Genome-wide association study reveals new loci for yield-related traits in Sichuan wheat germplasm under stripe rust stress

BMC Genomics

Chunji Liu¹  Youliang Zheng²  Wei Li³  Yukun Cheng⁴  Yuqi Wang⁴  Yunfeng Jiang⁴  Jian Ma⁴  Fangjie Yao⁴  Yuming Wei⁴  Xueling Ye⁴  Guoyue Chen⁴  Houyang Kang⁴  Yaxi Liu⁴  Jian Li⁴  Li Long⁴  Jing Li⁴  Qiantao Jiang⁴  Yu Wu⁴  Xiujin Lan⁴  Jirui Wang⁴  Pengfei Qi⁴  Xianming Chen⁵ 

[1] and Department of Plant Pathology, Washington State University;CSIRO Agriculture and Food;College of Agronomy, Sichuan Agricultural University;Triticeae Research Institute, Sichuan Agricultural University;US Department of Agriculture, Agricultural Research Service, Wheat Health, Genetics and Quality Research Unit;

关键词: Wheat;    55 K SNP;    Genome-wide association study;    Yield-related traits;    Stripe rust;   

DOI  :  10.1186/s12864-019-6005-6

来源: DOAJ

【 摘 要 】

Abstract Background As one of the most important food crops in the world, increasing wheat (Triticum aestivum L.) yield is an urgent task for global food security under the continuous threat of stripe rust (caused by Puccinia striiformis f. sp. tritici) in many regions of the world. Molecular marker-assisted breeding is one of the most efficient ways to increase yield. Here, we identified loci associated to multi-environmental yield-related traits under stripe rust stress in 244 wheat accessions from Sichuan Province through genome-wide association study (GWAS) using 44,059 polymorphic markers from the 55 K single nucleotide polymorphism (SNP) chip. Results A total of 13 stable quantitative trait loci (QTLs) were found to be highly associating to yield-related traits, including 6 for spike length (SL), 3 for thousand-kernel weight (TKW), 2 for kernel weight per spike (KWPS), and 2 for both TKW and KWPS, in at least two test environments under stripe rust stress conditions. Of them, ten QTLs were overlapped or very close to the reported QTLs, three QTLs, QSL.sicau-1AL, QTKW.sicau-4AL, and QKWPS.sicau-4AL.1, were potentially novel through the physical location comparison with previous QTLs. Further, 21 candidate genes within three potentially novel QTLs were identified, they were mainly involved in the regulation of phytohormone, cell division and proliferation, meristem development, plant or organ development, and carbohydrate transport. Conclusions QTLs and candidate genes detected in our study for yield-related traits under stripe rust stress will facilitate elucidating genetic basis of yield-related trait and could be used in marker-assisted selection in wheat yield breeding.

【 授权许可】

Unknown