文献类型： 外文期刊
作者： Khan, Muhammad Saad Shoaib 1 ; Islam, Faisal 2 ; Chen, Huan 4 ; Chang, Ming 6 ; Wang, Daowen 7 ; Liu, Fengquan 4 ; Fu, Zheng Qing 5 ; Chen, Jian 1 ;
作者机构： 1.Jiangsu Univ, Int Genome Ctr, Zhenjiang, Jiangsu, Peoples R China
2.Zhejiang Univ, Inst Crop Sci, Hangzhou, Peoples R China
3.Zhejiang Univ, Zhejiang Key Lab Crop Germplasm, Hangzhou, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China
5.Univ South Carolina, Dept Biol Sci, Columbia, SC 29208 USA
6.Nanjing Agr Univ, Coll Life Sci, Key Lab Biointeract & Plant Hlth, Nanjing, Peoples R China
7.Henan Agr Univ, State Key Lab Wheat & Maize Crop Sci, Zhengzhou, Peoples R China
8.Henan Agr Univ, Coll Agron, Zhengzhou, Peoples R China
关键词： salicylic acid; NPR1; EDS1; mediator; CDK8; transcriptional coactivators; plant immunity
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）
ISSN： 1664-462X
年卷期： 2022 年 13 卷
页码：
收录情况： SCI
摘要： Salicylic acid (SA) is a plant defense signal that mediates local and systemic immune responses against pathogen invasion. However, the underlying mechanism of SA-mediated defense is very complex due to the involvement of various positive and negative regulators to fine-tune its signaling in diverse pathosystems. Upon pathogen infections, elevated level of SA promotes massive transcriptional reprogramming in which Non-expresser of PR genes 1 (NPR1) acts as a central hub and transcriptional coactivator in defense responses. Recent findings show that Enhanced Disease Susceptibility 1 (EDS1) also functions as a transcriptional coactivator and stimulates the expression of PR1 in the presence of NPR1 and SA. Furthermore, EDS1 stabilizes NPR1 protein level, while NPR1 sustains EDS1 expression during pathogenic infection. The interaction of NPR1 and EDS1 coactivators initiates transcriptional reprogramming by recruiting cyclin-dependent kinase 8 in the Mediator complex to control immune responses. In this review, we highlight the recent breakthroughs that considerably advance our understanding on how transcriptional coactivators interact with their functional partners to trigger distinct pathways to facilitate immune responses, and how SA accumulation induces dynamic changes in NPR1 structure for transcriptional reprogramming. In addition, the functions of different Mediator subunits in SA-mediated plant immunity are also discussed in light of recent discoveries. Taken together, the available evidence suggests that transcriptional coactivators are essential and potent regulators of plant defense pathways and play crucial roles in coordinating plant immune responses during plant-pathogen interactions.
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