to the normal value before the branch was cut....
Tipo: PhysicalObject
Palavras-chave: Rubber; Cutted rubber branch; RRIM 600; Photosynthesis; Transpiration; Stomatal conductance; Water use efficiency; Plant physiology analysis; ยางพารา; กิ่งยางพารา; การสังเคราะห์ด้วยแสง; การตอบสนองต่อแสง; การเปิดปากใบ; การคายน้ำ; ประสิทธิภาพการใช้น้ำ; การวิเคราะห์สรีรวิทยาของพืช.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5755

Effect of soil water availability on gas exchange in young trees of Eucalyptus grandis W. Hill ex Maiden
Provedor de dados: Acta Agronómica
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

Gold phytoextraction and mining-degraded soil reclamation
Provedor de dados: Acta Agronómica
Autores: Ramírez Pisco,Ramiro; Gómez Yarce,Juan Pablo; Guáqueta Restrepo,Juan José; Gaviria Palacio,Daniel.
Abstract Gold phytoextraction is a technology used to obtain this metal (Au) throughout plants. Some of the benefits of this technology are the mitigation of the environmental impact, the fact that it does not imply the constant use of pollutants, and has the ability to promote soil reclamation. The aim of this research was to determine if Brachiaria decumbens has the potential to improve soil physical properties while had achieved a gold extraction. For this purpose, Helianthus annuus and Brachiaria decumbens, were used in a completely randomized design with four replicates. To induce gold uptake, ammonium thiocyanate was applied to plants. The statistical analysis was performed using the R-Studio software. Finally, it became evident that B. decumbens is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorption; Aggregates; Transpiration; Roots.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400574

Leaf micronutrient concentrations and potential photosynthesis in Ochroma pyramidale established in a degraded land
Provedor de dados: Acta Amazonica
Autores: MARENCO,Ricardo A.; VIEIRA,Gil; GONÇALVES,José F. de C.
In the Brazilian Amazon, large areas of abandoned lands may revert to secondary forest. In the process, pioneer tree species have an important role to restore productivity in old fields and improve environmental conditions. To determine potential photosynthesis (Apot), stomatal conductance (g), transpiration (E), and leaf micronutrient concentrations in Ochroma pyramidale (Cav. ex Lam.) Urban a study was carried out in the Brazilian Amazon (01o 51' S; 60o 04' W). Photosynthetic parameters were measured at increasing [CO2], saturating light intensity (1 mmol (photons) m-2 s-1), and ambient temperature. The rate of electron-transport (J), Apot,and water-use efficiency (WUE) increased consistently at increasing internal CO2 concentration (Ci). Conversely,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Balsa wood; Electron-transport rate; Reforestation; Stomatal conductance; Transpiration; Water-use efficiency.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000100023

Crescimento vegetativo, resistência estomática, eficiência fotossintética e rendimento do fruto da melancieira em diferentes níveis de água - DOI: 10.4025/actasciagron.v32i1.2136
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Melo, Alberto Soares de; UEPB; Suassuna, Janivan Fernandes; UEPB; Fernandes, Pedro Dantas; UFCG; Brito, Marcos Eric Barbosa; UFCG; Suassuna, Antonio Fernandes; UEPB; Aguiar Netto, Antenor Oliveira; UFS.
Objetivou-se avaliar diferentes regimes hídricos sobre o comportamento morfofisiológico e o rendimento da melancieira em condições de campo no semiárido paraibano. O experimento foi realizado no Setor Experimental da Universidade Estadual da Paraíba, localizado em Catolé do Rocha (PB). Utilizou-se a cultivar Crimson Sweet espaçada de 2,2 m x 0,6 m, no delineamento em blocos ao acaso com quatro tratamentos [40, 70, 100 e 130% da evapotranspiração de referência (mm dia-1)] e oito repetições. As máximas expressões de crescimento foram verificadas na lâmina de água de 204 mm, com área foliar de 1,831 m2, índice de área foliar de 1,35 m2 m-2 e taxa de crescimento de 0,04 m2 dia-1. A resistência estomática foi maior à tarde, independentemente da lâmina de água....
Tipo: Pesquisa experimental
Palavras-chave: 5.01.00.00-9    Agronomia Citrullus lanatus Thumb. Mansf.; Transpiração; Irrigação; Fotossistema II 5.01.03.00-8 Citrullus lanatus Thumb. Mansf.; Transpiration; Irrigation; Photosystem II.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/2136

