Acta Agriculturae Boreali-Sinica ›› 2025, Vol. 40 ›› Issue (4): 49-56. doi: 10.7668/hbnxb.20195550

Special Issue: Rice Biotechnology

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

Genome-wide Association Analysis of Total Protein Content in Rice Seeds

MAO Xinyuan1, DU Huaidong1, DONG Yue1, YU Xueran1,2, WANG Jingwen1, LI Peifu1,   

  1. 1 School of Agriculture,Ningxia University,Key Laboratory of Modern Molecular Breeding for Dominant and Special Crops in Ningxia,Yinchuan 750021,China
    2 Chifeng Institute of Agriculture and Animal Husbandry,Chifeng 024000,China
  • Received:2024-11-04 Published:2025-08-28

Abstract:

In order to cultivate good quality rice,it utilized 139 rice germplasm resources from home and abroad as materials to analyze the total protein content of rice grains in 2022-2023,combined with 255 501 SNP markers obtained from whole-genome sequencing(depth of coverage of 10×),and performed genome-wide linkage analysis by using a general linear model to avoid the influence of false positives to select the genes with the highest thresholds for haplotype analysis.The genes related to the total protein content of rice grains were predicted based on the results of previous studies and gene function annotation,and the relative expression of the predicted genes was analyzed by Real-time Fluorescence PCR.The results showed that the total protein content of 139 rice seeds belonged to moderate variation,with coefficients of variation of 21.66% and 20.65%,respectively,which conformed to the normal distribution.Through genome-wide association analysis,a total of 55 significant SNPs were obtained in both environments,distributed on chromosomes 1,2,4,5,6,8,11,and 12,of which 16 consecutive and with upstream and downstream intervals of no more than 100 kb SNPs were distributed on chromosome 11.Further haplotype analysis of genes with strong correlation between the upstream and downstream intervals within 50 kb(±50 kb)of the loci of significant SNPs on chromosome 11 was conducted,combined with the results of functional annotation of the genes and the analysis of the relative expression of the seed grain at the irrigating stage,we preliminarily hypothesized that LOC_Os11g08460 was associated with the total protein content of the seed grain of rice,which encodes the Dnak/Hsp70s protein family.In conclusion,candidate gene prediction and haplotype analysis of total protein content of 139 rice germplasm resources using genome-wide association analysis can provide new genes for genetic improvement of rice quality and accelerate the process of rice improvement.

Key words: Rice, Grain, Total protein content, Genome-wide association study, Candidate gene

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Cite this article

MAO Xinyuan, DU Huaidong, DONG Yue, YU Xueran, WANG Jingwen, LI Peifu. Genome-wide Association Analysis of Total Protein Content in Rice Seeds[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(4): 49-56. doi: 10.7668/hbnxb.20195550.

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