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ZmEREB92 plays a negative role in seed germination by regulating ethylene signaling and starch mobilization in maize

文献类型： 外文期刊

作者： Fu, Jingye 1 ; Pei, Wenzheng 1 ; He, Linqian 1 ; Ma, Ben 1 ; Tang, Chen 1 ; Zhu, Li 1 ; Wang, Liping 1 ; Zhong, Yuanyuan 1 ; Chen, Gang 2 ; Wang, Qi 3 ; Wang, Qiang 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Agron, State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu, Peoples R China

2.Chiba Univ, Grad Sch Hort, Matsudo, Chiba, Japan

3.Chinese Acad Fishery Sci, Key Lab Aquat Genom, Beijing Key Lab Fishery Biotechnol, Minist Agr & Rural Affairs, Beijing, Peoples R China

期刊名称：PLOS GENETICS （ 影响因子：4.5； 五年影响因子：5.5 ）

ISSN： 1553-7404

年卷期： 2023 年 19 卷 11 期

页码：

收录情况： SCI

摘要： Rapid and uniform seed germination is required for modern cropping system. Thus, it is important to optimize germination performance through breeding strategies in maize, in which identification for key regulators is needed. Here, we characterized an AP2/ERF transcription factor, ZmEREB92, as a negative regulator of seed germination in maize. Enhanced germination in ereb92 mutants is contributed by elevated ethylene signaling and starch degradation. Consistently, an ethylene signaling gene ZmEIL7 and an alpha-amylase gene ZmAMYa2 are identified as direct targets repressed by ZmEREB92. OsERF74, the rice ortholog of ZmEREB92, shows conserved function in negatively regulating seed germination in rice. Importantly, this orthologous gene pair is likely experienced convergently selection during maize and rice domestication. Besides, mutation of ZmEREB92 and OsERF74 both lead to enhanced germination under cold condition, suggesting their regulation on seed germination might be coupled with temperature sensitivity. Collectively, our findings uncovered the ZmEREB92-mediated regulatory mechanism of seed germination in maize and provide breeding targets for maize and rice to optimize seed germination performance towards changing climates. Seed germination is a crucial step for agricultural production, yet the regulatory mechanism in many crops remains unclear. We demonstrated that ZmEREB92 negatively regulates maize seed germination in a temperature-sensitive manner. In suitable condition, ZmEREB92 is transcriptionally inhibited during imbibition, thereby releasing the expression of ZmEIL7 and ZmAMYa2 to enhance ethylene signaling and starch degradation, which ensures timely germination. When the temperature is low, the expression of ZmEREB92 is strongly induced after imbibition. The increased level of ZmEREB92 directly represses the transcription of ZmEIL7 and ZmAMYa2 by binding to their promoters, leading to inhibited seed germination. The rice ortholog of ZmEREB92, OsERF74, is functionally conserved in controlling seed germination in rice, and this orthologous gene pair show evidences of selection during maize and rice domestication.

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