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안종욱,Nguyen Xuan Canh,김선호,Bahk Sunghwa,강호빈,Le Anh Pham Minh,박재민,RAMADANYZAKIYAH,김상희,Park Hyeong Cheol,정우식 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.6
Flavonoids have a variety of biological functions including UV protectant, antioxidant, allelopathy and auxin transport inhibitor in plants. In addition, favonoids are implicated in defense response against pathogens. In this study, we found that kaempferol, a kind of favonol, induces bacterial pathogen resistance. In addition, we identifed the signaling pathway to explain how kaempferol can induce pathogen resistance in Arabidopsis. We showed that kaempferol upregulates the transcription of two pathogenesis-related (PR) genes. Interestingly, the monomerization and nuclear translocation of NPR1, a key regulator of PR gene expression, was induced by kaempferol through the accumulation of salicylic acid (SA). Furthermore, we found that the kaempferol-induced monomerization of NPR1 is mediated by the activation of MPK3 and MPK6. Taken together, this study suggests that kaempferol induces pathogen resistance by both SA and MPK-dependent signaling pathways in Arabidopsis.