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Fine mapping KT1 on wheat chromosome 5A that conditions kernel dimensions and grain weight

文献类型： 外文期刊

作者： Kong, Zhongxin 1 ; Cheng, Ruiru 1 ; Yan, Haisheng 1 ; Yuan, Haiyun 1 ; Zhang, Yong 1 ; Li, Guoqiang 1 ; Jia, Haiyan 1 ; Xue, Shulin 1 ; Zhai, Wenling 1 ; Yuan, Yang 1 ; Ma, Zhengqiang 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Agr Sci, Crop Genom & Bioinformat Ctr, Nanjing 210095, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Coll Agr Sci, Natl Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China

3.Huaiyin Inst Agr Sci Xuhuai Reg Jiangsu, Huaian, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Germplasm Resources & Biotechnol, Nanjing, Peoples R China

5.Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, Kaifeng, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.574； 五年影响因子：5.662 ）

ISSN： 0040-5752

年卷期： 2022 年 135 卷 3 期

页码：

收录情况： SCI

摘要： Key message KT1 was validated as a novel thickness QTL with major effects on wheat kernel dimensions and weight and fine mapped to a 0.04 cM interval near the chromosome-5A centromere. Kernel size, the principal grain weight determining factor of wheat and a target trait for both domestication and artificial breeding, is mainly defined by kernel length (KL), kernel width (KW) and kernel thickness (KT), of which KW and KT have been shown to be positively related to grain weight (GW). Qkt.nau-5A, a major QTL for KT, was validated using the QTL near-isogenic lines (NILs) in three genetic backgrounds. Genetic analysis using two F-2 populations derived from the NILs showed that Qkt.nau-5A was dominant for thicker kernel and inherited like a single gene and therefore was designated as Kernel Thickness 1 (KT1). With 77 recombinant lines identified from a total of 19,160 F-2 plants from the two NIL-derived F-2 populations, KT1 was mapped to the 0.04 cM Xwgrb1356-Xwgrb1619 interval, which was near the centromere and displayed strong recombination suppression. The KT1 interval showed positive correlation with KW and GW and negative correlation with KL and therefore could be used in breeding for cultivars with round-shaped kernels that are beneficial to higher flour yield. KT1 candidate identification could be achieved through combination of sequence variation analysis with expression profiling of the annotated genes in the interval.

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