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  • Author or Editor: A. B. Galbraith x
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Abstract

Cucumber (Cucumis sativus L. cv. Marketer) seedlings were treated with 100 μg of soil-applied uniconazole and then exposed to 22 or − 1C for 8 hours 1 week following treatment. Following exposure to − 1C, electrolyte leakage from leaf tissue of treated plants was about one-third that of the controls, indicating that uniconazole reduced low-temperature damage. Foliar proline content was unaffected by uniconazole at 22C, but, following low temperature exposure, was ≈25% less in treated than in control plants. Following low-temperature exposure, malondialdehyde content was ≈25% less in treated seedlings than in controls, suggesting that uniconazole may have decreased low temperature-induced lipid peroxidation. Uniconazole-induced low-temperature tolerance was accompanied by increased levels or activities of various antioxidants, including glutathione, peroxidase, and catalase. These results are consistent with the hypothesis that triazole-induced stress tolerance is due, at least in part, to increased antioxidant activity that reduces stress-related oxidative damage to cell membranes. Chemical names used: γ-L-glutamyl-L-cysteinyl-glycine (glutathione); (E)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)penten-3-ol (uniconazole, XE-1019).

Open Access