GS9 acts as a transcriptional activator to regulate rice grain shape and appearance quality

Dong-Sheng Zhao, Qian-Feng Li, Chang-Quan Zhang, Chen Zhang, Qing-Qing Yang, Li-Xu Pan, Xin-Yu Ren, Jun Lu, Ming-Hong Gu and Qiao-Quan Liu ()
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Dong-Sheng Zhao: Yangzhou University
Qian-Feng Li: Yangzhou University
Chang-Quan Zhang: Yangzhou University
Chen Zhang: Yangzhou University
Qing-Qing Yang: Yangzhou University
Li-Xu Pan: Yangzhou University
Xin-Yu Ren: Yangzhou University
Jun Lu: Yangzhou University
Ming-Hong Gu: Yangzhou University
Qiao-Quan Liu: Yangzhou University

Nature Communications, 2018, vol. 9, issue 1, 1-14

Abstract: Abstract Identification of grain shape determining genes can facilitate breeding of rice cultivars with optimal grain shape and appearance quality. Here, we identify GS9 (Grain Shape Gene on Chromosome 9) gene by map-based cloning. The gs9 null mutant has slender grains, while overexpression GS9 results in round grains. GS9 encodes a protein without known conserved functional domain. It regulates grain shape by altering cell division. The interaction of GS9 and ovate family proteins OsOFP14 and OsOFP8 is modulated by OsGSK2 kinase, a key regulator of the brassinosteroids signaling pathway. Genetic interaction analysis reveals that GS9 functions independently from other previously identified grain size genes. Introducing the gs9 allele into elite rice cultivars significantly improves grain shape and appearance quality. It suggests potential application of gs9, alone or in combination with other grain size determining genes, in breeding of rice varieties with optimized grain shape.

Date: 2018
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DOI: 10.1038/s41467-018-03616-y

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