Role of Antioxidant Systems in Wheat Genotypes Tolerance to Water Stress |
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Authors: | RK Sairam PS Deshmukh DC Saxena |
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Institution: | (1) Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110 012, India |
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Abstract: | The role of plant antioxidant systems in stress tolerance was studied in leaves of three contrasting wheat genotypes. Drought
imposed at two different stages after anthesis resulted in an increase in H2O2 accumulation and lipid peroxidation and decrease
in ascorbic acid content. Antioxidant enzymes like superoxide dismutase, ascorbate peroxidase and catalase significantly increased
under water stress. Drought tolerant genotype C 306 which had highest ascorbate peroxidase and catalase activity and ascorbic
acid content also showed lowest H2O2 accumulation and lipid peroxidation (malondialdehyde content) under water stress in comparison
to susceptible genotype HD 2329 which showed lowest antioxidant enzyme activity and ascorbic acid content and highest H2O2
content and lipid peroxidation. HD 2285 which is tolerant to high temperature during grain filling period showed intermediate
behaviour. Superoxide dismutase activity, however, did not show significant differences among the genotypes under irrigated
as well as water stress condition. It seems that H2O2 scavenging systems as represented by ascorbate peroxidase and catalase
are more important in imparting tolerance against drought induced oxidative stress than superoxide dismutase alone.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | active oxygen species ascorbate peroxidase ascorbic acid catalase hydrogen peroxide oxidative injury oxidative stress superoxide dismutase Triticum aestivum |
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