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Registros recuperados: 29
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A method to improve leaf succulence quantification BABT
Mantovani,André.
Leaf succulence has important physiological and ecological implications. Currently it is quantified by Delf's index (fresh weight/leaf area) and fresh weight/ dry weight ratio. Both indeces are reconsidered and a new index is proposed. Shade and sun leaves from terrestrial, hemiepiphytic and epiphytic aroids were studied. Delf's formula, which does not consider dry weight, overestimated leaf succulence. As fresh weight / dry weight ratio (fw / dw) does not consider leaf area, plants with the same fw / dw ratio were more than five times different in area. The last case was only possible with a decrease in surface / volume ratio and a increase of mesophyll thickness, components not measured by fw / dw ratio. The new index proposed here, which takes into...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf succulence; Water relations; Leaf anatomy; Araceae; Ecophysiology.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100002
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Comportamento estomático de componentes de vegetações secundarias em pousio no nordeste do Pará. Repositório Alice
SÁ, T. D. de A.; OLIVEIRA, V. C. de; WEBER NETO, O.; CARVALHO, C. J. R. de.
bitstream/item/179224/1/Comportamento-estomatico.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Relação com água; Secondary vegetation; Water relations; Fisiologia; Vegetação Secundária; Physiology.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/394310
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Curso diário e sazonal do potencial hídrico foliar de mogno em sistema agroflorestal. Repositório Alice
MORAIS, R. R. de; GONÇALVES, J. F. de C.; COSTA, J. R.; RIBEIRO, G. de O..
Este trabalho objetivou avaliar o curso diário e sazonal do potencial hídrico foliar de mogno (Swietenia macrophylla King) (Meliaceae) em sistema agroflorestal (SAF).
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Swietenia macrophylla; Relações hídricas; Amazônia; Water relations; Mogno.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036758
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Ecophysiology of papaya: a review Braz. J. Plant Physiol.
Campostrini,Eliemar; Glenn,David M..
Papaya (Carica papaya L.) is a principal horticultural crop of tropical and subtropical regions. Knowledge of how papaya responds to environmental factors provides a scientific basis for the development of management strategies to optimize fruit yield and quality. A better understanding of genotypic responses to specific environmental factors will contribute to efficient agricultural zoning and papaya breeding programs. The objective of this review is to present current research knowledge related to the effect of environmental factors and their interaction with the photosynthetic process and whole-plant physiology. This review demonstrates that environmental factors such as light, wind, soil chemical and physical characteristics, temperature, soil water,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya; Environmental factors; Photosynthesis; Water relations; Water-use efficiency.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400010
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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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Environmental drivers of leaf phenology in trees of the tropical species Ficus obtusifolia Braz. J. Plant Physiol.
Ballestrini,Caín; Tezara,Wilmer; Herrera,Ana.
Vegetative as well as reproductive phenology of tropical trees frequently occur synchronously at the end of the dry season. It has been repeatedly observed on two individuals of the tropical species Ficus obtusifolia growing in Caracas that they lose their entire foliage in a period of 48 h during the dry season and renew it within the next 72 h. In order to gain knowledge on the mechanisms that govern leaf exchange in F. obtusifolia, we followed in these two individuals the seasonal changes in leaf and fruit phenology, water relations and environmental variables, and in another 25, phenology only. Although foliar exchange was always observed before the rainy season, it also occurred near the end of the rainy season. An increase in leaf turgor potential of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brevi-deciduous; Day length; Leaf fall; Sap flow velocity; Water relations.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000200003
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Field water relations of species of secondary vegetation under fallow in Northeastern Pará, Brazil. Repositório Alice
SÁ, T. D. A.; WEBER NETO, O.; OLIVEIRA, V.; CARVALHO, C. J. R..
1995
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Vegetação secundária; Relação com água; Brasil; Pará; Secundary vegetation; Water relations.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/397096
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Growing broccoli under salinity: the influence of cultivar and season on glucosinolates content Scientia Agricola
Rios,Juan J.; Agudelo,Agatha; Moreno,Diego A.; Carvajal,Micaela.
