Induction of Resistance in Rice Against Magnaporthe Oryzae by Culture Filtrates of Biscogniauxia sp. O821

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• 作者：Quyet Thi Nguyen ; Kana Ueda ; Junichi Kihara and Makoto Ueno
• 刊名：Journal of Phytopathology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：164
• 期：11pt12
• 页码：990-995
• 全文大小：402K
• ISSN：1439-0434

文摘

The fungal strain O821 of Biscogniauxia sp. was isolated from wild mushrooms collected in Japan. Here, we demonstrate that a 24-h pretreatment of rice leaves with an ethyl acetate extract of a culture filtrate from strain O821 (O821-ECF) reduced the severity of rice blast disease caused by infection with Magnaporthe oryzae. To investigate possible mechanisms of this effect, we examined defence responses in the leaves. O821-ECF treatment elicited the production of hydrogen peroxide (H₂O₂) and increased transcription of the PBZ1 gene. A time course analysis of H₂O₂ production indicated an increase with time after O821-ECF treatment. Expression of the PBZ1 gene similarly peaked at 24 h after O821-ECF treatment. However, no accumulation of salicylic acid (SA) was observed at 24 h after O821-ECF treatment. These results suggest that SA-independent resistance to rice blast is induced by O821-ECF. Studies of O821-ECF may contribute to the development of new plant activators for plant diseases such as rice blast disease.