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GS9 acts as a transcriptional activator to regulate rice grain shape and appearance quality
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Journal Article
GS9 acts as a transcriptional activator to regulate rice grain shape and appearance quality
2018
Overview
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.
Rice grain shape or size is an important trait associated with both yield and appearance quality. Here, the authors identify GS9 as a negative transcription regulator of slender grain and show it can improve grain shape and appearance independently from other previously identified grain size genes.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
