Year: 2023
Type: article
Abstract: 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.
Source: New Phytologist
DOI: 10.1111/nph.19004
Authors: Qin Yu, Chenxia Cheng, Xiaofeng Zhou, Yonghong Li, Yingchun Hu, Chun Yang, Yingying Zhou, Tarek M. A. Soliman, Hao Zhang, Qigang Wang, Huichun Wang, Cai‐Zhong Jiang, Su‐Sheng Gan, Junping Gao, Nan Ma
Institutions: China Agricultural University, Qingdao Agricultural University, Shenzhen Polytechnic University, Peking University, New Valley University, Yunnan Academy of Agricultural Sciences, Agricultural Research Service, United States Department of Agriculture, University of California, Davis, Cornell University, New York State College of Agriculture & Life Sciences
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $5,510
Awards: G3458998092, G3544112581, G6671666585
OpenAlex ID: W4379599360