Ethylene restrains brassinosteroid‐driven petal growth through <scp>RhMPK7</scp> ‐mediated phosphorylation of <scp>RhBZR1</scp> in rose
variant display significantly enlarged petals. We further show that ethylene simultaneously activates RhMPK7 and stabilizes the RhMPK7-RhBZR1 interaction. Genetic analyses confirm that RhMPK7 restricts petal expansion specifically by antagonizing RhBZR1, and this module is essential for ethylene-mediated growth suppression. These results indicate a phosphorylation-based 'speed governor' that dynamically restrains hormone-induced rapid cell expansion, offering a new paradigm for the posttranslational gating of organ size.
Authors
- Yuexuan Qiu (ORCID: https://orcid.org/0009-0006-0251-7160)
- Yunhe Jiang (ORCID: https://orcid.org/0000-0002-7599-1422)
- Junping Gao (ORCID: https://orcid.org/0000-0002-9285-2539)
- Cai‐Zhong Jiang (ORCID: https://orcid.org/0000-0002-5972-7963)
- R T. Wang
- Changxi Chen (ORCID: https://orcid.org/0000-0003-2833-3264)
- Y Liu
- Xiaoming Sun (ORCID: https://orcid.org/0000-0002-0788-3382)
- Yi Guo (ORCID: https://orcid.org/0000-0001-7217-0322)
- Feifei Gong (ORCID: https://orcid.org/0009-0003-4210-5820)
- Ping Li
- Jingyi Wen
- Mingcan An
- Wenfang Deng
- Yueming Qin
- Xue Han
Institutions
- China Agricultural University (CN)
- University of California, Davis (US)
Publication Details
- Journal
- New Phytologist
- Published
- 2026-05-12
- DOI
- https://doi.org/10.1111/nph.71247
- Primary Topic
- Plant Molecular Biology Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00