Plant water status, H2O2 scavenging enzymes, ethylene evolution and membrane integrity of Cicer arietinum roots as affected by salinity
Kukreja, S.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology) | Nandwal, A.S.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology) | Kumar, N.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology) | Sharma, S.K.(Haryana Agricultural Univ., Hisar (India). Dept. of Soil Science) | Sharma, S.K.(Central Soil Salinity Research Inst., Karnal (India)) | Unvi, V.(Haryana Agricultural Univ., Hisar (India). Central Lab.) | Sharma, P.K.(Central Soil Salinity Research Inst., Karnal (India))
Chickpea plants were exposed to single saline irrigation (0, 2.5, 5.0 and 10.0 dS/m) in order to study salinity induced changes in ethylene evolution, antioxidative defence system and membrane integrity in relation to changes in plant water and mineral concentrations. The increase in salinity led to a decrease in water and osmotic potentials as well as relative water content, and to an increase in ethylene evolution, H2O2 and 1-aminocyclopropane-1-carboxylic acid (ACC) concentrations, ACC oxidase activity and lipid peroxidation. The defense mechanism activated in roots was confirmed by the increased activities of superoxide dismutase, peroxidase, ascorbate peroxidase, glutathione transferase, glutathione reductase and catalase. Ascorbic acid concentration decreased. About 3-fold increase in Na+/K+ ratio and 2.5 fold increase in Cl- content were observed. After desalinization, a partial recovery was observed in most of the parameters studied.
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