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- Title
Natural variation in the promoter of TGW2 determines grain width and weight in rice.
- Authors
Ruan, Banpu; Shang, Lianguang; Zhang, Bin; Hu, Jiang; Wang, Yuexing; Lin, Hai; Zhang, Anpeng; Liu, Chaolei; Peng, Youlin; Zhu, Li; Ren, Deyong; Shen, Lan; Dong, Guojun; Zhang, Guangheng; Zeng, Dali; Guo, Longbiao; Qian, Qian; Gao, Zhenyu
- Abstract
Summary: Understanding the genetic basis of natural variation in grain size among diverse rice varieties can help breeders develop high‐yielding rice cultivars.Here, we report the discovery of qTGW2, a new semidominant quantitative trait locus for grain width and weight. The corresponding gene, TGW2, encodes CELL NUMBER REGULATOR 1 (OsCNR1) localized to the plasma membrane.A single nucleotide polymorphism (SNP) variation 1818 bp upstream of TGW2 is responsible for its different expression, leading to alteration in grain width and weight by influencing cell proliferation and expansion in glumes. TGW2 interacts with KRP1, a regulator of cell cycle in plants, to negatively regulate grain width and weight. Genetic diversity analysis of TGW2 in 141 rice accessions revealed it as a breeding target in a selective sweep region.Our findings provide new insights into the genetic mechanism underlying grain morphology and grain weight, and uncover a promising gene for improving rice yield.
- Subjects
GRAIN size; PLANT cell cycle; GRAIN; RICE; SINGLE nucleotide polymorphisms; BREEDING
- Publication
New Phytologist, 2020, Vol 227, Issue 2, p629
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.16540