Características fotossintéticas de genótipos de capim-elefante anão (Pennisetum purpureum Schum.), em estresse hídrico - DOI: 10.4025/actascianimsci.v32i1.8961
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Araújo, Saulo Alberto do Carmo; UFVJM; Vasquez, Hernan Maldonado; UENF; Campostrini, Eliemar; UENF; Netto, Alena Torres; UENF; Deminicis, Bruno Borges; UENF; Lima, Érico da Silva; UENF.
O experimento foi realizado com o objetivo de avaliar as trocas gasosas de genótipos de capim-elefante anão, em diferentes condições hídricas. O delineamento experimental foi inteiramente casualizado com três repetições. Foram avaliados três genótipos de capim-elefante anão (Mott, CNPGL 94-34-3 e CNPGL 92-198-7) em duas condições de umidade do solo: irrigado (I) e não-irrigado (NI). Foi observada diferença entre os tratamentos I e NI para todos os genótipos em relação à taxa fotossintética, condutância estomática, transpiração e déficit de pressão de vapor. O genótipo CNPGL 94-34-3 apresentou maior tolerância ao estresse hídrico, seguido pelos genótipos Mott e CNPGL 92-198-7. Todos os genótipos avaliados apresentaram, em condições ideais de umidade do...
Tipo: Pesquisa de campo
Palavras-chave: Ciências Agrárias condutância estomática; Déficit de pressão de vapor; Fotoinibição; Fotossíntese; Transpiração Zootecnia stomatal conductance; Vapor pressure deficit; Photoinhibition; Photosynthesis; Transpiration.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8961

Morpho-physiological and mineral nutrient characterization of 45 collected Purslane (Portulaca oleracea L.) accessions
Provedor de dados: Bragantia
Autores: Alam,Amirul; Juraimi,Abdul Shukor; Yusop,Mohd Rafii; Hamid,Azizah Abdul; Hakim,Abdul.
This study was carried out to determine, evaluation and characterization of the morphological, physiological as well as mineral nutrient vitiations among all forty five purslane accessions collected from different locations of West Peninsular, Malaysia. Significant differences (p&lt;0.05) were observed for all those traits measured regarding morphological, physiological and mineral composition. Morphological traits viz. plant height varied between 20.06-40.8 cm; number of main branch, 1.4-4.4; number of nodes, 8.4-31; internode distance, 2.1-3.43 cm; stem diameter, 2.12-3.8 mm; number of leaves, 97-1019; leaf area, 1.03-2.21 cm², number of flowers, 14-826.8; root length, 5.09-11.7 cm; fresh weight, 40-280 g; and dry weight varied between 2.71-29.16 g....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Purslane; Total chlorophyll; Photosynthesis; Stomatal conductance; Transpiration; Mineral composition.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000400011

Water osmotic absorption in Coleus blumei plants under salinity stress
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Sena,José Ozinaldo Alves de; Zaidan,Humberto Actis; Castro,Paulo Roberto de Camargo e.
Three month old Coleus blumei plants in pots were treated with different NaCl concentrations: 0.00, 0.25, 0.50 and 1.00%. To determine the water osmotic absorption, the plants had their stems cut at 10 cm from the soil surface. The remaining stems were linked to glass tubes by flexible rubber tubes. Readings of the water column level in the glass tubes were performed at each 30 minutes, corresponding to the water osmotic absorption, with a total of eleven readings. Other Coleus blumei, with the same age, received the NaCl concentrations, and were evaluated under field conditions in terms of transpiration and stomatal resistance. A randomized complete block analysis was used with five replications. An increase of osmotic absorption was verified for all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water relations; Water potential; Transpiration; Stomatal resistance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700001

