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| Cucumber Leaf Area Genetics and QTL Analysis |
| WU Peng1，2,QIN Zhi-wei1*,XIA Yuan1,ZHOU Xiu-yan1,WU Tao1 |
| 1Horticulture College,Northeast Agriculture University,Harbin 150030，Heilongjiang,China;2Forestry and Horticulture Institute,Xinjiang Agriculture and Reclamation Academy,Shihezi 832000,Xinjiang，China |
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Abstract Two large leaf area cucumber（Cusumis sativus L.）varieties(D9320,D2005)and two small leaf area cucumber varieties(D0455,D0401)were selected to build a hybrid combination.A parental combination with bigger leaf area difference D0401×D9320 was screened to build up self-isolated groups of F2 generation.Genetic analysis was conducted by using additivedominance(AD)model.The results showed that cucumber leaf area was a quantitative trait controlled by multi-genes.It took dominant effect as main character,and there were certain additive effects with higher narrow-sense and broad-sense heritability.SSR molecular markers were adopted to build genetic linkage map,using composite interval mapping methods for QTL location of cucumber leaf areas.The results showed that CSWACC03,CSWCT05BZ and CSCTTT15a were located on the same linkage group.The total length of linkage group was 68.3 cM.One QTL was detected in connection with cucumber leaf area.Its distance to the nearest marker was 3.6 cM and the contribution rate to mutation was 8.65 %.
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Received: 08 April 2009
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