Natural variation in OsMYB8 confers diurnal floret opening time divergence between indica and japonica subspecies

Yajun Gou, Yueqin Heng, Wenyan Ding, Canhong Xu, Qiushuang Tan, Yajing Li, Yudong Fang, Xiaoqing Li, Degui Zhou, Xinyu Zhu, Mingyue Zhang, Rongjian Ye, Haiyang Wang () and Rongxin Shen ()
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Yajun Gou: South China Agricultural University
Yueqin Heng: South China Agricultural University
Wenyan Ding: South China Agricultural University
Canhong Xu: South China Agricultural University
Qiushuang Tan: South China Agricultural University
Yajing Li: South China Agricultural University
Yudong Fang: South China Agricultural University
Xiaoqing Li: South China Agricultural University
Degui Zhou: Guangdong Academy of Agricultural Sciences
Xinyu Zhu: South China Agricultural University
Mingyue Zhang: South China Agricultural University
Rongjian Ye: LTD
Haiyang Wang: South China Agricultural University
Rongxin Shen: South China Agricultural University

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract The inter-subspecific indica-japonica hybrid rice confer potential higher yield than the widely used indica-indica intra-subspecific hybrid rice. Nevertheless, the utilization of this strong heterosis is currently hindered by asynchronous diurnal floret opening time (DFOT) of indica and japonica parental lines. Here, we identify OsMYB8 as a key regulator of rice DFOT. OsMYB8 induces the transcription of JA-Ile synthetase OsJAR1, thereby regulating the expression of genes related to cell osmolality and cell wall remodeling in lodicules to promote floret opening. Natural variations of OsMYB8 promoter contribute to its differential expression, thus differential transcription of OsJAR1 and accumulation of JA-Ile in lodicules of indica and japonica subspecies. Furthermore, introgression of the indica haplotype of OsMYB8 into japonica effectively promotes DFOT in japonica. Our findings reveal an OsMYB8-OsJAR1 module that regulates differential DFOT in indica and japonica, and provide a strategy for breeding early DFOT japonica to facilitate breeding of indica-japonica hybrids.

Date: 2024
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DOI: 10.1038/s41467-024-46579-z

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