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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| Published in | Emirates Journal of Food and Agriculture Vol. 25; no. 12; p. 1002 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Sofia
Pensoft Publishers
01.12.2013
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| Subjects | |
| Online Access | Get full text |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | PhamThi, AnhThu ScottiCampos, Paula Semedo, Jos Ramalho, Jos Pais, Isabel Matos, Maria |
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| Copyright | Copyright United Arab Emirates University Dec 2013 |
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| SubjectTerms | Abscisic acid Drought Electrolytes Enzymes Lipids Membranes Metabolism Nitrogen Permeability Physiology Polyethylene glycol |
| Title | Physiological responses and membrane integrity in three Vigna genotypes with contrasting drought tolerance |
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