Intensity of bitterness of processed yerba mate leaves originated in two contrasted light environments
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Rakocevic,Miroslava; Medrado,Moacir José Sales; Lucambio,Fernando; Valduga,Alice Teresa.
The bitterness intensity of beverage prepared from the leaves produced on the males and females of yerba mate (Ilex paraguariensis), grown in the forest understory and monoculture, was evaluated. The leaves were grouped by their position (in the crown and on the branch tips) and by the leaf age. The leaf gas exchange, leaf temperature and photosynthetic photon flux density were observed. Inter and intra-specific competition for light and self-shading showed the same effect on yerba mate beverage taste. All the shading types resulted in bitterer taste of the processed yerba mate leaves compared to the leaves originated under the direct sun exposure. The leaves from the plants grown in the monoculture showed less bitterness than those grown in the forest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf age; Photosynthesis; Shade; Stomatal conductance; Temperature; Transpiration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300018

Effects of salt stress on plant growth, stomatal response and solute accumulation of different maize genotypes
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Azevedo Neto,André Dias de; Prisco,José Tarquinio; Enéas-Filho,Joaquim; Lacerda,Claudivan Feitosa de; Silva,José Vieira; Costa,Paulo Henrique Alves da; Gomes-Filho,Enéas.
Seeds from eight different maize genotypes (BR3123, BR5004, BR5011, BR5026, BR5033, CMS50, D766 and ICI8447) were sown in vermiculite, and after germination they were transplanted into nutrient solution or nutrient solution containing 100 mmol.L-1 of NaCl and placed in a greenhouse. During the experimental period plant growth (dry matter, shoot to root dry mass ratio, leaf area, relative growth rate, and net assimilation rate), leaf temperature, stomatal conductance, transpiration, predawn water potential, sodium, potassium, soluble amino acids and soluble carbohydrate contents were determined in both control and salt stressed plants of all genotypes studied. Salt stress reduced plant growth of all genotypes but the genotypes BR5033 and BR5011 were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth analysis; Osmoregulation; Salinity; Transpiration; Zea mays; Water relations.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100005

Water relations and hydraulic architecture in Cerrado trees: adjustments to seasonal changes in water availability and evaporative demand
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Bucci,Sandra J.; Scholz,Fabian G.; Goldstein,Guillermo; Meinzer,Frederick C.; Franco,Augusto C.; Zhang,Yongjiang; Hao,Guang-You.
We determined adjustments in physiology and morphology that allow Neotropical savanna trees from central Brazil (Cerrado) to avoid water deficits and to maintain a nearly constant internal water balance despite seasonal changes in precipitation and air saturation deficit (D). Precipitation in the study area is highly seasonal with about five nearly rainless months during which D is two fold higher compared to wet season values. As a consequence of the seasonal fluctuations in rainfall and D, soil water potential changes substantially in the upper 100 cm of soil, but remains nearly constant below 2 m depth. Hydraulic architecture and water relations traits of Cerrado trees adjusted during the dry season to prevent increasing water deficits and insure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isohydric behavior; Hydraulic conductivity; Soil water potential and water content; Savanna; Stomatal conductance; Transpiration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300007

