Accumulation of antifungal substances in branches of kiwifruit trees inoculated with Diaporthe sp.

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  • KINUGAWA M.
    Kagawa Prefecture Agricultural Experimental Station Plant Protection Office United Graduate School and Faculty of Agriculture, Kagawa University
  • KATO H.
    United Graduate School and Faculty of Agriculture, Kagawa University
  • AKIMITSU K.
    United Graduate School and Faculty of Agriculture, Kagawa University

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Other Title
  • 枝枯症菌Ｄｉａｐｏｒｔｈｅ　ｓｐ．接種キウイフルーツ枝における抗菌性物質の生成
  • エダガレショウキン Diaporthe sp セッシュ キウイフルーツ シ ニ オケル コウキンセイ ブッシツ ノ セイセイ

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Abstract

Six antifungal substances were extract from kiwifruit branches inoculated with Diaporthe sp., one was extracted from uninoculated branches, and one from wounded branches. Extracts from kiwifruit leaves also contained antifungal substances-five from leaves naturally infected with Botrytis cinerea and one from uninfected leaves. Antifungal activity of these substances was the highest 30 days after inoculation with Diaporthe sp.. Development of disease symptom also ended 30 days after the inoculation. Accumulation of antifungal substances was higher in one-year-old branches than in three- or six-year-old branches. These observations agreed with the development of disease symptoms in orchards, in which older branches of kiwifruit trees are more sensitive to Diaporthe sp. or Botrytis cinerea infection than younger ones.<br>

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