Bulletin of the Faculty of Life and Environmental Science Shimane University

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Bulletin of the Faculty of Life and Environmental Science Shimane University 16
2011-09-30 発行

Effect of tryptamine on the infection behavior of Corynespora cassiicola

Haida, Ami
Morio, Kengo
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Description
Antifungal activity of tryptamine was tested using a causal agent, Corynespora cassiicola, of Corynespora leaf spot of cucumber. Tryptamine inhibited spore germination of C. cassiicola at dosage of over1250μg/mL. When cucumber plants(Cucumis sativus L. cv. Hokushin)at the2?leaf stage were inoculated with C. cassiicola in the presence of tryptamine(2500μg/mL), Corynespora leaf spot formation was significantly inhibited. Phytotoxicity was not observed even by tryptamine treatment at2500μg/mL. Furthermore, tryptamine inhibited Corynespora leaf spot lesion formation in other cucumber cultivars. These results suggest that use of exogenous or endogenous tryptamine in cucumber contributes to protection of many diseases of cucumber.