We studied the effects of high temperature and paraquat on the rate of lipid peroxidation and activity of the H+-ATPase in the plasmalemma fraction isolated from pea leaves. We demonstrated a heat-induced increase in both indices. When lipid-peroxidation was inhibited by pretreatment with butylated hydroxytoluene, a synthetic antioxidant, the H+-ATPase activity increased to a lesser extent than after heat shock without pretreatment. Treatment of plants with paraquat, a prooxidant causing an oxidative stress, resulted in a dramatic increase in lipid peroxidation and H+-ATPase activity. We suggested that the enhanced lipid peroxidation could be one of the causes for the H+-ATPase activation in the plasmalemma under stress conditions.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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