trocas gasosas em folhas de sol e sombreadas de cajueiro anão em diferentes regimes hídricos gas exchange in leaves of sun and shade of cashew in different water regimes

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ID: 176452
2010
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Abstract
Foram analisadas as variações sazonais nas taxas de trocas gasosas em lâminas foliares, sombreadas e a pleno sol, de cajueiro anão precoce (Anacardium occidentale L.), quando submetidas aos regimes de irrigação e de sequeiro. Os clones CCP 76 e BRS 189 foram mensalmente avaliados quanto ao seu desempenho fisiológico em relação à condutância estomática (g s), às taxas transpiratórias (E) e fotossintéticas (A), à temperatura foliar e à relação entre as concentrações interna e externa de CO2 (Ci/Ce). O experimento foi conduzido entre setembro de 2006 e agosto de 2007, na estação experimental da Embrapa Agroindústria Tropical, localizada no município de Paraipaba, Ceará. As variáveis A, g s, E e Ci/Ce foram afetadas apenas em função da época do ano e dos tipos de folhas. A maior influência nos fatores fisiológicos analisados ocorreu devido às condições em que as folhas estavam submetidas (sol ou sombra) e aos fatores meteorológicos e não à supressão da irrigação. Isto, possivelmente porque os resultados aqui obtido estejam mais bem relacionados com as fases fenológicas da cultura do que com os tratamentos, demonstrando assim o conspícuo efeito fisiológico da força dos drenos e da irradiância nessas plantas.
In this experiment we analyzed the seasonal variations in gas exchange rates of dwarf cashew (Anacardium occidentale L.) when exposed to irrigated and rainfed conditions. Full sun and shaded of clones CCP 76 and BRS 189 were monthly assessed for determination of stomatal conductance (g s), transpiration rate (E) and photosynthesis (A), internal and external CO2 (Ci/Ce) and leaf temperature. The experiment was carried out between September 2006 and August 2007, at the experimental station of Embrapa Agroindústria Tropical, located at Paraipaba County, state of Ceará, Brazil. In general, the variables A, g s, E and Ci/Ce were affected only in terms of time of year and types of leaves. Light influenced the physiological factors rather than suppression of water. Possibly because the results obtained here are better related to the phenological stages than with the treatments, demonstrating a conspicuous physiological effect of the strength of the drains and the irradiance in these plants.
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Authors ;Michella de Albuquerque Lima;Marlos Alves Bezerra;Enéas Gomes Filho;Ciro de Miranda Pinto;Joaquim Enéas Filho
Journal international journal of computer games technology
Year 2010
DOI
10.1590/S1806-66902010000400020
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000400020
Keywords
water stress

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