文献类型： 外文期刊
第一作者： Yu, Qin
作者： Yu, Qin;Cheng, Chenxia;Zhou, Xiaofeng;Yang, Chun;Zhou, Yingying;Gao, Junping;Ma, Nan;Cheng, Chenxia;Li, Yonghong;Hu, Yingchun;Soliman, Tarek M. A.;Zhang, Hao;Wang, Qigang;Wang, Huichun;Jiang, Cai-Zhong;Jiang, Cai-Zhong;Gan, Su-Sheng
作者机构：
关键词： auxin; cambium; ethylene; HD-ZIP I transcription factor; Rosa hybrida
期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）
ISSN： 0028-646X
年卷期： 2023 年 239 卷 3 期
页码：
收录情况： SCI
摘要： The vascular cambium is the main secondary meristem in plants that produces secondary phloem (outside) and xylem (inside) on opposing sides of the cambium. The phytohormone ethylene has been implicated in vascular cambium activity, but the regulatory network underlying ethylene-mediated cambial activity remains to be elucidated.Here, we found that PETAL MOVEMENT-RELATED PROTEIN1 (RhPMP1), an ethylene-inducible HOMEODOMAIN-LEUCINE ZIPPER I transcription factor in woody plant rose (Rosa hybrida), regulates local auxin biosynthesis and auxin transport to maintain cambial activity.Knockdown of RhPMP1 resulted in smaller midveins and reduced auxin content, while RhPMP1 overexpression resulted in larger midveins and increased auxin levels compared with the wild-type plants. Furthermore, we revealed that Indole-3-pyruvate monooxygenase YUCCA 10 (RhYUC10) and Auxin transporter-like protein 2 (RhAUX2), encoding an auxin biosynthetic enzyme and an auxin influx carrier, respectively, are direct downstream targets of RhPMP1.In summary, our results suggest that ethylene promotes an auxin maximum in the cambium adjacent to the xylem to maintain cambial activity.
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