Identification and fine mapping of qGN1c, a QTL for grain number per panicle, in rice (Oryza sativa)
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Grain number per panicle (GN) is one of the most important determinants of grain yield potential in rice. However, the underlying genetic and molecular mechanisms that regulate GN remain largely unknown. In this study, quantitative trait loci (QTLs) for grain yield–related traits were detected using a set of chromosomal segment substitution lines (CSSLs) that were generated from a cross between the indica cultivar 9311 as the trait donor, and the japonica cultivar ‘Nipponbare’ as the recipient. In total, 25 QTLs for panicle-related traits, including GN, panicle length, primary branch number, and secondary branch number, were identified on eight chromosomes. Among the QTLs, qGN1c for GN was found to be located near Gn1a, a previously reported major QTL for GN on chromosome 1. Fine mapping placed qGN1c within a region of ~ 379 kb in a chromosomal interval flanking Gn1a, indicating that qGN1c is an uncloned gene. Evaluation of agronomic traits in a near isogenic line (NIL-qGN1c9311) suggested that qGN1c does not have additional impacts on agronomic traits except GN and thousand grain weight. More importantly, the grain yields per plant for the NIL-qGN1c9311 were significantly increased by 13.34% and 14.46% in two planting locations. Therefore, we conclude that the identification of qGN1c provides a useful genetic tool for the improvement of grain yield in rice breeding, and our findings will be helpful in cloning qGN1c.
KeywordsRice Grain yield Grain number per panicle qGN1c QTL mapping
Q.L., S.T., and Y.Z. conceived the study; Z.X., M.Y., Z.C., H.G., R.W., D.Z., and H.Z. performed the experiments and analyzed the data; Q.L., H.Z., and B.Z. reviewed and edited the article; and Z.X. wrote the article.
This study was supported by the National Natural Science Foundation of China (Grant Nos. 31771743 and 31701393), the Postdoctoral Science Foundation of China (Grant No. 2018M632395), and the Government of Jiangsu Province (BE2018357 and PAPD).
Compliance with ethical standards
The authors declare that they have no competing interests.
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