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The OsMYC2-JA feedback loop regulates diurnal flower-opening time via cell wall loosening in rice

文献类型： 外文期刊

作者： Zhu, Xiaopei 1 ; Wang, Mumei 1 ; Huang, Zhen 1 ; Chen, Minghao 1 ; Xu, Peng 1 ; Liao, Shitang 1 ; Gao, Yannan 1 ; Zhao, Yongzhen 1 ; Chen, Huixuan 1 ; He, Jiahui 1 ; Luo, Yutong 1 ; Wei, Xiaoying 1 ; Zhu, Liya 3 ; Liu, Chuanhe 3 ; Huang, Jilei 3 ; Zhao, Xinhui 4 ; Zhao, Junliang 5 ; Zhang, Zemin 6 ; Zhuang, Chuxiong 1 ; Liu, Zhenlan 1 ; Zhou, Hai 1 ;

作者机构： 1.South China Agr Univ, Key Lab Enhancing Resource Use Efficiency Crops So, Minist Agr & Rural Affairs,State Key Lab Conservat, Coll Life Sci,Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

2.Shaoguan Univ, Guangdong Prov Key Lab Utilizat & Conservat Food &, Shaoguan 512005, Peoples R China

3.South China Agr Univ, Instrumental Anal & Res Ctr, Guangzhou 510642, Peoples R China

4.Yahua Seeds Sci Acad Hunan, Changsha 410119, Peoples R China

5.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Rice Engn Lab, Guangdong Key Lab New Technol Rice Breeding, Guangzhou 510640, Peoples R China

6.South China Agr Univ, Guangdong Prov Key Lab Plant Mol Breeding, State Key Lab Conservat & Utilizat Subtrop Agro Bi, Guangzhou 510642, Peoples R China

关键词： rice; hybrid breeding; diurnal flower-opening time; jasmonate; OsMYC2

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： Diurnal flower-opening time (DFOT), the time of spikelet opening during the day, is an important trait for hybrid rice (Oryza sativa L.) seed production. Hybrids between indica and japonica rice varieties have strong heterosis, but the parental lines usually have different, nonoverlapping DFOTs. This reduces the success of hybrid seed production in crosses between indica and japonica subspecies, thus hindering the utilization of indica and japonica inter-subspecies heterosis. However, little is known about the molecular mechanisms regulating DFOT in rice. Here, we obtained japonica rice lines with a DFOT 1.5 h earlier than the wild type by overexpressing OsMYC2, a gene encoding a key transcription factor in the jasmonate (JA) signaling pathway. OsMYC2 is activated by JA signaling and directly regulates the transcription of genes related to JA biosynthesis and cell wall metabolism. Overexpressing OsMYC2 led to significantly increased JA contents and decreased cellulose and hemicellulose contents in lodicule cells, as well as the softening of lodicule cell walls. This may facilitate the swelling of lodicules, resulting in early diurnal flower-opening. These results suggest that the OsMYC2-JA feedback loop regulates DFOT in rice via cell wall remodeling. These findings shed light on the understanding of regulatory mechanism of the DFOT of plants, which should promote the development of indica and japonica varieties suitable for hybrid rice breeding.

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