Construction of a genetic linkage map and QTL analysis for some leaf traits in pear (Pyrus L .)

• 来源期刊: 中国高等学校学术文摘·农学
• 关键词: Pyrus L. molecular linkage map QTL analysis leaf traits
• 年，卷（期）: 2009,（1）
• 页码范围: 67-74
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s11703-009-0013-2

摘要

The major incompatibility barriers to specific inbred lines and the long generation duration in Pyrus L. May hinder the Pyrus breeding process. A genetic linkage map provides the foundation for quantitative trait loci (QTL) mapping and molecular marker-assisted breeding. In this study, we constructed a genetic map with 145 F1 populations from a cross of two cultivars, Yali and Jingbaili, using AFLP and SSR markers. The map consisted of 18 linkage groups which included 402 genetic markers and covered 1395.9 cM, with an average genetic distance of 3.8 cM. The interval mapping was used to identify quantitative trait loci associated with four leaf agronomic traits in the F1 population. The results indicated that four QTLs were associated with leaf length, two QTLs with leaf width, two with leaf length/leaf width, and three with petiole length. The eleven QTLs were associated with 9.9%-48.5% of the phenotypic variation in different traits. It is considered that the map covers almost the whole genome, and molecular markers will be greatly helpful to the related breeding.