New evidence from Sinapis alba L. for ancestral triplication in a crucifer genome

Matthew Nelson, D.J. Lydiate

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    We present clear evidence of ancestral genome triplication in Sinapis alba, a close relative of the cultivated Brassica species. Exceptionally high levels of heterozygosity in the parents of an F, intercross permitted the mapping of an estimated 87% of all detected restriction fragment length polymorphism (RFLP) loci, with each RFLP probe typically detecting 2 or 3 loci. These duplicated loci were arranged in 8 triplicated homologous linkage blocks and 2 small, duplicated, homologous linkage blocks covering the majority of the S. alba genome. Several large-scale inversions and translocations appear to have rearranged the order of loci within homologous blocks. The role of successive polyploidization events on the evolution of crucifer species is discussed.
    Original languageEnglish
    Pages (from-to)230-238
    JournalGenome
    Volume49
    Issue number3
    DOIs
    Publication statusPublished - 2006

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