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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (1) : 67-74     DOI: 10.1007/s11703-009-0013-2
Construction of a genetic linkage map and QTL analysis for some leaf traits in pear (Pyrus L.)
Wenying SUN1, Yuxing ZHANG1(), Wenying SUN2, Wenquan LE3, Hai’e ZHANG3
1. Key Laboratory of Fruit Setting Physiology and Molecular Biology, Agricultural University of Hebei, Baoding 071001, China,; 2. Plant Science Department, Henan Vocational College of Agriculture, Zhengzhou 451450, China; 3. Hebei Changli Institute of Pomology, Changli 066600, China
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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.

Keywords Pyrus L      molecular linkage map      QTL analysis      leaf traits     
Corresponding Authors: ZHANG Yuxing,   
Issue Date: 05 March 2009
URL:     OR
Fig.3  Molecular genetic maps in pear based on AFLP and SSR markers
Fig.4  The frequency distribution of four leaf traits in pear mapping population
traitlinkage groupQTLLODthe nearest markerposition/cMdistance/cMExpl/%
leaf lengthLG8pyc-12.47McaaEact147m40.30.210.7
leaf widthLG10pyk-12.50McttEaat200m56.80.248.5
leaf length /widthLG5ycw-12.57McaaEaaa443f14.50.57.9
petiole lengthLG4ybc-13.66MctaEact350f8.20.239.2
Tab.1  The QTLs distribution of 4 leaf traits in pear genetic linkage map
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