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AH2 encodes a MYB domain protein that determines hull fate and affects grain yield and quality in rice. 2019
Deyong Ren, and
Yuanjiang Cui, and
Haitao Hu, and
Qiankun Xu, and
Yuchun Rao, and
Xiaoqi Yu, and
Yu Zhang, and
Yuexing Wang, and
Youlin Peng, and
Dali Zeng, and
Jiang Hu, and
Guangheng Zhang, and
Zhenyu Gao, and
Li Zhu, and
Guang Chen, and
Lan Shen, and
Qiang Zhang, and
Longbiao Guo, and
Qian Qian
State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, People's Republic of China.
The palea and lemma (hull) are grass-specific organs, and determine grain size and quality. In the study, AH2 encodes a MYB domain protein, and functions in the development of hull and grain. Mutation of AH2 produces smaller grains and alters grain quality including decreased amylose content and gel consistency, and increased protein content. Meantime, part of the hull lost the outer silicified cells, and induces a transformation of the outer rough epidermis to inner smooth epidermis cells, and the body of the palea was reduced in the ah2 mutant. We confirmed the function of AH2 by complementation, CRISPR-Cas9, and cytological and molecular tests. Additionally, AH2, as a repressor, repress transcription of the downstream genes. Our results revealed that AH2 plays an important role in the determination of hull epidermis development, palea identity, and grain size.
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