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 o C and the T C values estimated. The previous water deficit did not
Highlights
Low water availability and high temperatures are common stressful conditions under field conditions, causing significant reduction in photosynthesis and crop yield (Chaves et al, 2002; Prasad et al, 2011)
Low water availability and high temperatures occur under field conditions and we hypothesize that the critical temperature for photochemical damage (TC) in common bean (Phaseolus vulgaris L.) plants is increased by the occurrence of previous water deficit in a genotype-dependent manner
In this paper we tested the hypothesis that the critical temperature for photochemical damage in common bean is increased by previous water deficit in a genotype-dependent manner
Summary
Low water availability and high temperatures are common stressful conditions under field conditions, causing significant reduction in photosynthesis and crop yield (Chaves et al, 2002; Prasad et al, 2011). Abstract Low water availability and high temperatures occur under field conditions and we hypothesize that the critical temperature for photochemical damage (TC) in common bean (Phaseolus vulgaris L.) plants is increased by the occurrence of previous water deficit in a genotype-dependent manner. Both drought and high temperature may occur simultaneously or alone in nature, with common bean cultivars showing different acclimation to a changing environment (Ribeiro et al, 2004).
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