Journal
PLANT GROWTH REGULATION
Volume 48, Issue 2, Pages 137-144Publisher
SPRINGER
DOI: 10.1007/s10725-005-6146-2
Keywords
antioxidant enzymes; H2O2; heat acclimation; salicylic acid; thermotolerance; Vitis vinifera
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Thermotolerance and related antioxidant enzyme activities induced by both heat acclimation and exogenous salicylic acid (SA) application were studied in grapevine (Vitis vinifera L. cv. Jingxiu). Heat acclimation and exogenous SA application induced comparable changes in thermotolerance, ascorbic acid (AsA), glutathione (GSH), and hydrogen peroxide (H2O2) concentrations, and in activities of the antioxidant enzymes superoxide dismutase (SOD), peroxidase (POD), glutathione reductase (GR), ascorbic peroxidase (APX) and catalase (CAT) in grape leaves. Within 1 h at 38 degrees C, free SA concentration in leaves rose from 3.1 mu g g(-1)supercript stop FW to 19.1 mu g g(-1) FW, then sharply declined. SA application and heat acclimation induced thermotolerance were related to changes of antioxidant enzyme activities and antioxidant concentration, indicating a role for endogenous SA in heat acclimation in grape leaves.
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