84.イチゴ葉の温湯処理による炭疽病菌抵抗性の誘導(口頭発表)

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Hot water (50-60℃) treatment is expected as a new technology to control diseases of greenhouse-grown strawberry. It has been suggested that hot water treatment should induce disease resistance of plants by heat shock reaction. In this paper, we studied the induction of resistance against anthracnose fungus (Colletotrichum gloeosporioides) by hot water treatment in strawberry leaves. Strawberry leaves were dipped in hot water (50℃) for 20s. After one-day incubation, C. gloeosporioides was inoculated. After 7 days, clear disease symptoms appeared in control leaves. However, almost no disease symptoms were observed in hot water-treated leaves. After hot water-treated leaves were injured, 25μL of distilled water was put on the wound. The water was collected after one-day incubation. The inhibitory activity of collected water from hot water-treated leaves against C. gloeosporioides spore germination was higher than that from control leaves.
2009-10-06