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| Studies on Resistance of Pumpkin Seedlings to Phytophthora capsici by Exogenous 24-Epibrassinolide Treatment |
| Qu Shuping,Wang Lili,Cui Chongshi |
| (College of Horticulture,Northeast Agricultural University,Harbin 150030) |
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Abstract The induced resistance of pumpkin seedlings to Phytophthora capsici and its physiological mechanism were studied by 24-Epibrassinolide with foliar spray.The results showed that 24-Epibrassinolide increased H2O2 content,decreased MDA content,improved catalase(CAT)activities,peroxidase(POD)activities first decreased slowly then increased.After inoculated by Phytophthora capsici，the disease index of pumpkin seedlings decreased by 29 %,the contents of H2O2 and MDA increased slowly when plants were sprayed with EBR first,but the MDA content and POD activity were remarkably lower than CP treatment，CAT activity was significantly higher than CP treatment.EBR evidently promoted the growth of pumpkin seedling,the plant growth vigor was also stronger than CP treatment even during Phytophthora capsici infection.EBR kept the metabolism of active oxygen at a balanced level and increased pumpkin resistance to Phytophthora capsici.
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Received: 23 January 2008
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