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RhMYC2 controls petal size through synergistic regulation of jasmonic acid and cytokinin signaling in rose

文献类型： 外文期刊

作者： Gong, Feifei 1 ; Jing, Weikun 1 ; Jin, Weichan 1 ; Liu, Huwei 1 ; Zhang, Yuanfei 1 ; Wang, Rui 1 ; Wei, Yinghao 1 ; Tang, Kaiyang 1 ; Jiang, Yunhe 1 ; Gao, Junping 1 ; Sun, Xiaoming 1 ;

作者机构： 1.China Agr Univ, Coll Hort, Dept Ornamental Hort, Beijing Key Lab Dev & Qual Control Ornamental Crop, Beijing 100193, Peoples R China

2.Yunnan Acad Agr Sci, Flower Res Inst, Kunming 650205, Yunnan, Peoples R China

关键词： jasmonic acid; cytokinin; RhMYC2; RhLOG3; cell division; petal growth

期刊名称：PLANT JOURNAL （ 影响因子：6.2； 五年影响因子：7.1 ）

ISSN： 0960-7412

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Petal size is determined by cell division and cell expansion. Jasmonic acid (JA) has been reported to be associated with floral development, but its regulatory mechanism affecting petal size remains unclear. Here, we reveal the vital role of JA in regulating petal size and the duration of the cell division phase via the key JA signaling component RhMYC2. We show that RhMYC2 expression is induced by exogenous treatment with methyl jasmonate and decreases from stage 0 to stage 2 of flower organ development, corresponding to the cell division phase. Furthermore, silencing RhMYC2 shortened the duration of the cell division phase, ultimately accelerating flowering opening and resulting in smaller petals. In addition, we determined that RhMYC2 controls cytokinin homeostasis in rose petals by directly activating the expression of the cytokinin biosynthetic gene LONELY GUY3 (RhLOG3) and repressing that of the cytokinin catabolism gene CYTOKININ OXIDASE/DEHYDROGENASE6 (RhCKX6). Silencing RhLOG3 shortened the duration of the cell division period and produced smaller petals, similar to RhMYC2 silencing. Our results underscore the synergistic effects of JA and cytokinin in regulating floral development, especially for petal size in roses.

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