Abstract

F2 progeny segregating for linolenic acid content were used to identify genes and develop markers for linolenic acid in spring turnip rape (Brassica rapa ssp. oleifera). A candidate gene approach applying the rapeseed fad3 gene and bulked segregant analysis with RAPD markers was used. A total of 27 markers were distributed in three linkage groups which each exhibited a QTL for linolenic acid. Jointly the three QTLs accounted for 73.5% of the variation in linolenic acid level in this population. The fad3 gene was mapped near one QTL controlling 23.5% of the variation. Allele-specific markers were developed for fad3 and can be used for marker-assisted selection in future spring turnip rape breeding programmes.

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