Interplay Between Abscisic Acid and Jasmonic Acid and its Role in Water-oxidative Stress in Wild-type, ABA-deficient, JA-deficient, and Ascorbate-deficient Arabidopsis Plants

The interplay between jasmonic acid (JA) and abscisic acid (ABA) in plant responses to water stress and in water-stress-enhanced oxidative stress was investigated in Arabidopsis thaliana plants subjected to water stress by water deprivation. For this purpose a drought assay was conducted using Arabi...

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Bibliographic Details
Published in:Journal of plant growth regulation 2011-09, Vol.30 (3), p.322-333
Main Authors: Brossa, Ricard, López-Carbonell, Marta, Jubany-Marí, Tana, Alegre, Leonor
Format: Article
Language:English
Subjects:
abscisic acid
acclimation
Acclimatization
Agriculture
antioxidants
Arabidopsis thaliana
Biomedical and Life Sciences
Biosynthesis
Drought
glutathione
jasmonic acid
Life Sciences
mutants
Oxidative stress
plant age
Plant Anatomy/Development
Plant Physiology
Plant Sciences
stomatal movement
Water content
water deprivation
Water stress
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Summary:The interplay between jasmonic acid (JA) and abscisic acid (ABA) in plant responses to water stress and in water-stress-enhanced oxidative stress was investigated in Arabidopsis thaliana plants subjected to water stress by water deprivation. For this purpose a drought assay was conducted using Arabidopsis mutants impaired in ABA (aba2), JA (aos), and ascorbate (vtc1) biosynthesis. Our results show an interaction between ABA and JA during their biosynthesis. Moreover, the coordinated action of ABA and JA protected wild-type, aba2, and aos plants from the effects of stress. However, this effect was not observed in the vtc1 mutant, which showed a distinct decrease in the F v/F m ratio, concomitant with a marked fall in relative water content (RWC), despite high endogenous concentrations of JA and ABA. This finding indicates the relevance of ascorbate metabolism in plant acclimation to stress. Despite the interaction between the two phytohormones, drought-associated stomatal closure is regulated mainly by ABA and weakly by JA, whereas JA plays a role in the formation of antioxidants regulating ascorbate and glutathione metabolism. A time course analysis revealed the relevance of plant age and stress duration in the responses of the mutants compared to wild-type plants. Here we discuss the relationship between ABA, JA, ascorbate, and glutathione in plants under water stress.
ISSN:0721-7595
1435-8107
DOI:10.1007/s00344-011-9194-z