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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 root variations in response to water deficit: wild and domesticated common bean (Phaseolus vulgaris L) Biol. Res.
Peña-Valdivia,Cecilia B; Sánchez-Urdaneta,Adriana B; Meza Rangel,Joel; Juárez Muñoz,Juana; García-Nava,Rodolfo; Celis Velázquez,Raquel.
Root anatomical responses to water deficit are diverse and regulation of water uptake strongly depends on plant anatomy. The ancestors of common bean (Phaseolus vulgaris L.) cultivars are the wild common beans. Because wild beans adapt and survive well in theon atural environment, it is hypothesized that wild common bean roots are less affected than those of domesticated beans at low substrate water potential (ψW). A wild common bean accession from Chihuahua Mexico and cv. Bayomex were studied. Seedlings with a mean root length between 3 and 4 cm were maintained for 24 h in vermiculite at ψW of -0.03 (well hydrated), -0.65, -1.48 and -2.35 MPa (partially dry). Ten anatomical characteristics of differentiation and cell division in root...
Tipo: Journal article Palavras-chave: Endodermis; Protoderm; Seedlings; Water potential; Xylem.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400006
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Comportamento estomático de Coffea canephora em condições de Cerrado. Repositório Alice
MATOS, N. M. S. de; PEREIRA, F. A. C.; MENDES, A. N. G.; CARVALHO, M. A. de F.; RODRIGUES, G. C.; VEIGA, A. D.; MARRACCINI, P.; BARTHOLO, G. F..
Objetivou-se com o presente estudo, analisar o comportamento estomático ao longo do dia de genótipos de Coffea canephora após o período de suspensão hídrica imposto no sistema de irrigação do Cerrado. Avaliou-se no ano de 2017 genótipos existentes no Banco Ativo de Germoplasma localizado na Empresa Brasileira de Pesquisa Agropecuária (Embrapa Cerrados), Planaltina-DF. Foram utilizados seis genótipos da espécie Coffea canephora, sendo 4 indivíduos selecionados de uma população de melhoramento da Embrapa Cerrados (8, 114, 30 e 125) e dois clones com características contrastantes de tolerância à seca (14 ? tolerante e 22 - sensível) (FERRÃO et al., 1999). O plantio foi realizado em linhas, por material, utilizando um espaçamento de 3,7 x 1,0 m em sistema...
Tipo: Anais e Proceedings de eventos Palavras-chave: Condutância estomática; Suspensão hídrica; Genótipo de café; Hydric suspension; Coffee genotypes; Potencial Hídrico; Stomatal conductance; Water potential.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114241
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Contribuicao hidrica do cerrado para as grandes bacias hidrograficas brasileiras. Infoteca-e
LIMA, J. E. F. W.; SILVA, E. M. da.
bitstream/CPAC-2009/24358/1/p2002_21.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: ECAGUA100; Brasil; Savanna.; Bacia Hidrográfica; Cerrado; Manejo de Água; Potencial Hídrico; Recurso Hídrico.; Brazil; Water potential; Water resources; Water management; Watersheds..
Ano: 2004 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567621
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Cultivares de algodoeiro herbáceo sob déficit hídrico aplicado em fases fenológicas. Repositório Alice
CORDÃO, M. A.; ARAÚJO, W. P.; PEREIRA, J. R.; ZONTA, J. H.; LIMA, R. F. de; FERREIRA, F. N..
Para o uso do recurso água na agricultura procura-se uma maior eficiência devido á escassez em determinadas regiões. Objetivou-se avaliar o efeito do déficit hídrico, aplicado em diferentes fases fenológicas, sobre o crescimento, fisiologia e produção das cultivares BRS 286 e BRS 336 de algodoeiro herbáceo. O delineamento experimental foi blocos casualizados em parcelas subdivididas, com os seis regimes de déficits hídricos, aplicados em diferentes fases fenológicas do algodoeiro, formando as parcelas e, as duas cultivares de algodoeiro herbáceo, as subparcelas, em 4 repetições. Foram avaliadas as variáveis de crescimento, fisiológicas e produtividade de algodão em caroço do algodoeiro herbáceo. O déficit hídrico restringiu o crescimento de ambas as...
