The MADS6, JAGGED, and YABBY proteins synergistically determine floral organ development in rice

文献类型： 外文期刊

第一作者： Cai, Zhengzheng

作者： Cai, Zhengzheng;Li, Jieqiong;Su, Yuanyuan;Zheng, Lili;Zhang, Jianwei;Zhu, Miaomiao;Kong, Lan;Ye, Yanfang;Wu, Weiren;Duan, Yuanlin;Cai, Zhengzheng;Li, Jieqiong;Su, Yuanyuan;Zheng, Lili;Zhang, Jianwei;Zhu, Miaomiao;Kong, Lan;Ye, Yanfang;Wu, Weiren;Duan, Yuanlin;Qiu, Bingwen;Kong, Lan;Xue, Yongbiao;Xue, Yongbiao

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：6.9； 五年影响因子：7.7 ）

ISSN： 0032-0889

年卷期： 2025 年 197 卷 3 期

页码：

收录情况： SCI

摘要： MADS6, JAGGED (JAG), and DROOPING LEAF (DL) are key regulators of floral organ patterns in rice (Oryza sativa); however, how they work together in specifying floral organs remains to be determined. Here, we extensively analyzed the coordination mechanism. Genetic interactions showed that all double/triple mutant combinations of mads6-5 with jag and/or dl-sup7 generated an inflorescence from the spikelet center and lemma-like organs (LLOs) at the periphery, indicating that these genes synergistically promote floral organ specification, inhibit inflorescence initiation, and terminate the floral meristem (FM). Particularly, a fully developed mads6-5 jag spikelet appeared as a large bouquet composed of numerous multifloral complexes (MFC), while the triple mutant was generally similar to mads6-5 jag, except for a longer pedicel and fewer MFCs. Expression analysis revealed that JAG directly inhibits the transcription of MADS6 in stamens but not in pistils, as JAG and DL co-express in pistils and form a JAG-DL complex, indicating that JAG and DL may coordinate the transcription of MADS6 in sexual organs. Protein interactions revealed that MADS6 and JAG bind to 5 spikelet-related YABBY proteins (including DL), forming 10 heterodimers, suggesting that they may promote floral differentiation through various pathways. However, MADS6 and JAG neither bound together nor formed a heterotrimer with any of the 5 YABBY proteins. These findings revealed specific synergistic patterns between MADS6, JAGGED, and YABBY proteins, which may contribute to the unique characteristics of rice spikelets and provide insights into the diversity regulation mechanisms of floral specification in plants. The transcription factors MADS6 and JAGGED synergistically determine rice spikelet characteristics by regulating MADS6 transcription and genetic and physical interaction with YABBY family proteins.

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