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中国油料作物学报 ›› 2014, Vol. 36 ›› Issue (6): 695-.doi: 10.7505/j.issn.1007-9084.2014.06.001

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QTL mapping of plant height using high density SNP markers in Brassica napus

  

  1. Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Wuhan 430062, China
  • Online:2014-12-28 Published:2015-03-13

Abstract: Plant height is an important factor affecting the yield of oilseed rape. In order to find the markers linked with plant height and to increase the efficiency of plant height improvement by molecular marker-assisted selection, identification of quantitative trait loci (QTL) with single environment and multi-environment detection methods for plant height was conducted in a recombinant inbred lines (RILs) population derived from a cross between 888-5 (a dwarf line) and M083 (a tall line) by employing the newly developed Brassica napus 60K SNP array. The results indicated that a total of 27 putative QTLs for plant height in the 4 environments were detected on the chromosomes A2, A4, A5, A6, A9, A10, C3 and C7, each accounting for 0.70% - 26.10% of the phenotypic variation. Among them, 6 QTLs showed interaction with the environment, and their effect values in the 4 environments were different, but their directions were consistent. QTL qPHE2-4 which had the largest effect in the 27 QTLs was detected in 2 environments, explaining 17.96%-26.10% of the phenotypic variation, and 2 linkage SNP markers in this QTL region had less than 0.2 cM distance from the peak of the QTL.These QTLs provided useful information for improving the plant height in oilseed rape breeding.

Key words: Brassica napus, SNP, Plant height, QTL mapping