biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 41:387-394, 1998 | DOI: 10.1023/A:1001898310321

Role of Antioxidant Systems in Wheat Genotypes Tolerance to Water Stress

R.K. Sairam1, P.S. Deshmukh1, D.C. Saxena1
1 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India

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.

Keywords: active oxygen species; ascorbate peroxidase; ascorbic acid; catalase; hydrogen peroxide; oxidative injury; oxidative stress; superoxide dismutase; Triticum aestivum
Subjects: active oxygen species, water stress; antioxidant systems, wheat genotypes; ascorbate peroxidase, water stress; catalase, water stress; oxidative injury, water tolerance; superoxide dismutase, water stress tolerance; Triticum aestivum; water stress tolerance, antioxidants, wheat genotypes

Published: April 1, 1998  Show citation

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Sairam, R.K., Deshmukh, P.S., & Saxena, D.C. (1998). Role of Antioxidant Systems in Wheat Genotypes Tolerance to Water Stress. Biologia plantarum, 41(3), 387-394. doi: 10.1023/A:1001898310321
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