Biological activities of rishitin, an antifungal compound isolated from diseased potato tubers, and its derivatives

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書誌事項

公開日
1969-03
公開者
Japanese Society of Plant Physiologists

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説明

Rishitin, a norsesquiterpene alcohol, found in infected, resistant potato-tuber tissue completely inhibited zoospore germination and germtube elongation of Phytophthora infestans (MONT) DE BARY at 10^<-3>M. There was little difference in sensitivity to rishitin among races of Phytophthora infestans. IAA-induced elongation of Avena coleoptile sections and GA_3-induced elongation of wheat leaf sections were also inhibited by rishitin. The inhibition of IAA-induced elongation of Avena coleoptiles was relieved to some extent by increasing IAA concentration. However, little relief of the inhibition of GA_3-induced elongation of wheat leaf sections was obtained by increasing GA_3 concentration. No plant injury was observed ~t this concentration of rishitin (10^<-3>M). Examination of a series of rishitin derivatives indicated that the hydroxyl group at C-3 is indispensable for antifungal activity. This activity was intensified by saturating the double bond between the rings of rishitin and/or that of the isopropenyl group at C-7, though activity decreased when oxygenated functional groups were introduced into the side chain. Aromatization of the A ring did not lower biological activities. The anti-fungal activities of most rishitin derivatives almost paralleled their activities as plant growth retardants. However, some compounds without antifungal activity were active as growth retardants.

収集根拠 : NII-ELS
資料形態 : テキストデータ
コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会
著者所属: Hokkaido Agricultural Experiment Station
著者所属: Department of Chemistry, Hokkaido University

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