ABSTRACT: The evaluation of factors that affect glucosinolates (GLS) concentrations in the roots, leaves, and inflorescence of broccoli plants is important in the improvement of the concentration of bioactive compounds and thus in the enhancement of the nutritional properties. In this work, the yield and the concentration of GLS of seven broccoli cultivars (Brassica oleracea var. italica) grown under salinity in field conditions were studied during three different seasons (autumn, winter, and spring). The results show that, generally, salinity did not alter significantly the inflorescence yield during any of the seasons, indicating a high tolerance of the cultivars tested. Yield was reduced only in cultivar Gea in autumn and in cultivar Parthenon in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cinnamoyl-indol-GLS; Water relations; Inflorescence yield; Mineral nutrients.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601302
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Physiological and agronomical responses of Syrah grapevine under protected cultivation Bragantia
Souza,Claudia Rita de; Mota,Renata Vieira da; Dias,Frederico Alcântara Novelli; Melo,Evaldo Tadeu de; Pimentel,Rodrigo Meirelles de Azevedo; Souza,Laís Cristina de; Regina,Murillo de Albuquerque.
The performance of Syrah grapevine under protected cultivation with different plastic films was evaluated during 2012 and 2013 seasons in South of Minas Gerais State. Agronomical and physiological measurements were done on eight years old grapevines, grafted onto ‘1103 Paulsen’ rootstock cultivated under uncovered conditions, covered with transparent and with diffuse plastic films. Both plastic covers induced the highest shoot growth rate and specific leaf area. The diffuse plastic induced greater differences on leaf area, pruning weight and leaf chlorophyll content as compared to uncovered vines. Grapevines under diffuse plastic also had the lowest rates of photosynthesis, stomatal conductance and transpiration. Leaf starch, glucose and fructose contents...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis vinifera; Plastic cover; Vegetative vigor; Water relations; Gas exchange; Wine grape composition.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000300270
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Physiological and biochemical responses to drought stress in Barbados cherry Braz. J. Plant Physiol.
Medeiros,David Barbosa; Silva,Elizamar Ciriaco da; Santos,Hugo Rafael Bentzen; Pacheco,Cinthya Mirella; Musser,Rosimar dos Santos; Nogueira,Rejane Jurema Mansur Custódio.
To evaluate physiological genotypic differences between two Barbados cherry genotypes (13- and 14-CPA) under water deficit, initial growth, water relations, and organic solute accumulation were evaluated in an experiment performed using four-month-old seedlings, which were subjected to four water treatments (100, 75, 50, and 25% of field capacity), with five replications. Severe water deficit (25% of field capacity) negatively affected plant height, stem diameter, leaf area, dry matter of the leaves and stem to both genotypes, and root dry matter to genotype 13-CPA. Predawn (Ywpd) and midday leaf water potentials (Ywmd) were reduced in plants grown under 25% of field capacity, only in the genotype 14-CPA. There was not a change in relative water content,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malpighia emarginata DC; Soluble organic solutes; Biomass allocation; Water relations; Water deficit.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300005
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Physiological responses of NaCl stressed cowpea plants grown in nutrient solution supplemented with CaCl2 Braz. J. Plant Physiol.
Silva,José Vieira; Lacerda,Claudivan Feitosa de; Costa,Paulo Henrique Alves da; Enéas Filho,Joaquim; Gomes Filho,Enéas; Prisco,José Tarquínio.
Pitiuba cowpea (Vigna unguiculata (L.) Walp.) plants were grown in nutrient solution and kept in a greenhouse up to pre-flowering stage. They were subjected to four different treatments: nutrient solution; nutrient solution containing 75 mmol.L-1 NaCl; nutrient solution containing 75 mmol.L-1 NaCl and 5 mmol.L-1 CaCl2; and nutrient solution containing 75 mmol.L-1 NaCl and 10 mmol.L-1 CaCl2. Salt stress strongly inhibited plant growth, caused a disturbance in plant-water balance, and increased the total content of inorganic solutes in the different plant parts, due mainly to accumulation of Na+ and Cl-. It also increased leaf and root soluble carbohydrates, reduced soluble amino nitrogen both in root tips and in the youngest trifoliate leaves, and reduced...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcium; Growth; Salt stress; Solutes accumulation; Vigna unguiculata; Water relations.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200005
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Postharvest quality of Aster ericoides after treatment with silver thiosulphate and sucrose Ciência Rural
Pivetta,Kathia Fernandes Lopes; Mattiuz,Claudia Fabrino Machado; Melo,Regina Ferreira de; Gimenes,Renata; Romani,Gustavo de Nobrega; Batista,Gisele Sales.