Stomatal changes induced by intermittent drought in four umbu tree genotypes
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Silva,Elizamar C.; Nogueira,Rejane J. M. C.; Vale,Fernando H. A.; Araújo,Francisco P. de; Pimenta,Mariana A.
Transpiration (E), diffusive resistance (r s) and anatomical parameters were measured in plants of four grafted umbu tree genotypes (GBUs 44, 48, 50 and 68) in order to evaluate alterations induced by intermittent drought and possible genotypic variations. Transpiration measurements were taken daily until stomatal closure by withholding water. Measurements were also taken, when the plants were re-watered and the watering was interrupted again. This cycle was repeated for a period of 31 days (stress period). The control plants were also irrigated daily. A regular pattern in the stomatal opening/closing mechanism was observed throughout the watering period, exhibiting intra-specific differences. Stomatal behavior of GBU 44 and GBU 68 were influenced by air...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffusive resistance; Spondias tuberosa; Stomatal density; Transpiration; Water deficit.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100005

Analysis of Hydraulic Conductance Components in Field Grown, Mature Sweet Cherry Trees
Provedor de dados: Chilean Journal of Agricultural Research
Autores: Oyarzún,Ricardo; Stöckle,Claudio; Whiting,Matthew.
As a necessary step towards understanding soil water extraction and plant water relationships, the components of hydraulic conductance (K) of mature sweet cherry (Prunus avium L.) trees were evaluated in situ based on a Ohm´s law analog method. In June 2004, K was determined for 10-yr-old ‘Bing’/‘Gisela® 5’ trees, from simultaneous measurements of whole canopy gas exchange and leaf (sunlit and shaded) and stem water potentials (&amp;#936;). Leaf water potential of sunlit leaves was lower than shaded leaves, reaching minimum values of ca. -2.3 MPa around 14:00 h (solar time). Average total hydraulic conductance was 60 ± 6 mmol s-1 MPa-1, presenting a slight decreasing trend as the season progressed. The analysis of tree K components showed that it was...
Tipo: Journal article
Palavras-chave: Plant water relations; Transpiration; Water potential; Whole-canopy gas exchange.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100006

Anatomical and physiological characteristics of two argentine wheat cultivars
Provedor de dados: Ciência Rural
Autores: Filgueira,Raúl Roberto; Golik,Inés Silvina; Sarli,Oliverio Guillermo; Jatimliansky,Raúl Jaime.
Two Argentine field grown wheat cultivars (Triticum aestivum L.), Buck Cencerro (BC) with traditional germoplasm, and Buck Pucará (BP) with Mexican germoplasm, have been investigated in order to compare anatomical and physiological characteristics of the flag leaf measured in heading (stage E59), anthesis (stage E69) and kernel water ripe (stage 71). In both cultivars, photosynthetic rate was not different for the same phenological stage, except for E71. Averages in stage E59 were higher than stages E69 and E71 for both cultivars (22.70, 18.40 and 10.40 µmol m-2 s-1 for BP and 23.82, 18.41 and 8.28 µmol m-2 s-1 for BC, respectively). Transpiration rates were higher in BP (5.0, 5.6 and 4.89 mmol m-2 s-1) than BC (3.3, 4.4 and 2.57 mmol m-2 s-1) for stages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Specific leaf area; Mesophyll area; Carbon dioxide exchange; Transpiration; Leaf anatomy; Conductance.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000400008

Morpho-physiological changes in pineapple plantlets [Ananas comosus (L.) merr.] during acclimatization
Provedor de dados: Ciência e Agrotecnologia
Autores: Villalobo,Ariel; González,Justo; Santos,Ramón; Rodríguez,Romelio.
Pineapple producing countries lack good quality propagation material to expand cultivars into new areas. Previously, research protocols may increase the offer of high quality plantlets and speed the introduction of new pineapple cultivars. The present work is to evaluate the morpho-physiological changes in plantlets of pineapple [Ananas comosus (L.) Merr. 'MD-2'] during the acclimatization phase. Plantlets were acclimatized under 80% relative humidity, 25.5 °C temperature and photosynthetic photon flux of 400-500 µmol m-2 s-1 as average for 45 d under natural photoperiods. All measurements (plant length, number of leaves and roots, fresh weight, width and length of leaf 'D', net photosynthesis and total transpiration rate) were carried out at the end of in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Ex vitro conditions; Photosynthesis; Transpiration.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600004