Theoretical and Applied Genetics

, Volume 91, Issue 5, pp 802–808

RFLP mapping of quantitative trait loci controlling seed aliphatic-glucosinolate content in oilseed rape (Brassica napus L)

  • D. Toroser
  • C. E. Thormann
  • T. C. Osborn
  • R. Mithen
Article

Abstract

We report the RFLP mapping of quantitative trait loci (QTLs) which regulate the total seed aliphaticglucosinolate content in Brassica napus L. A population of 99 F1-derived doubled-haploid (DH) recombinant lines from a cross between the cultivars Stellar (low-glucosinolate) and Major (high-glucosinolate) was used for singlemarker analysis and the interval mapping of QTLs associated with total seed glucosinolates. Two major loci, GSL-1 and GSL-2, with the largest influence on total seed aliphatic-glucosinolates, were mapped onto LG 20 and LG 1, respectively. Three loci with smaller effects, GSL-3, GSL-4 and GSL-5, were tentatively mapped to LG 18, LG 4 and LG 13, respectively. The QTLs acted in an additive manner and accounted for 71 % of the variation in total seed glucosinolates, with GSL-1 and GSL-2 accounting for 33% and 17%, respectively. The recombinant population had aliphatic-glucosinolate levels of between 6 and 160 μmoles per g-1 dry wt of seed. Transgressive segregation for high seed glucosinolate content was apparent in 25 individuals. These phenotypes possessed Stellar alleles at GSL-3 and Major alleles at the four other GSL loci demonstrating that low-glucosinolate genotypes (i.e. Stellar) may possess alleles for high glucosinolates which are only expressed in particular genetic backgrounds. Gsl-elong and Gsl-alk, loci which regulate the ratio of individual aliphatic glucosinolates, were also mapped. Gsl-elong-1 and Gsl-elong-2, which control elongation of the α-amino-acid precursors, mapped to LG 18 and LG 20 and were coincident with GSL loci which regulate total seed aliphatic glucosinolates. A third tentative QTL, which regulates side-chain elongation, was tentatively mapped to LG 12. Gsl-alk, which regulates H3CS-removal and side-chain de-saturation, mapped to LG 20.

Key words

Aliphatic glucosinolates Brassica napus Restriction fragment length polymorphism (RFLP) Genomic mapping 

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • D. Toroser
    • 1
  • C. E. Thormann
    • 2
  • T. C. Osborn
    • 2
  • R. Mithen
    • 1
  1. 1.Brassica and Oilseeds ResearchThe John Innes CentreNorwichUK
  2. 2.Department of AgronomyUniversity of WisconsinMadisonUSA

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