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Rice transcription factor OsNAC2 maintains the homeostasis of immune responses to bacterial blight

文献类型： 外文期刊

作者： Zhong, Qun 1 ; Yu, Jiangtao 3 ; Wu, Yiding 1 ; Yao, Xuefeng 4 ; Mao, Chanjuan 1 ; Meng, Xiangzong 1 ; Ming, Feng 1 ;

作者机构： 1.Shanghai Normal Univ, Coll Life Sci, Shanghai Key Lab Plant Mol Sci, Shanghai 200234, Peoples R China

2.Shanghai Acad Agr Sci, Biotechnol Res Inst, Shanghai 201106, Peoples R China

3.Northwest Agr & Forestry Univ, Inst Future Agr, Xianyang 712100, Shaanxi, Peoples R China

4.Chinese Acad Sci, Key Lab Plant Mol Physiol, Inst Bot, Beijing 100093, Peoples R China

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Rice (Oryza sativa) bacterial blight, caused by Xanthomonas oryzae pv. Oryzae (Xoo), threatens plant growth and yield. However, the molecular mechanisms underlying rice immunity against Xoo remain elusive. Here, we identified a NAC (NAM-ATAF-CUC) transcription factor OsNAC2 as a negative regulator in the resistance to bacterial blight disease in rice. Constitutive overexpression of OsNAC2 inhibited the expression of salicylic acid (SA) biosynthesis-related genes (i.e. isochorismate synthase 1 (OsICS1), phenylalanine ammonia lyase 3 (OsPAL3), etc.) with adverse impacts on the pathogenesis-related proteins (PRs) responses and compromised blight resistance. Moreover, OsNAC2 interacted with APETALA2/ethylene-responsive element binding protein (AP2/EREBP) transcription factor OsEREBP1 and possibly threatened its protein stability, destroying the favorable interaction of OsEREBP1-Xa21-binding protein OsXb22a in the cytoplasm during Xoo-induced infection. On the contrary, downregulation of OsNAC2 resulted in enhanced resistance to bacterial blight in rice without any growth or yield penalties. Our results demonstrated that OsNAC2 inhibits SA signaling and stably interacted with OsEREBP1 to impair disease resistance. This OsNAC2-OsEREBP1-based homeostatic mechanism provided insights into the competition between rice and bacterial pathogens, and it will be useful to improve the disease resistance of important crops through breeding. A NAC transcription factor inhibits salicylic acid signaling and interacts with a positive regulator of resistance, leading to compromised bacterial blight resistance in rice.

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