Accumulation of antifungal substances in branches of kiwifruit [Actinidia deliciosa] trees inoculated with Diaporthe sp.
2008
Kinugawa, M.(Kagawa-ken. Agricultural Experiment Station, Takamatsu (Japan)) | Kato, H. | Akimitsu, K.
Six antifungal substances were extracted 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.
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