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Title: Leaf gas exchange and ABA accumulation in Phaseolus vulgaris genotypes of contrasting drought tolerance

Drought tolerance mechanisms in Phaseolus vulgaris (Pv) are still largely unknown. Gas exchange responses and ABA accumulation were monitored in Pv genotypes differing in their drought adaptation. Higher rates of photosynthesis were observed under well-watered conditions in drought sensitive genotypes. Water stress caused a significant reduction in leaf water potential and photosynthetic rates regardless of drought adaptation. Higher photosynthetic rates were maintained under stress conditions in one drought tolerant genotype. Interestingly water stress caused significant ABA accumulation only in this genotype. Root ABA levels were similar among genotypes and were not modified by water stress. Endogenous levels of free ABA in leaves and roots did not correlated with gas exchange response to water stress. These results differ from previous reports on genotypic variation in ABA accumulation under water stress.
Authors:
; ;  [1]
  1. (Agriculture Canada, Ste-Foy, Quebec (Canada))
Publication Date:
OSTI Identifier:
5561203
Report Number(s):
CONF-9107184--
Journal ID: ISSN 0079-2241; CODEN: PPYSA
Resource Type:
Conference
Resource Relation:
Journal Name: Plant Physiology, Supplement; (United States); Journal Volume: 96:1; Conference: Annual meeting of the American Society of Plant Physiology, Albuquerque, NM (United States), 28 Jul - 1 Aug 1991
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; ABSCISIC ACID; BIOLOGICAL ACCUMULATION; DROUGHTS; ENVIRONMENTAL EFFECTS; PLANTS; BIOLOGICAL STRESS; BIOLOGICAL ADAPTATION; GENOTYPE; LEAVES; PHOTOSYNTHESIS; ROOTS; TOLERANCE; AUXINS; CARBOXYLIC ACIDS; CHEMICAL REACTIONS; MONOCARBOXYLIC ACIDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANT GROWTH REGULATORS; SYNTHESIS 551000* -- Physiological Systems