Physiological responses and membrane integrity in three Vigna genotypes with contrasting drought tolerance

In this paper, some dehydration-induced responses at whole plant and cellular levels were evaluated in three Vigna genotypes from different origins. Changes in leaf stomatal conductance, membrane lipids composition and abscisic acid (ABA) content were determined under water stress. Membrane integrit...

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Bibliographic Details
Published inEmirates Journal of Food and Agriculture Vol. 25; no. 12; p. 1002
Main Authors ScottiCampos, Paula, PhamThi, AnhThu, Semedo, Jos, Pais, Isabel, Ramalho, Jos, Matos, Maria
Format Journal Article
LanguageEnglish
Published Sofia Pensoft Publishers 01.12.2013
Subjects
Abscisic acid
Drought
Electrolytes
Enzymes
Lipids
Membranes
Metabolism
Nitrogen
Permeability
Physiology
Polyethylene glycol
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Summary:In this paper, some dehydration-induced responses at whole plant and cellular levels were evaluated in three Vigna genotypes from different origins. Changes in leaf stomatal conductance, membrane lipids composition and abscisic acid (ABA) content were determined under water stress. Membrane integrity was assessed through leaf discs dehydration with polyethylene glycol, and expressed as an injury index. In EPACE-1 and 1183, rapid stomatal closure at early stages of dehydration was related with the ability to accumulate endogenous ABA. In 1,183, high I% values occurred in PEG-dehydrated discs, and lipid degradation was observed even under moderate water stress, becoming significant under more severe drought. Vg and EPACE-1 presented lower I% values, probably denoting the ability to preserve membrane integrity. It is suggested that a higher protoplasmic tolerance in EPACE-1 and Vg might be related to stable and low endogenous ABA contents under increasing water deficit.
ISSN:2079-052X
2079-0538
DOI:10.9755/ejfa.v25i12.16733