Tipo: Artigo de periódico Palavras-chave: Balanço Hídrico; Potencial Hídrico; Deficiência Hídrica; Gossypium Hirsutum; Water balance; Water potential; Soil water deficit.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107098
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Deterioração, endurecimento e anormalidades em sementes e plântulas de algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium H.) sob estresse hídrico. Repositório Alice
PEREIRA, J. R.; FERNANDES, P. D.; BELTRAO, N. E. de M..
Resumo: Conduziu-se um experimento em laboratório, com o objetivo de se estudar o comportamento germinativo de sementes de 10 genótipos de algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium H.) de fibras médias, de promissora potencialidade produtiva e tecnológica, e identificar os mais e os menos sensíveis em baixos níveis de potencial osmótico (0.0, -0.2, -0.4, -0.6, -0.8 e -1.0MPa), simulados por polietileno glicol-6000; foi utilizado papel Germitest, num delineamento inteiramente casualizado, em esquema fatorial 10 x 6, com 4 repetições, cada uma contendo 50 sementes. Foram verificadas diferenças de comportamento entre os genótipos de algodoeiro herbáceo estudados nos diversos níveis de estresse hídrico; a percentagem de sementes deterioradas e...
Tipo: Artigo de periódico Palavras-chave: Drought simulation; PEG-6000; Algodão; Germinação; Gossypium Hirsutum; Potencial Hídrico; Semente; Cotton; Germination; Water potential; Seeds..
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/270598
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Different molecular mechanisms account for drought tolerance in Coffea canephora var. Conilon. Repositório Alice
VIEIRA, N. G.; CARNEIRO, F. A.; SUJII, P. S.; ALEKCEVETCH, J. C.; FREIRE, L. P.; VINECKY, F.; ELBELT, S.; SILVA, V. A.; MATTA, F. M. da; FERRAO, M. A. G.; MARRACCINI, P.; ANDRADE, A. C..
Tipo: Separatas Palavras-chave: Candidate gene; Real-time quantitative PCR; Coffea Canephora; Drought; Gene expression; Water potential.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/974852
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Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species Gayana Botánica
Bascuñán-Godoy,Luisa; Alcaíno,Claudia; Carvajal,Danny Eduardo; Sanhueza,Carolina; Montecinos,Sonia; Maldonado,Antonio.
Myrceugenia exsucca (DC.) O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray (Myrtaceae) are two predominants species from swamp forests of Chile. These species present differential microhabitat distribution across soil moisture and north-south precipitation gradients, with only L. chequen being commonly found in lower moisture sites. It is hypothesized that L. chequen has greater plasticity than M. exsucca in the attributes involved in photoprotection under drought conditions. To test this hypothesis: both species were exposed to short term drought treatment. A group of individuals was maintained irrigated (with <img border=0 width=41 height=36 id="_x0000_i1084" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg"...
Tipo: Journal article Palavras-chave: Thermal dissipation; Water potential; Native plants; Myrtaceae family; Wetland plants.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200008
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Drought Research Priorities for the Dryland Tropics Open Agri
F.R..
Palavras-chave: Crops; Soil water; Transpiration (animals); Water balance; Weather hazards; Drought stress; Harvest index; Leaf area; Water potential.
Ano: 1988 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4045
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Ecophysiological studies of two andean forest contrasting species Abatia parviflora and Myrcianthes leucoxyla under Bogotá conditions, Colombia Braz. J. Plant Physiol.
Colmenares-Trejos,Sara L.; Melgarejo,Luz Marina; Romero A.,Hernán Mauricio.
The physiological response of high Andean forest contrasting plants, Myrcianthes leucoxyla, a shadow-facultative heliophyte, and Abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in Bogotá. Light response curves (A-PAR), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), leaf soluble protein content and peroxidase activity were measured in this study in a 48h cycle. The values for E, gs, Ψw and Ψw predawn for M. leucoxyla were 0.07 to 4.89 µg/cm s, 0.02 to 0.5 cm s-1, -0.025 to -1.05 MPa, and-0.1 MPa, respectively. For A. parviflora E, gs, Ψw and Ψw predawn were 0.47 to 12.27 µg/cm s, 0.17 to 1.42 cm s-1, -0.05 to -0.3 MPa and -0.075 MPa, respectively. A. parviflora presented a tendency...
