Mapping loci controlling the concentrations of erucic and linolenic acids in seed oil of Brassica napus L. (original) (raw)
Abstract
The quality of plant oil is determined by its component fatty acids. Relatively high levels of linolenic acid reduce the oxidative stability of the oil, and high levels of erucic acid in the diet have been associated with health problems. Thus, oilseed Brassica napus cultivars with low linolenic and low erucic acid contents are highly desirable for edible oil production. In order to identify genes controlling the levels of erucic and linolenic acids, we analyzed the oil composition of 99 F1-derived doubled haploid lines from a cross between cv ‘Major’ (high levels of erucic and linolenic acids) and cv ‘Stellar’ (low levels of both fatty acids). A molecular marker linkage map of 199 loci for this population was used to identify quantitative trait loci (QTL) controlling oil composition. We identified two regions that accounted for nearly all of the phenotypic variation in erucic acid concentration and one region that accounted for 47% of the variation in linolenic acid concentration. The QTL associated with linolenic acid concentration mapped near a RFLP locus detected by a cDNA clone encoding an omega-3 desaturase, suggesting that the low linolenic acid content of ‘Stellar’ may be due to a mutation in this gene.
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Authors and Affiliations
- Department of Agronomy, University of Wisconsin, 53706, Madison, WI, USA
C. E. Thormann & T. C. Osborn - Mycogen Plant Sciences, 5649 E. Buckeye Rd., 53716, Madison, WI, USA
J. Romero - Semences Cargill, Boissay, BP. 17, 28310, Toury, France
J. Mantet
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- C. E. Thormann
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Communicated by G. E. Hart
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Thormann, C.E., Romero, J., Mantet, J. et al. Mapping loci controlling the concentrations of erucic and linolenic acids in seed oil of Brassica napus L..Theoret. Appl. Genetics 93, 282–286 (1996). https://doi.org/10.1007/BF00225758
- Received: 27 September 1995
- Accepted: 17 November 1995
- Issue Date: July 1996
- DOI: https://doi.org/10.1007/BF00225758