Identification of genetic loci for grain yield‑related traits in the wheat population Zhongmai 578/Jimai 22
2023
LIU Dan | ZHAO De-hui | ZENG Jian-qi | Rabiu Sani SHAWAI | TONG Jing-yang | LI Ming | LI Fa-ji | ZHOU Shuo | HU Wen-li | XIA Xian-chun | TIAN Yu-bing | ZHU Qian | WANG Chun-ping | WANG De-sen | HE Zhong-hu | LIU Jin-dong | ZHANG Yong
The identification of stable quantitative trait locus (QTL) for yield-related traits and tightly linked molecular markers isimportant for improving wheat grain yield. In the present study, six yield-related traits in a recombinant inbred line (RIL)population derived from the Zhongmai 578/Jimai 22 cross were phenotyped in five environments. The parents and 262RILs were genotyped using the wheat 50K single nucleotide polymorphism (SNP) array. A high-density genetic mapwas constructed with 1 501 non-redundant bin markers, spanning 2 384.95 cM. Fifty-three QTLs for six yield-relatedtraits were mapped on chromosomes 1D (2), 2A (9), 2B (6), 2D, 3A (2), 3B (2), 4A (5), 4D, 5B (8), 5D (2), 7A (7), 7B (3)and 7D (5), which explained 2.7–25.5% of the phenotypic variances. Among the 53 QTLs, 23 were detected in at leastthree environments, including seven for thousand-kernel weight (TKW), four for kernel length (KL), four for kernel width(KW), three for average grain filling rate (GFR), one for kernel number per spike (KNS) and four for plant height (PH).The stable QTLs QKl.caas-2A.1, QKl.caas-7D, QKw.caas-7D, QGfr.caas-2B.1, QGfr.caas-4A, QGfr.caas-7A and QPh. caas-2A.1 are likely to be new loci. Six QTL-rich regions on 2A, 2B, 4A, 5B, 7A and 7D, showed pleiotropic effects onvarious yield traits. TaSus2-2B and WAPO-A1 are potential candidate genes for the pleiotropic regions on 2B and 7A, respectively. The pleiotropic QTL on 7D for TKW, KL, KW and PH was verified in a natural population. The results ofthis study enrich our knowledge of the genetic basis underlying yield-related traits and provide molecular markers forhigh-yield wheat breeding.
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