genome-wide linkage mapping of qtl for yield components, plant height and yield-related physiological traits in the chinese wheat cross zhou 8425b/chinese spring

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ID: 176577
2015
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Abstract
Identification of genes for yield components, plant height and yield-related physiological traits and tightly linked molecular markers is of great importance in marker-assisted selection (MAS) in wheat breeding. In the present study, 246 F8 RILs derived from the cross of Zhou 8425B/Chinese Spring were genotyped using the high-density Illumina iSelect 90K single nucleotide polymorphism (SNP) assay. Field trials were conducted at Zhengzhou and Zhoukou of Henan Province, during the 2012–2013 and 2013–2014 cropping season sunder irrigated conditions, providing data for four environments. Analysis of variance (ANOVA) of agronomic and physiological traits revealed significant differences (P<0.01) among RILs, environments, and RIL × environment interactions. Broad-sense heritabilities of all traits including thousand kernel weight (TKW), plant height (PH), spike length (SL), kernel number per spike (KNS), spike number/m2 (SN), normalized difference in vegetation index at anthesis (NDVI-A) and at 10 days post-anthesis (NDVI-10), SPAD value of chlorophyll content at anthesis (Chl-A) and at 10 days post-anthesis (Chl-10) ranged between 0.65 and 0.94. A linkage map spanning 3,609.4 cM was constructed using 5,636 polymorphic SNP markers, with an average chromosome length of 171.9 cM and marker density of 0.64 cM/marker. A total of 866 SNP markers were newly mapped to the hexaploid wheat linkage map. Eighty-six QTL for yield components, plant height and yield-related physiological traits were detected on 18 chromosomes except 1D, 5D and 6D, explaining 2.3 to 33.2% of the phenotypic variance. Ten stable QTL were identified across four environments, viz. QTKW.caas-6A.1, QTKW.caas-7AL, QKNS.caas-4AL, QSN.caas-1AL.1, QPH.caas-4BS.2, QPH.caas-4DS.1, QSL.caas-4AS, QSL.caas-4AL.1, QChl-A.caas-5AL and QChl-10.caas-5BL. Meanwhile, 10 QTL-rich regions were found on chromosome 1BS, 2AL (2), 3AL, 4AL (2), 4BS, 4DS, 5BL and 7AL exhibiting pleiotropic effects. These QTL or QTL clusters are tightly linked to SNP markers, with genetic distances to the closest SNPs ranging from 0 to 1.5 cM, and could serve as target regions for fine mapping, candidate gene discovery, and marker-assisted selection in wheat breeding.
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egao2015frontiersgenome-wide Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Fengmei eGao;Fengmei eGao;Fengmei eGao;Weie eWen;Jindong eLiu;Awais eRasheed;Awais eRasheed;Guihong eYin;Xianchun eXia;Xiaoxia eWu;Zhonghu eHe;Zhonghu eHe
Journal phytochemistry letters
Year 2015
DOI
10.3389/fpls.2015.01099
URL
http://journal.frontiersin.org/Journal/10.3389/fpls.2015.01099/full
Keywords
triticum aestivum qtl linkage analysis molecular marker

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