文献类型： 外文期刊

作者： Zhu Hongyan ¹ ; Li Xianming ¹ ; Yang Fuchen ¹ ; Tu Junfan ¹ ; Yang Li ¹ ; Wu Tao ¹ ; Qin Zhongqi ¹ ; Yu Dazhao ² ;

作者机构： 1.Hubei Acad Agr Sci, Inst Fruit & Tea, Wuhan 430064, Peoples R China

2.Wuhan Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China

3.Minist Agr, Key Lab Integrated Pest Management Crop Cent Chin, Wuhan 430064, Peoples R China

关键词： Sand pear; Linkage map; SLAF-seq; Black spot disease; Ubiquitin; Marker-assisted breeding; Molecular makers

期刊名称：JOURNAL OF APPLIED GENETICS （ 影响因子：2.653； 五年影响因子：2.952 ）

ISSN： 1234-1983

年卷期：

页码：

收录情况： SCI

摘要： Black spot disease (PBS) caused by Alternaria alternata is an economic disease of pear (Pyrus pyrifolia Nakai). Developing cultivars with durable PBS resistance traits is an important research objective for improving pear germplasm. The Desh-engxiang is a popular pear variety in China and resistant to PBS. This study aimed to detect quantitative trait loci (QTL) associated with PBS resistance trait in pear and determine closely linked molecular markers by specific locus amplified fragment sequencing (SLAF-seq). F1 population resulting from a cross between "Deshengxiang" (female) and "Guiguan," a susceptible (male) variety, was developed and evaluated in 2016 and 2017. SLAF technology was used to discover SNPs in the F1 individuals and subsequently a high-density genetic linkage map for PBS resistance was constructed which contained 17,604 SNP markers. Based on the linkage map, the markers were distributed into 17 linkage groups, spanning 1548.48 cM, with a mean marker distance of 0.09 cM, representing the densest genetic map of the genus Pyrus. QTL analysis of PBS resistance identified a locus strongly related to PBS resistance at 77.68 similar to 112.99 cM on linkage group 15, which was further narrowed down to 93.79 similar to 112.99 cM. Two markers, Marker94293 and Marker94206, located at 97.47 and 102.93 cM, were closely associated with PBS resistance, with a Delta (SNP index) value of 0.46. Co-localization of QTL interval, bioinformatics analysis, and functional annotation revealed PBS putative candidate genes. Overall, the high-density pear linkage map is a suitable reference for mapping PBS resistance trait, QTL, and genes identified in this study contribute information that could be useful for PBS improvement in pear.