ZmELF3.1 integrates the RA2-TSH4 module to repress maize tassel branching
文献类型: 外文期刊
第一作者: Xie, Yurong
作者: Xie, Yurong;Zhao, Yongping;Li, Changyu;Zhou, Linyu;Li, Huiru;Zhao, Yanfeng;Wang, Baobao;Xu, Miaoyun;Zhao, Binbin;Xie, Yurong;Wang, Baobao;Xu, Miaoyun;Chen, Lihong;Xue, Weicong;Kong, Dexin;Wang, Haiyang;Bilska-Kos, Anna
作者机构:
关键词: maize; RA2; tassel branch number (TBN); TSH4; ZmELF3.1
期刊名称:NEW PHYTOLOGIST ( 影响因子:9.4; 五年影响因子:10.5 )
ISSN: 0028-646X
年卷期: 2023 年
页码:
收录情况: SCI
摘要: Tassel branch number (TBN) is a key agronomic trait for adapting to high-density planting and grain yield in maize. However, the molecular regulatory mechanisms underlying tassel branching are still largely unknown.Here, we used molecular and genetic studies together to show that ZmELF3.1 plays a critical role in regulating TBN in maize.Previous studies showed that ZmELF3.1 forms the evening complex through interacting with ZmELF4 and ZmLUX to regulate flowering in maize and that RA2 and TSH4 (ZmSBP2) suppresses and promotes TBN in maize, respectively. In this study, we show that loss-of-function mutants of ZmELF3.1 exhibit a significant increase of TBN. We also show that RA2 directly binds to the promoter of TSH4 and represses its expression, thus leading to reduced TBN. We further demonstrate that ZmELF3.1 directly interacts with both RA2 and ZmELF4.2 to form tri-protein complexes that further enhance the binding of RA2 to the promoter of TSH4, leading to suppressed TSH4 expression and consequently decreased TBN.Our combined results establish a novel functional link between the ELF3-ELF4-RA2 complex and miR156-SPL regulatory module in regulating tassel branching and provide a valuable target for genetic improvement of tassel branching in maize.
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