ABSTRACT: Aster (Aster ericoides L.) is a flower crop of North American origin, which belongs to the family Asteraceae. This plant presents capitulum-type inflorescences, widely used as cut flowers. In Brazil, it has been grown only recently, but still has a high expansion potential. In floriculture, pulsing and conditioning solutions are often used to extend the vase life of cut flowers. The present study aimed to evaluate the influence of silver thiosulphate (STS) pulsing and sucrose solutions on the postharvest life of A. ericoides stems. The experiment was carried out under a complete randomized design with treatments arranged in a 2x5 factorial scheme. Treatments consisted of flower stems treated with STS pulsing for 30 minutes, combined with four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water relations; Vase life; Pulsing; Aster.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200202
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Potencial hídrico e condutância estomática de Coffea canephora em condições de Cerrado. Repositório Alice
SANTOS, M. de O.; BRANDÃO, I. R.; CARVALHO, M. A. de F.; RODRIGUES, G. C.; VEIGA, A. D.; MARRACCINI, P.; BARTHOLO, G. F..
O objetivo do estudo foi avaliar a adaptação de diferentes genótipos de Coffea canephora ao sistema de cultivo irrigado do Cerrado do Planalto Central Brasileiro, após o período de suspensão da irrigação, por meio de análises do potencial hídrico e condutância estomática. Foram avaliados genótipos de Coffea canephora (8V, 8, 30, A1, 14 e 22) que estão alocados na Embrapa Cerrados em Planaltina, DF. O plantio foi realizado em linhas, por material, utilizando um espaçamento de 3,7 x 1,0 m em sistema irrigado por pivô central, com manejo de suspensão da irrigação durante a estação seca, por um período de 63dias (30 de junho a 31 de agosto). As avaliações foram realizadas no final desse período em dois horários do dia, em folhas completamente expandidas, do...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Cafeeiro; Relação hídrica; Troca gasosa; Suspensão da irrigação; Coffee; Water relations; Suspension of irrigation; Café; Gas exchange.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114243
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Respuesta del pimiento morrón al secado parcial de la raíz y sustratos en hidroponía e invernadero. Colegio de Postgraduados
Chamú Baranda, Juan Antonio.
La sobre explotación de los acuíferos en México requiere estrategias eficientes en la aplicación y ahorro del agua para la sustentabilidad de los cultivos hortícolas. Así, el objetivo de la presente investigación fue evaluar el efecto de dos niveles de humedad aprovechable residual (HAR) y dos sustratos bajo la técnica de secado parcial de la raíz (SPR) en comparación con riego convencional sobre la fisiología, crecimiento, rendimiento, calidad del fruto y eficiencia en el uso del agua en plantas de pimiento morrón Cannon F1. El experimento se estableció del 15 de abril al 12 de julio de 2010 en condiciones de hidroponía e invernadero, en el Campus Montecillo del Colegio de Postgraduados, México. Los tratamientos se distribuyeron bajo un diseño...
Palavras-chave: Capsicum annuum L.; Relaciones hídricas; Intercambio de gases; Eficiencia en el uso del agua; Water relations; Gas exchange; Water use efficiency; Maestría; Hidrociencias.
Ano: 2010 URL: http://hdl.handle.net/10521/219
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Respuesta del pimiento morrón al secado parcial de la raíz y sustratos en hidroponía e invernadero. Colegio de Postgraduados
Chamú Baranda, Juan Antonio.
La sobre explotación de los acuíferos en México requiere estrategias eficientes en la aplicación y ahorro del agua para la sustentabilidad de los cultivos hortícolas. Así, el objetivo de la presente investigación fue evaluar el efecto de dos niveles de humedad aprovechable residual (HAR) y dos sustratos bajo la técnica de secado parcial de la raíz (SPR) en comparación con riego convencional sobre la fisiología, crecimiento, rendimiento, calidad del fruto y eficiencia en el uso del agua en plantas de pimiento morrón Cannon F1. El experimento se estableció del 15 de abril al 12 de julio de 2010 en condiciones de hidroponía e invernadero, en el Campus Montecillo del Colegio de Postgraduados, México. Los tratamientos se distribuyeron bajo un diseño...
Palavras-chave: Capsicum annuum L.; Relaciones hídricas; Intercambio de gases; Eficiencia en el uso del agua; Water relations; Gas exchange; Water use efficiency; Maestría; Hidrociencias.
Ano: 2010 URL: http://hdl.handle.net/10521/219
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Saline-boron stress in northern Chile olive accessions: water relations, B and Cl contents and impact on plant growth Ciencia e Investigación Agraria
Escobar,Hugo; Lara,Nelson; Zapata,Yubinza; Urbina,Camilo; Rodriguez,Manuel; Figueroa,Leonardo.
