健全エンバク葉に存在するさび菌発育阻害物質

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  • Growth inhibitors of rust fungi detected in healthy oat leaves.
  • 健全エンバク葉に存在するさび菌発育阻害物質〔英文〕
  • ケンゼン エンバク ヨウ ニ ソンザイスル サビキン ハツイク ソガイ ブッシ

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Two antifungal steroids were isolated from the water homogenate of oat primary leaves and were identified as 26-desglucoavenacosides (26-DGA) A and B, respectively. O"-Rhamnosylisoswertisin (RIS) and unidentified flavonoid (UF) were also isolated as inhibitors. Inhibition tests to germ tube growth of Puccinia coronata avenae showed that 26-DGA A and B were potent inhibitors (ED80=14μg/ml), compared with RIS and UF (ED50=1, 500 and 500μg/ml, respectively). The contents of 26-DGA A and B in the water homogenate from 1g fresh leaves were 280 and 930μg, respectively, while only trace amounts of 26-DGAs were detected in the hot methanol extract of intact leaves. In contrast, the contents of RIS and UF were 750 and 300μg/ml, respectively, in both the water homogenate and hot methanol extract. No inhibitor other these four substances could be obtained. It was indicated that antifungal activity of the water homogenate is mainly attributable to 26-DGAs, whereas that in intact leaves is due to RIS and UF. No participation of these four inhitors as preformed substances was suggested in the species-species specificity in oat-rust combinations.

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