Characterization of a Major Quantitative Trait Locus for the Whiteness of Rice Grain Using Chromosome Segment Substitution Lines
文献类型： 外文期刊
作者： Chen, Lulu 1 ; Leng, Yujia 1 ; Zhang, Caiyun 1 ; Li, Xixu 1 ; Ye, Zhihui 1 ; Lu, Yan 1 ; Huang, Lichun 2 ; Liu, Qing 2 ; Gao, Jiping 2 ; Zhang, Changquan 1 ; Liu, Qiaoquan 2 ;
作者机构： 1.Yangzhou Univ, Jiangsu Coinnovat Ctr Modern Prod Technol Grain Cr, Jiangsu Key Lab Crop Genom & Mol Breeding, Agr Coll, Yangzhou 225009, Peoples R China
2.Yangzhou Univ, Key Lab Plant Funct Genom, Zhongshan Biol Breeding Lab, Minist Educ, Yangzhou 225009, Peoples R China
3.Jiangsu Acad Agr Sci, Prov Key Lab Agrobiol, Nanjing 210014, Peoples R China
关键词： rice; whiteness; quantitative trait loci; chromosomal segment substitution lines
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2024 年 13 卷 24 期
页码：
收录情况： SCI
摘要： The whiteness of rice grains (WRG) is a key indicator of appearance quality, directly impacting its commercial value. The trait is quantitative, influenced by multiple factors, and no specific genes have been cloned to date. In this study, we first examined the correlation between the whiteness of polished rice, cooked rice, and rice flour, finding that the whiteness of rice flour significantly correlated with both polished and cooked rice. Thus, the whiteness of rice flour was chosen as the indicator of WRG in our QTL analysis. Using a set of chromosome segment substitution lines (CSSL) with japonica rice Koshihikari as the recipient and indica rice Nona Bokra as the donor, we analyzed QTLs for WRG across two growth environments and identified six WRG QTLs. Notably, qWRG9 on chromosome 9 displayed stable genetic effects in both environments. Through chromosomal segment overlapping mapping, qWRG9 was narrowed to a 1.2 Mb region. Additionally, a BC4F2 segregating population confirmed that low WRG was a dominant trait governed by the major QTL qWRG9, with a segregation ratio of low to high WRG approximating 3:1, consistent with Mendelian inheritance. Further grain quality analysis on the BC4F2 population revealed that rice grains carrying the Indica-type qWRG9 allele not only exhibited lower WRG but also had significantly higher protein content. These findings support the fine mapping of the candidate gene and provide an important QTL for improving rice grain quality through genetic improvement.
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