Enhanced resistance of rice to the rice blast fungus Magnaporthe oryzae when treated with autoclaved water extracts from fruiting bodies of several mushrooms

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  • きのこ子実体の熱水抽出液処理によるイネいもち病菌 に対するイネへの抵抗性誘導
  • キノコシジツタイ ノ ネッスイ チュウシュツエキ ショリ ニ ヨル イネイモチ ビョウキン ニ タイスル イネ エ ノ テイコウセイ ユウドウ

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We report that autoclaved water extracts from the fruiting bodies of several mushrooms (<i>Lyophyllum decastes</i>, Lentinula edodes, Pleurotus eryngii and Grifola frondosa) can protect rice from blast disease caused by Magnaporthe oryzae. When rice plants pretreated for one week with these extracts were inoculated with M. oryzae, the number of blast lesions on leaves was significantly decreased compared to those treated with distilled water as a control. None of the extracts inhibited the germination of M. oryzae spores. Furthermore, H2O2 generation and PR10a gene expression, which are involved in systemic acquired esistance, significantly increased in the leaves pretreated with the extracts for 24 h. These results suggested that the protective effect of extracts from fruiting bodies of mushrooms was due to enhancing resistance, and that extracts may be a useful tool for protecting rice from blast disease caused by M. oryzae.

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