What question did this study set out to answer?

The study aims to understand how ethylene affects petal growth regulated by brassinosteroids in roses.

May 15, 2026New Phytologist1 citations

Ethylene restrains brassinosteroid‐driven petal growth through RhMPK7 ‐mediated phosphorylation of RhBZR1 in rose

RWR T. WangUniversity of Georgia YGYi GuoHebei University of Chinese Medicine YQYuexuan QiuChina Agricultural University

Key Points

The study aims to understand how ethylene affects petal growth regulated by brassinosteroids in roses.
Genetic analyses were performed to investigate the interaction between RhMPK7 and RhBZR1.
Phosphorylation patterns were evaluated in relation to ethylene signaling and petal expansion.
Petal growth measurements were taken to assess the impact of ethylene signaling on expansion.
Ethylene activates RhMPK7 and stabilizes its interaction with RhBZR1.
RhMPK7 antagonizes RhBZR1, leading to restricted petal growth.
The module involving these proteins acts as a 'speed governor' for hormone-induced cell expansion.

Abstract

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.

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