Data/hora: 11/06/2024 14:49:32

Provedor de dados: | 61
País: | Brazil
Título: | Asymmetrical leaves induced by water deficit show asymmetric photosynthesis in common bean
Autores: | Souza,Gustavo Maia; Viana,Juliana de Oliveira Fernandes; Oliveira,Ricardo Ferraz de.
Data: | 2005-06-01
Ano: | 2005
Palavras-chave: | Developmental instability; Leaf symmetry; Water deficit.
Resumo: | In this study we tested the hypothesis that leaf asymmetric growth induced by water deficit in common bean (Phaseolus vulgaris L.) might be correlated with different net photosynthesis rates between the two opposed leaflets (right and left) considering a bilateral symmetric plane. In order to induce developmental instability, the drought-sensitive common bean genotype "Jalo Precoce" was subjected to periods of suspended irrigation during its vegetative growth. Developmental instability was evaluated by measurements of leaflets asymmetry, and the effects of drought on gas exchanges were taken in both symmetrical leaflets (right and left) in relation to the central leaflet. Water deficit induced an increase of 80 % in leaf asymmetry. Net photosynthesis of P. vulgaris was affected by water deficit in two ways, reducing its physiological yield and increasing its variability between leaflets. Thus, as we hypothesized, the increase in developmental instability, measured by leaf symmetry deviations, was supported by a variable net photosynthesis distribution in the leaves induced by drought.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200005
Editor: | Brazilian Journal of Plant Physiology
Relação: | 10.1590/S1677-04202005000200005
Formato: | text/html
Fonte: | Brazilian Journal of Plant Physiology  v.17 n.2 2005
Fonte: | info:eu-repo/semantics/openAccess