The grain yield modulator miR156 regulates seed dormancy through the gibberellin pathway in rice

Chunbo Miao, Zhen Wang, Lin Zhang, Juanjuan Yao, Kai Hua, Xue Liu, Huazhong Shi and Jian-Kang Zhu ()
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Chunbo Miao: Chinese Academy of Sciences
Zhen Wang: Chinese Academy of Sciences
Lin Zhang: Yangzhou University
Juanjuan Yao: Chinese Academy of Sciences
Kai Hua: Chinese Academy of Sciences
Xue Liu: Chinese Academy of Sciences
Huazhong Shi: Texas Tech University
Jian-Kang Zhu: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract The widespread agricultural problem of pre-harvest sprouting (PHS) could potentially be overcome by improving seed dormancy. Here, we report that miR156, an important grain yield regulator, also controls seed dormancy in rice. We found that mutations in one MIR156 subfamily enhance seed dormancy and suppress PHS with negligible effects on shoot architecture and grain size, whereas mutations in another MIR156 subfamily modify shoot architecture and increase grain size but have minimal effects on seed dormancy. Mechanistically, mir156 mutations enhance seed dormancy by suppressing the gibberellin (GA) pathway through de-represssion of the miR156 target gene Ideal Plant Architecture 1 (IPA1), which directly regulates multiple genes in the GA pathway. These results provide an effective method to suppress PHS without compromising productivity, and will facilitate breeding elite crop varieties with ideal plant architectures.

Date: 2019
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DOI: 10.1038/s41467-019-11830-5

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