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Genome-Wide Association Mapping of Late Blight Tolerance Trait in Potato (Solanum tuberosum L.)

文献类型： 外文期刊

作者： Wang, Fang 1 ; Zou, Meiling 5 ; Zhao, Long 1 ; Xia, Zhiqiang 5 ; Wang, Jian 1 ;

作者机构： 1.Qinghai Univ, Acad Agr & Forestry Sci, Xining, Peoples R China

2.Qinghai Univ, Natl Key Lab Sanjiangyuan Ecol & Plateau Agr & An, Xining, Peoples R China

3.Minist Educ, Key Lab Qinghai Tibet Plateau Biotechnol, Xining, Peoples R China

4.Qinghai Prov Key Lab Potato Breeding, Xining, Peoples R China

5.Hainan Univ, Coll Trop Crops, Haikou, Hainan, Peoples R China

6.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou, Hainan, Peoples R China

关键词： Solanum tuberosum L; single-nucleotide polymorphism (SNP); genome-wide association analysis (GWAS); population structure; genetic diversity; late blight tolerance

期刊名称：FRONTIERS IN GENETICS （ 影响因子：4.599； 五年影响因子：4.888 ）

ISSN：

年卷期： 2021 年 12 卷

页码：

收录情况： SCI

摘要： Uncovering the genetic basis and optimizing the late blight tolerance trait in potatoes (Solanum tuberosum L.) are crucial for potato breeding. Late blight disease is one of the most significant diseases hindering potato production. The traits of late blight tolerance were evaluated for 284 potato cultivars to identify loci significantly associated with the late blight tolerance trait. Of all, 37 and 15 were the most tolerant to disease, and 107 and 30 were the most susceptible. A total of 22,489 high-quality single-nucleotide polymorphisms and indels were identified in 284 potato cultivars. All the potato cultivars were clustered into eight subgroups using population structure analysis and principal component analysis, which were consistent with the results of the phylogenetic tree analysis. The average genetic diversity for all 284 potato cultivars was 0.216, and the differentiation index of each subgroup was 0.025-0.149. Genome-wide linkage disequilibrium (LD) analysis demonstrated that the average LD was about 0.9 kb. A genome-wide association study using a mixed linear model identified 964 loci significantly associated with the late blight tolerance trait. Fourteen candidate genes for late blight tolerance traits were identified, including genes encoding late blight tolerance protein, chitinase 1, cytosolic nucleotide-binding site-leucine-rich repeat tolerance protein, protein kinase, ethylene-responsive transcription factor, and other potential plant tolerance-related proteins. This study provides novel insights into the genetic architecture of late blight tolerance traits and will be helpful for late blight tolerance in potato breeding.

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