H. Escobar, N. Lara, Y. Zapata, C. Urbina, M. Rodriguez, and L. Figueroa. 2013. Saline-boron stress in northern Chile olive accessions: water relations, B and Cl contents and impact on plant growth. Cien. Inv. Agr. 40(3): 597-607. The objective of this study was to analyze the effect of saline-boron stress on the vegetative growth, dry leaf weight, water potential (Ψw), relative water content, and leaf and root B and Cl- contents in 8 accessions of olive. Rooted one-year-old plants were cultivated for 132 days with 50% shading in 5-L pots containing sand substrate and watered with Jensen's nutrient solution. After eight days of uniform ferti-irrigation, the plants were exposed to saline-boron stress, which was administered in three successive...
Tipo: Journal article Palavras-chave: Boron; Chloride; Olive; Salinity; Water relations.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300012
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Salinity effects on leaf ion composition and salt secretion rate in Avicennia germinans (L.) L. Braz. J. Plant Physiol.
Suárez,Nathalie; Medina,Ernesto.
The effect of salinity on leaf water relations, and rate and ionic composition of leaf secretion was investigated in plants of Avicennia germinans growing under controlled salinity conditions. Increases in salinity from 0 to 940 mol NaCl m-3 reduced the predawn water potential from -0.56 to -4.16 MPa and the solute potential from -2.27 to -4.48 MPa, whereas the pressure potential remained positive in all treatments. Compared to the control, at 940 mol NaCl m-3 Na+ and Cl- concentrations of leaf sap increased 19 and 7 times, respectively. With the addition of salt the main ions accumulated in leaves were Na+ and Cl- whereas plants grown without salt accumulated K+ in leaves at levels similar to those of Na+ with salt treatments. Secretion rates of Na+ and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ion concentration; Mangroves; Na+/K+ ratio; Salt stress; Water relations.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000200005
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Soil Water Potentials and Capsicum annuum L. under Salinity Rev. Bras. Ciênc. Solo
and,Heitor Henrique Félix Duarte; Souza,Edivan Rodrigues de.
ABSTRACT Investigations into water potentials in the soil-plant system are of great relevance in environments with abiotic stresses, such as salinity and drought. An experiment was developed using bell pepper in a Neossolo Flúvico (Fluvent) irrigated with water of six levels of electrical conductivity (0, 1, 3, 5, 7 and 9 dS m-1) by using exclusively NaCl and by simulating the actual condition (using a mixture of salts). The treatments were arranged in a randomized block design, in a 6 × 2 factorial arrangement, with four replicates. Soil matric (Ψm) and osmotic (Ψo) potentials were determined 70 days after transplanting (DAT). Soil total potential was considered as the sum of Ψm and Ψo. Leaf water (obtained with the Scholander Chamber) and osmotic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water relations; Osmotic potential; Bell pepper.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100403
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Stress index, water potentials and leaf succulence in cauliflower cultivated hydroponically with brackish water AGRIAMBI
Cruz,Adiel F. da S.; Silva,Gerônimo F. da; Silva,Ênio F. de F. e; Soares,Hammady R. e; Santos,Jenyffer da S. G.; Lira,Raquele M. de.
ABSTRACT The tolerance of crops to salinity is greater in hydroponic systems due to the low contribution of the matric potential to the total potential of the water. The objective of this study was to evaluate the use of brackish water, to prepare the nutrient solution and replace the evapotranspired volume, and rates of application of this solution on the water stress index, water potential, leaf succulence and water consumption of cauliflower cv. ‘Piracicaba Precoce’. The experimental design was completely randomized in a 6 x 2 factorial scheme, with six salinity levels used to prepare the nutrient solutions (0.2, 1.5, 2.5, 3.5, 4.5 and 5.5 dS m-1) and two application rates of these solutions (1.5 and 2.5 L min-1), with four replicates. Water stress...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water relations; Hydroponics; Salinity.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000900622
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Tolerance to water deficiency between two soybean cultivars: transgenic versus conventional Ciência Rural
Catuchi,Tiago Aranda; Vítolo,Hílton Fabrício; Bertolli,Suzana Chiari; Souza,Gustavo Maia.
The main goal of the study was to evaluate the effects on the development and physiological aspects of soybean plants grown under water deficiency at greenhouse conditions, comparing the levels of tolerance to water deficiency between one transgenic and one conventional cultivar, enabling a systematic way to carried out physiological comparisons between soybean cultivars under drought. The study was divided into completely randomized using a factorial 2×2 design, with five replicates. The experimental design included two replenishment levels of daily irrigation (100% and 40%), applied to the leaves during the V4 developmental stage (fourth trifoliate fully expanded) and two cultivars, 'CD 202' conventional and 'CD 226RR' transgenic. The results showed that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drought; Glycine max; Photosynthesis; Water relations.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000300002
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