Tipo: Info:eu-repo/semantics/article Palavras-chave: A-PAR curves; Gas exchange; Heliophyte; Shadow plant; Water potential.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400008
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Ecophysiology of coconut palm under water stress Braz. J. Plant Physiol.
Gomes,Fábio P.; Prado,Carlos H.B.A..
Coconut palm is of great social and economic importance for millions of people in the tropics and subtropics. Drought is one of the main environmental factors that limit coconut productivity. In this review, physiological and morphological data are presented in an integrated perspective to provide a holistic view of the behavior of coconut trees facing water deficit under both field and controlled conditions. Great capacity to produce homorhizic roots capable of searching continuously for water and nutrients and high protoplasmic tolerance in leaves allows the coconut tree to endure water deficit. High membrane stability, osmoprotection, osmoregulation and enhanced activity of antioxidant enzymes are characteristics often found in leaves of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cocus nucifera; Desiccation tolerance; Leaf gas exchange; Leaf water relations; Net photosynthesis; Osmotic potential; Water potential; Water-use efficiency.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400008
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Ecophysiology of tea Braz. J. Plant Physiol.
De Costa,W.A. Janendra M.; Mohotti,A. Janaki; Wijeratne,Madawala A..
Tea [Camellia sinensis (L.) O. Kuntze] is one of the most important beverage crops in the world. The major tea-growing regions of the world are South-East Asia and Eastern Africa where it is grown across a wide range of altitudes up to 2200 m a.s.l.. This paper reviews the key physiological processes responsible for yield determination of tea and discusses how these processes are influenced by genotypic and environmental factors. Yield formation of tea is discussed in terms of assimilate supply through photosynthesis and formation of harvestable sinks (i.e. shoots). The photosynthetic apparatus and partial processes (i.e. light capture, electron transport and carboxylation) of tea show specific adaptations to shade. Consequently, maximum light-saturated...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate change; Photoinhibition; Photosynthesis; Shoot growth; Temperature; Vapour pressure deficit; Water potential.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400005
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Effect water activity on in vitro mycelial growth of Neofusicoccum spp. infecting blueberry Ciencia e Investigación Agraria
Latorre,Bernardo A; Díaz,Gonzalo A; Reed,María P.
Stem canker in blueberries (Vaccinium corymbosum L.) is a disease which is widely distributed around the world and of growing importance in Chile, associated with Neofusicoccum species. The purpose of the present work was to study the effects of water activity (a w) and temperature on mycelial growth in vitro of N. arbuti, N. australe and N. parvum, obtained from blueberries with symptoms of stem canker. According to the results obtained, 25 °C was the optimum temperature for mycelial growth of N. arbuti, N. australe and N. parvum. These species presented minimal growth at 35 °C and none at 0 and 5 °C. The effect of a w on mycelial growth was significant (P&#8804;0.001) and varied with the species of Neofusicoccum and the temperature. At 25 °C, the...
Tipo: Journal article Palavras-chave: Ecological determinants; Neofusicoccum arbuti; Neofusicoccum australe; Neofusicoccum parvum; Stem canker; Dieback; Vaccinium; Water potential.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100019
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Electrical conductivity and soybean seedling emergence Scientia Agricola
Colete,Julio Cesar Fachini; Vieira,Roberval Daiton; Dutra,Alek Sandro.
Evaluation of soybean [Glycine max (L.) Merrill] seeds vigor and its relation with field seedling emergence can provide secure indicatives of seed physiological potential. The present research studied the relationship between the electrical conductivity test and the seedling emergence of soybean in field and laboratory. The field experiment was sown in November 26th, December 3td and 10th, 2000. Laboratory tests were performed using levels of water potential in the substrate (soil) -0.03; -0.2; -0.4; and -0.6 MPa. Fourteen seed lots, seven of 'Embrapa 48' and seven of 'BRS 133' soybean cultivars were used. Laboratory tests comprised seed water content determination, before and after the accelerated aging; germination and vigor tests (accelerated aging and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Seed analysis; Water content; Vigor; Water potential.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400006
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Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000 Scientia Agricola
Meneses,Carlos Henrique Salvino Gadelha; Bruno,Riselane de Lucena Alcântara; Fernandes,Pedro Dantas; Pereira,Walter Esfrain; Lima,Leonardo Henrique Guedes de Morais; Lima,Marleide Magalhães de Andrade; Vidal,Márcia Soares.
