Genome-Wide Association Study Reveals the Genetic Basis of Total Flavonoid Content in Brown Rice
文献类型： 外文期刊
作者： Xia, Haijian 1 ; Pu, Xiaoying 2 ; Zhu, Xiaoyang 1 ; Yang, Xiaomeng 2 ; Guo, Haifeng 1 ; Diao, Henan 3 ; Zhang, Quan 1 ; Wang, Yulong 1 ; Sun, Xingming 1 ; Zhang, Hongliang 1 ; Zhang, Zhanying 1 ; Zeng, Yawen 2 ; Li, Zichao 1 ;
作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China
2.Yunnan Acad Agr Sci, Biotechnol & Germplasm Resources Inst, Agr Biotechnol Key Lab Yunnan Prov, Kunming 650205, Peoples R China
3.Heilongjiang Acad Agr Sci, Heihe Branch, Heihe 164300, Peoples R China
4.China Agr Univ, Sanya Inst, Sanya 572025, Peoples R China
关键词： flavonoid; functional rice; gene; germplasm resource; QTL
期刊名称：GENES （ 影响因子：3.5； 五年影响因子：3.9 ）
ISSN：
年卷期： 2023 年 14 卷 9 期
页码：
收录情况： SCI
摘要： Flavonoids have anti-inflammatory, antioxidative, and anticarcinogenic effects. Breeding rice varieties rich in flavonoids can prevent chronic diseases such as cancer and cardio-cerebrovascular diseases. However, most of the genes reported are known to regulate flavonoid content in leaves or seedlings. To further elucidate the genetic basis of flavonoid content in rice grains and identify germplasm rich in flavonoids in grains, a set of rice core collections containing 633 accessions from 32 countries was used to determine total flavonoid content (TFC) in brown rice. We identified ten excellent germplasms with TFC exceeding 300 mg/100 g. Using a compressed mixed linear model, a total of 53 quantitative trait loci (QTLs) were detected through a genome-wide association study (GWAS). By combining linkage disequilibrium (LD) analysis, location of significant single nucleotide polymorphisms (SNPs), gene expression, and haplotype analysis, eight candidate genes were identified from two important QTLs (qTFC1-6 and qTFC9-7), among which LOC_Os01g59440 and LOC_Os09g24260 are the most likely candidate genes. We also analyzed the geographic distribution and breeding utilization of favorable haplotypes of the two genes. Our findings provide insights into the genetic basis of TFC in brown rice and could facilitate the breeding of flavonoid-rich varieties, which may be a prevention and adjuvant treatment for cancer and cardio-cerebrovascular diseases.
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