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QTL mapping for grain number per spikelet in wheat using a high-density genetic map

The Crop Journal 2021年第5期9卷 1108-1114页

作者： Yu Lin Xiaojun Jiang Haiyan Hu Kunyu Zhou Qing Wang Shifan Yu Xilan Yang Zhiqiang Wang Fangkun Wu Shihang Liu Caixia Li Mei Deng Jian Ma Guangdeng Chen Yuming Wei Youliang Zheng Yaxi Liu State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China WenjiangChengdu 611130SichuanChina Triticeae Research Institute Sichuan Agricultural UniversityWenjiangChengdu 611130SichuanChina School of Life Science and Technology Henan Institute of Science and TechnologyXinxiang 453003HenanChina College of Resources Sichuan Agricultural UniversityWenjiangChengdu 611130SichuanChina

Grain number per spikelet (GNS) is a key determinant of grain yield in wheat.A recombinant inbred line population comprising 300 lines was developed from a cross between a high GNS variety H461 and Chinese Spring from which the reference genome assembly of bread wheat was *** parents and the recombinant inbred lines were genotyped using the wheat 55K single nucleotide polymorphism(SNP) array.A high-density genetic map containing 21,197 SNPs was *** markers covered each of the 21 chromosomes with a total linkage distance of 3792.71 c *** of these markers in this linkage map were highly consistent with their physical locations in the genome assembly of Chinese *** two parents and the whole RIL population were assessed for GNS in two consecutive years at two different *** on multi-environment phenotype data and best liner unbiased prediction values,three quantitative trait loci (QTL) for GNS were *** of them located on chromosomes 2B and the other two on *** variation explained by these loci varied from 3.07%to26.57%.One of these QTL,***-2D-2,was identified in each of all trials *** on the best linear unbiased prediction values,this locus explained 19.59%–26.57%of phenotypic variation.A KASP(Kompetitive Allele-Specific PCR) marker closely linked with this locus was generated and used to validate the effects of this locus in three different genetic *** identified QTL and the KASP marker developed for it will be highly valuable in fine-mapping the locus and in exploiting it for markerassisted selection in wheat breeding programs.

关键词： Chinese Spring Grain number per spikelet high-density map KASP Quantitative trait locus

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