The 'Candidatus phytoplasma ziziphi' effectors SJP1 and SJP2 destabilise the bifunctional regulator ZjTCP7 to modulate floral transition and shoot branching
文献类型： 外文期刊
第一作者： Ma, Fuli
作者： Ma, Fuli;Huang, Xiang;Zhou, Junyong;Zhang, Ning;Deng, Mingsheng;Zheng, Yunyan;Zhao, Meiqi;Chen, Wei;Zhou, Wenmin;Zhai, Liping;Zhong, Lei;Pang, Kaixue;Liu, Xin;Zhong, Xinyue;Ren, Yifan;Liu, Yu;Sun, Jun;Zhou, Junyong;Sun, Qibao
作者机构：
关键词： flowering time; jujube witches' broom; SAP11 effector; shoot branching; Ziziphus jujuba
期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.3； 五年影响因子：8.1 ）
ISSN： 0140-7791
年卷期： 2024 年
页码：
收录情况： SCI
摘要： Phytoplasmic SAP11 effectors alter host plant architecture and flowering time. However, the exact mechanisms have yet to be elucidated. Two SAP11-like effectors, SJP1 and SJP2, from 'Candidatus Phytoplasma ziziphi' induce shoot branching proliferation. Here, the transcription factor ZjTCP7 was identified as a central target of these two effectors to regulate floral transition and shoot branching. Ectopic expression of ZjTCP7 resulted in enhanced bolting and earlier flowering than did the control. Interaction and expression assays demonstrated that ZjTCP7 interacted with the ZjFT-ZjFD module, thereby enhancing the ability of these genes to directly bind to the ZjAP1 promoter. The effectors SJP1 and SJP2 unravelled the florigen activation complex by specifically destabilising ZjTCP7 and ZjFD to delay floral initiation. Moreover, the shoot branching of the ZjTCP7-SRDX transgenic Arabidopsis lines were comparable to those of the SJP1/2 lines, suggesting the involvement of ZjTCP7 in the regulation of shoot branching. ZjTCP7 interacted with the branching repressor ZjBRC1 to enhance suppression of the auxin efflux carrier ZjPIN3 expression. ZjTCP7 also directly bound to and upregulated the auxin biosynthesis gene ZjYUCCA2, thereby promoting auxin accumulation. Our findings confirm that ZjTCP7 serves as a bifunctional regulator destabilised by the effectors SJP1 and SJP2 to modulate plant development.
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