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Registros recuperados: 28
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African Mahogany transpiration with Granier method and water table lysimeter AGRIAMBI
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
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Analysis of Hydraulic Conductance Components in Field Grown, Mature Sweet Cherry Trees Chilean J. Agric. Res.
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 (Ψ). 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
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Anatomical and physiological characteristics of two argentine wheat cultivars Ciência Rural
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
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ASSESSMENT OF CORN WATER UPTAKE BASED ON SAP HEAT TRACING UNDER WATER-STRESSED CONDITIONS AGRIAMBI
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
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Calibrated heat-pulse method for the assessment of maize water uptake Scientia Agricola
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
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Características fotossintéticas de genótipos de capim-elefante anão (Pennisetum purpureum Schum.), em estresse hídrico - DOI: 10.4025/actascianimsci.v32i1.8961 Animal Sciences
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
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Carbohydrate production and transport in cotton cultivars grown under boron deficiency Scientia Agricola
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
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Crescimento vegetativo, resistência estomática, eficiência fotossintética e rendimento do fruto da melancieira em diferentes níveis de água - DOI: 10.4025/actasciagron.v32i1.2136 Agronomy
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
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Effect of soil water availability on gas exchange in young trees of Eucalyptus grandis W. Hill ex Maiden Acta Agron. (Palmira)
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
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Effects of salt stress on plant growth, stomatal response and solute accumulation of different maize genotypes Braz. J. Plant Physiol.
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
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Gas exchange alteration caused by water deficit during the bean reproductive stage AGRIAMBI
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
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Gas exchange of the umbu tree under semi-arid conditions Rev. Bras. Frutic.
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
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Gas exchange rates, plant height, yield components, and productivity of upland rice as affected by plant regulators PAB
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
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Gold phytoextraction and mining-degraded soil reclamation Acta Agron. (Palmira)
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
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Intensity of bitterness of processed yerba mate leaves originated in two contrasted light environments BABT
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
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Leaf micronutrient concentrations and potential photosynthesis in Ochroma pyramidale established in a degraded land Acta Amazonica
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
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Modifications in vapor diffusion resistence of leaves and water relations in barbados cherry plants under water stress Rev. Bras. Fisiol. Veg.
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
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Morpho-physiological and mineral nutrient characterization of 45 collected Purslane (Portulaca oleracea L.) accessions Bragantia
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<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
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Morpho-physiological changes in pineapple plantlets [Ananas comosus (L.) merr.] during acclimatization Ciência e Agrotecnologia
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
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Physiological Response of Maize and Weeds in Coexistence Planta Daninha
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
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