The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gossypium hirsutum var. latifolium L.; PEG-6000; Vigor; Water potential.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200001
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Growth evaluation and water relations of Erythrina velutina seedlings in response to drought stress Braz. J. Plant Physiol.
Silva,Elizamar Ciríaco da; Silva,Marcos F. A.; Nogueira,Rejane J. M. C.; Albuquerque,Manoel B..
Erythrina velutina Willd. (common name: mulungu) is a deciduous, heliophyte found in the semi-arid region of northeastern Brazil. To evaluate the growth and water relations of mulungu seedlings in soils with different degrees of moisture content, an experiment was carried out under greenhouse conditions using four water treatments (100%, 75%, 50% and 25% of the field capacity- FC). Predawn (Ψpdw) and midday leaf water potential (Ψmdw), relative water content (RWC), plant height, number of leaves, stem diameter, leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), dry matter in different organs, biomass partitioning and root:shoot ratio were evaluated. No differences were detected between treatments for Ψpdw after 30 days; however, at midday,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass allocation; Dry matter; Leaf area; Root to shoot ratio; Relative water content; Water potential.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400002
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Impact of management interventions on the performance of five irrigation schemes in Sri Lanka AgEcon
Imbulana, K.A.U.S.; Merrey, Douglas J..
This working paper is the outcome of a data collection process initiated under the advice of Dr. Shigeo Yashima of the International Irrigation Management Institute (IIMI). The objective of this data collection process was to make a preliminary assessment of irrigation performance in Sri Lanka using irrigation systems with different backgrounds to identify areas for further research.
Tipo: Working or Discussion Paper Palavras-chave: Irrigation programs; Performance evaluation; Irrigation management; Intervention; Irrigation systems; Monitoring; Performance indexes; History; Farmers associations; Farmer participation; Farmer-agency interactions; Communication; Organizations; Water potential; Rice; Crop yield; Water supply; Land productivity; Rain; Data collection; Farm Management; Institutional and Behavioral Economics; Land Economics/Use.
Ano: 1995 URL: http://purl.umn.edu/113609
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Impact of management interventions on the performance of five irrigation schemes in Sri Lanka AgEcon
Imbulana, K. A. U. S.; Merrey, D. J..
This working paper is the outcome of a data collection process initiated under the advice of Dr. Shigeo Yashima of the International Irrigation Management Institute (IIMI). The objective of this data collection process was to make a preliminary assessment of irrigation performance in Sri Lanka using irrigation systems with different backgrounds to identify areas for further research.
Tipo: Working or Discussion Paper Palavras-chave: Irrigation programs; Performance evaluation; Performance indexes; Irrigation systems; Farmers associations; Farmer participation; Farmer-agency interactions; Water potential; Rice; Crop yield; Land productivity; Data collection; Crop Production/Industries; Farm Management; Land Economics/Use.
Ano: 1995 URL: http://purl.umn.edu/113605
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Increased Growth and Changes in Wheat Mineral Composition through Calcium Silicate Fertilization under Normal and Saline Field Conditions Chilean J. Agric. Res.
Anser,Ali; Basra,Shahzad M.A; Hussain,Safdar; Iqbal,Javaid.
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Tipo: Journal article Palavras-chave: Salt stress; Silicon; Wheat growth; K+:Na+; Water potential; Stomatal conductance.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100016
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Irrigation management in Latin America: present situation, problem areas and areas of potential improvement AgEcon
International Irrigation Management Institute (IIMI).
Tipo: Book Palavras-chave: Irrigation management; Water potential; Irrigation systems; Social aspects; Economic aspects; Water users associations; Farm Management; Institutional and Behavioral Economics.
Ano: 1990 URL: http://purl.umn.edu/113951
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