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Triazole induced drought tolerance in horse chestnut (Aesculus hippocastanum)

Percival, G. C. and Noviss, K. (2008) Triazole induced drought tolerance in horse chestnut (Aesculus hippocastanum). Tree Physiology, 28 (11). pp. 1685-1692. ISSN 0829-318X

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We determined the influence of the triazole derivatives paclobutrazol, penconazole, epixiconazole, propiconazole and myclobutanil on the drought tolerance and post drought recovery of container-grown horse chestnut (Aesculus hippocastanum L.) saplings. Myclobutanil neither conferred drought resistance, as assessed by its effects on a number of physiological and biochemical parameters, nor affected growth parameters measured after recovery from drought. Chlorophyll fluorescence (F,IF,,), photosynthetic rates, total foliar chlorophyll and carotenoid concentrations, foliar proline concentration and superoxide dismutase and catalase activities were consistently higher and leaf necrosis and cellular electrolyte leakage was lower at the end of a 3-week drought in trees treated with paclobutrazol, penconazole, epixiconazole or propiconazole than in control trees. Twelve weeks after drought treatment, leaf area and shoot, root and total plant dry masses were greater in triazole-treated trees than in control trees with the exception of those treated with myclobutanil. In a separate Study, trees were subjected to a 2-week drought and then sprayed with paclobutrazol, penconazole, epixiconazole, propiconazole or myclobutanil. Chlorophyll fluorescence, photosynthetic rate, foliar chlorophyll concentration and catalase activity over the following 12 weeks were 20 to 50% hi-her in triazole-treated trees than in control trees. At the end of the 12-week recovery period, leaf area and shoot, root and total plant dry masses were higher in triazole-treated trees than in control trees, with the exception of trees treated with myclobutanil. Application of triazole derivatives, with the exception of myclobutanil, enhanced tolerance to prolonged drought and, when applied after a 2-week drought, hastened recovery from drought. The magnitude of treatment effects was in the order epixiconazole approximate to propiconazole > penconazole > paclobutrazol > myclobutanil.

Item Type:Article
Divisions:Life Sciences > School of Biological Sciences
ID Code:9872
Uncontrolled Keywords:carotenoids, chlorophyll fluorescence, chlorophylls, electrolyte, leakage, fungicides, growth inhibitor, physiogenic stress, proline, transplanting, CATHARANTHUS-ROSEUS, CHLOROPHYLL FLUORESCENCE, ANTIOXIDANT METABOLISM, AJMALICINE PRODUCTION, WHEAT SEEDLINGS, WATER-DEFICIT, PACLOBUTRAZOL, STRESS, GROWTH, PHOTOSYNTHESIS

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