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Type: Artigo
Title: Can the critical temperature for photochemical damage in common bean plants be changed after a drought event?
Author: Ribeiro, Rafael Vasconcelos
dos Santos, Mauro Guida
Pimentel, Carlos
Machado, Eduardo Caruso
de Oliveira, Ricardo Ferraz
Abstract: Low water availability and high temperatures occur under field conditions and we hypothesize that the critical temperature for photochemical damage (T-C) in common bean (Phaseolus vulgaris L.) plants is increased by the occurrence of previous water deficit in a genotype-dependent manner. Five common bean cultivars A320, A222, Carioca, BAT477 and Ouro Negro were evaluated. Thirty days after seedlings emergence, one group of plants was exposed to water deficit for ten days and rehydrated and another one was maintained well hydrated during the experimental period. The minimum chlorophyll fluorescence (F-O) was monitored in leaf discs exposed to temperatures ranging from 25 to 45 degrees C and the T-C values estimated. The previous water deficit did not affect T-C, which varied between 38.8 and 43.8 degrees C when considering all cultivars and water regimes. Under well-watered conditions, BAT477 (41.9 degrees C) and Carioca (43.8 degrees C) presented higher T-C than Ouro Negro (38.8 degrees C). Our findings indicate a significant genotypic variation in thermal tolerance in Phaseolus vulgaris, an important crop trait to be considered in breeding programs
Subject: Feijão
Country: Brasil
Editor: Instituto Agronômico
Rights: Aberto
Identifier DOI: 10.1590/1678-4499.0141
Date Issue: 2015
Appears in Collections:IB - Artigos e Outros Documentos

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