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Tal6b/avrxa27A,a hidden TALE targeting the susceptibility gene OsSWEET11a and the resistance gene Xa27 in rice

Plant Communications 2024年第2期5卷 122-134页

作者： Zhengyin Xu Xiameng Xu Ying Li Linlin Liu Qi Wang Yijie Wang Yong Wang Jiali Yan Guanyun Cheng Lifang Zou Bo Zhu Gongyou Chen Shanghai Collaborative Innovation Center of Agri-Seeds School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Microbial Metabolism Shanghai Jiao Tong UniversityShanghai 200240China

Xanthomonas oryzae ***(Xoo)secretes transcription activator-like effectors(TALEs)to activate rice susceptibility(S)genes,causing bacterial blight(BB),as well as resistance(R)genes,leading to de-fense against *** activation follows a gene-for-gene paradigm that results in an arms race between the TALE of the pathogen and effector-binding elements(EBEs)in the promoters of host *** this study,we characterized a novel TALE,designated Tal6b/avrxa27A,that activates the rice S gene OsSWEET11a and the rice R gene ***6b/avrxa27A is a member of the avrxa27/TalAO class and contains 16 repeat variable diresidues(RVDs);one RVD is altered and one is deleted in Tal6b/avrxa27A compared with avrxa27,a known avirulence(avr)effector of ***6b/avrxa27A can transcriptionally activate the expression of Xa27 and OsSWEET11a via EBEs in their corresponding promoters,leading to effector-triggered immunity and susceptibility,*** 16 RVDs in Tal6b/avrxa27A have no obvious similarity to the 24 RVDs in the effector PthXo1,but EBETal6b and EBEPthXo1 are overlapped in the OsSWEET11a ***6b/avrxa27A is prevalent among Asian Xoo isolates,but PthXo1 has only been reported in the Philippine strain *** editing of EBETal6b in the OsSWEET11a pro-moter further confirmed the requirement for OsSWEET11a expression in Tal6b/avrxa27A-dependent susceptibility to ***,Tal6b/avrxa27A resulted in higher transcription of Xa27 than of OsSWEET11a,which led to a strong,rapid resistance response that blocked disease *** suggest that Tal6b/avrxa27A has a dual function:triggering resistance by activating Xa27 gene expression as an avirulence factor and inducing transcription of the S gene OsSWEET11a,resulting in ***,Tal6b/avrxa27A,but not avrxa27,can bind to the promoter of *** underlying recognition mechanism for this binding remains unclear but appears to deviate from the currently accepted TALE code.

关键词： Xanthomonas oryzae pv.oryzae TALE avrxa27 tal6b Xa27 OsSWEET11a

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