Abstract
The cucumber lines, S94 (Northern China open-field type, powdery mildew (PM) susceptible) and S06 (European greenhouse type, PM resistant), and their F6:7 populations were used to investigate PM resistance under seedling spray inoculation in 2005/Autumn and 2006/Spring. QTL analysis was undertaken based on a constructed molecular linkage map of the corresponding F6 population using composite interval mapping. A total of four QTLs (pm1.1, pm2.1, pm4.1 and pm6.1) for PM resistance were identified and located on LG 1, 2, 4 and 6, respectively, explaining 5.2%–21.0% of the phenotypic variation. Three consistent QTLs (pm1.1, pm2.1 and pm4.1) were detected under the two test conditions. The QTL pm6.1 was only identified in 2005/Autumn. The total phenotypic variation explained by the QTLs was 52.0% and 42.0% in 2005/Autumn and 2006/Spring, respectively. Anchor markers tightly linked to those loci (<5 cM) could lay a basis for both molecular marker-assisted breeding and map-based gene cloning of the PM-resistance gene in cucumber.
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Supported by grant from the Science and Technology Commission of Shanghai Municipality (Grant No. 06JC14035) and Shanghai Leading Academic Discipline Project (Grant No. B209)
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Liu, L., Cai, R., Yuan, X. et al. QTL molecular marker location of powdery mildew resistance in cucumber (Cucumis sativus L.). SCI CHINA SER C 51, 1003–1008 (2008). https://doi.org/10.1007/s11427-008-0110-0
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DOI: https://doi.org/10.1007/s11427-008-0110-0