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RFLP linkage analysis and mapping genes controlling the fatty acid profile of Brassica juncea using reciprocal DH populations

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Abstract

An RFLP linkage map, comprising 300 linked and 16 unlinked loci, was constructed using reciprocal DH populations of Brassica juncea. The linked loci were organized into 18 linkage groups and seven unlinked segments, covering a total map distance of 1,564 cM. The A and B genomes were identified. The χ2 test showed that 96.1% of the common intervals in the two populations differed non-significantly for recombination fractions, thus strongly suggesting the absence of sex-based differences for recombination fractions in B. juncea. Two QTLs, E1a and E1b, significantly affected erucic acid content, and individually explained 53.7% and 32.1%, respectively, and collectively 85.8% of the phenotypic variation in the population. The QTLs E1a and E1b showed epistasis, and the full model including epistasis explained nearly all of the phenotypic variation in the population. The QTLs E1a and E1b were also associated with contents of oleic, linoleic and linolenic acids. Three additional QTLs (LN2, LN3 and LN4) significantly influenced linolenic acid content. The QTL LN2 accounted for 35.4% of the phenotypic variation in the population. Epistatic interactions were observed between the QTLs E1a and LN2. The stability of the detected QTLs across years and locations, and breeding strategies for improving the fatty acid profile of B. juncea, are discussed.

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Acknowledgements

We express thanks to Dr. Reinhold Mayerhofer, for his valuable help in data analysis and interpretation, and Dr. T. C. Osborn, for providing RFLP probes. Financial support from the Canadian Wheat Board, Alberta Canola Producers Commission, and Dow Agro Sciences is gratefully acknowledged.

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Authors and Affiliations

  1. Lembke Research Ltd, P.O Box 2499, Morden, MB, R6M 1C2

    T. Mahmood

  2. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E1

    U. Ekuere & A. G. Good

  3. Department of Renewable Resources, University of Alberta, Edmonton, Alberta, T6G 2H1

    F. Yeh

  4. Department of AFNS, University of Alberta, Edmonton, Alberta, T6G 2P5

    G. R. Stringam

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  1. T. Mahmood
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  2. U. Ekuere
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  3. F. Yeh
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  4. A. G. Good
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  5. G. R. Stringam
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Correspondence to G. R. Stringam.

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Communicated by J. Dvorak

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Mahmood, T., Ekuere, U., Yeh, F. et al. RFLP linkage analysis and mapping genes controlling the fatty acid profile of Brassica juncea using reciprocal DH populations. Theor Appl Genet 107, 283–290 (2003). https://doi.org/10.1007/s00122-003-1244-x

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  • DOI: https://doi.org/10.1007/s00122-003-1244-x

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