ZmSPL10, ZmSPL14 and ZmSPL26 act together to promote stigmatic papilla formation in maize through regulating auxin signaling and ZmWOX3A expression

文献类型： 外文期刊

第一作者： Kong, Dexin

作者： Kong, Dexin;Jing, Yifeng;Duan, Yaping;He, Mengqi;Ding, Hui;Zhong, Zhuojun;Zheng, Zhigang;Fan, Xiuying;Pan, Xuan;Li, Yanqun;Bai, Mei;Li, Xinjian;Luo, Minhua;Xue, Weicong;Zhang, Xiaoming;Xu, Xin;Yuan, Yateng;Zou, Ting;Chen, Lihong;Ding, Wenyan;Wu, Hong;Liu, Qing;Wang, Haiyang;Li, Heying;Zhao, Yongping;Wang, Baobao

作者机构：

关键词： auxin; Maize (Zea mays L.); stigmatic papilla; ZmSPL10; ZmSPL14; ZmSPL26; ZmWOX3A

期刊名称：NEW PHYTOLOGIST （ 影响因子：8.3； 五年影响因子：10.2 ）

ISSN： 0028-646X

年卷期： 2024 年 243 卷 5 期

页码：

收录情况： SCI

摘要： center dot Maize silk is a specialized type of stigma, covered with numerous papillae for pollen grain capture. However, the developmental process of stigmatic papillae and the underlying regulatory mechanisms have remained largely unknown. center dot Here, we combined the cytological, genetic and molecular studies to demonstrate that three homologous genes ZmSPL10, ZmSPL14 and ZmSPL26 play a central role in promoting stigmatic papilla formation in maize. center dot We show that their triple knockout mutants are nearly complete lack of stigmatic papilla, resulting in a severe reduction in kernel setting. Cellular examination reveals that stigmatic papilla is developed from a precursor cell, which is the smaller daughter cell resulting from asymmetric cell division of a silk epidermal cell. In situ hybridization shows that ZmSPL10, ZmSPL14 and their target genes SPI1, ZmPIN1b, ZmARF28 and ZmWOX3A are preferentially expressed in the precursor cells of stigmatic papillae. Moreover, ZmSPL10, ZmSPL14 and ZmSPL26 directly bind to the promoters of SPI1, ZmPIN1b, ZmARF28 and ZmWOX3A and promote their expression. Further, Zmwox3a knockout mutants display severe defects in stigmatic papilla formation and reduced seed setting. center dot Collectively, our results demonstrate that ZmSPL10, ZmSPL14 and ZmSPL26 act together to promote stigmatic papilla development through regulating auxin signaling and ZmWOX3A expression.

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