biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 43:245-251, 2000 | DOI: 10.1023/A:1002756311146

Increased Antioxidant Activity under Elevated Temperatures: A Mechanism of Heat Stress Tolerance in Wheat Genotypes

R.K. Sairam1, G.C. Srivastava1, D.C. Saxena1
1 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi -, India

An experiment was conducted with three wheat (Triticum aestivum L.) genotypes C 306, HD 2285 and HD 2329 (differently susceptible to water and temperature stress) to study the extent of oxidative injury and activities of antioxidant enzymes in relation to heat stress induced by manipulating dates of sowing. Increase in temperature by late sowing significantly decreased leaf relative water content (RWC), ascorbic acid content, and increased H2O2 content and lipid peroxidation in all the genotypes at 8 and 23 d after anthesis. Temperature tolerant genotypes C 306, closely followed by HD 2285 were superior to HD 2329 in maintaining high RWC, ascorbic acid content, and lower H2O2 content and lipid peroxidation (malondialdehyde content) under high temperature (late sowing) at the two stages. Activities of superoxide dismutase and catalase were highest in HD 2285 followed by C 306 and minimum in HD 2329 while ascorbate peroxidase activity was highest in C 306.

Keywords: ascorbic acid; ascorbate peroxidase; active oxygen species; catalase; hydroger; peroxide; oxidative stress; superoxide dismutase; temperature stress; Triticum aestivum
Subjects: antioxidant activity, elevated temperature; ascorbate peroxidase, heat stress; ascorbic acid, heat stress; heat stress tolerance; hydrogen peroxide, heat stress; oxidative stress, heat stress; oxygen species, active, heat stress; superoxide dismutase, heat stress; temperature, stress tolerance; Triticum aestivum; wheat genotypes, heat stress

Published: August 1, 2000  Show citation

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Sairam, R.K., Srivastava, G.C., & Saxena, D.C. (2000). Increased Antioxidant Activity under Elevated Temperatures: A Mechanism of Heat Stress Tolerance in Wheat Genotypes. Biologia plantarum, 43(2), 245-251. doi: 10.1023/A:1002756311146
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