Natural variation in the promoter of TGW2 determines grain width and weight in rice

• 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, en...

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Bibliographic Details
Published in:The New phytologist 2020-07, Vol.227 (2), p.629-640
Main 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
Format: Article
Language:English
Subjects:
Cell cycle
Cell number
cell number regulator
Cell proliferation
Chromosome Mapping
Crop yield
Cultivars
DNA sequences
Edible Grain - genetics
Gene mapping
Genes, Plant
Genetic analysis
Genetic diversity
Genetic variation
Glumes
Grain size
grain width and weight
Morphology
Nucleotides
Oryza - genetics
Plant Breeding
Plant Proteins
Polymorphism
Proliferation
Quantitative trait loci
Quantitative Trait Loci - genetics
quantitative trait locus (QTL)
Rice
Single-nucleotide polymorphism
TGW2
Weight
Width
yield
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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.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.16540