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QTL MAPPING FOR EARLY VIGOR RELATED TRAITS IN AN ELITE WHEAT-BREEDING PARENT CHUANMAI 42 DERIVED FROM SYNTHETIC HEXAPLOID WHEAT

文献类型： 外文期刊

作者： Li, Jun 1 ; Wan, Hongshen 1 ; Wei, Huiting 2 ; Wang, Qin 1 ; Zhou, Yonghong 3 ; Yang, Wuyun 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Crop Res Inst, Key Lab Wheat Biol & Genet Improvement Southweste, Minist Agr, Chengdu 610066, Sichuan, Peoples R China

2.Sichuan Acad Agr Sci, Plant Protect Inst, Chengdu 610066, Sichuan, Peoples R China

3.Sichuan Agr Univ, Triticeae Res Inst, Wenjiang 611130, Peoples R China

关键词： Wheat; Chuanmai 42; early vigor; QTL; DArT markers

期刊名称：PAKISTAN JOURNAL OF AGRICULTURAL SCIENCES （ 影响因子：0.748； 五年影响因子：0.854 ）

ISSN： 0552-9034

年卷期： 2018 年 55 卷 1 期

页码：

收录情况： SCI

摘要： Seedling growth is one essential component of reliable crop establishment, and greater early vigor is often associated with greater drought tolerance, biomass and grain yield Chuanmai 42 derived from synthetic hexaploid wheat has been widely used as an elite wheat-breeding parent in wheat breeding program of Southwest China In this study, 127 recombinant inbred lines (RILs) developed from Chuanmai 42 were used to dissect the molecular basis of its great early vigor by QTL mapping, and seven early vigor related traits including number of all expanded leaves, total leaf area, shoot fresh weight, shoot dry weight, number of the main roots, root dry weight and relative growth rate were evaluated for this RILs after 21-day and 28-day growth under a modified Hoagland nutrient solution, respectively. Based on a linkage map containing 148 S SR and 644 DArT makers, a total of 40 QTLs for these traits were detected on 14 chromosomes. Among the 25 QTLs with the phenotypic variance explained more than 10%, 17 QTLs enhanced the related traits through Chuanmai 42 alleles. A total of 4 genomic regions with QTL clusters were detected on chromosomes 5A, 6A, 6B and 7A, respectively. Among them, the genomic regions with QTL clusters on 6B and 7A from Chuanmai 42 enhanced early vigor of seedling, and the other two were from Chuannong 16. Moreover, QTL cluster in Xgwm154-Wpt7846 of chromosome 6B was the important genomic region with the strongest phenotypic effects that were also strengthened during elongation of the growth period. The findings of this study are relevant to the molecular improvement of early vigor when using Chuanmai 42 as a breeding parent.

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