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Linkage maps for Arabidopsis lyrata subsp. lyrata and Arabidopsis lyrata subsp. petraea combining anonymous and Arabidopsis thaliana-derived markers

, : Linkage maps for Arabidopsis lyrata subsp. lyrata and Arabidopsis lyrata subsp. petraea combining anonymous and Arabidopsis thaliana-derived markers. Genome 50(2): 142-150

Arabidopsis lyrata, a close relative of the model plant Arabidopsis thaliana, is I of a few plant species for which the genome is to be entirely sequenced, which promises to yield important insights into genome evolution. Only 2 sparse linkage maps have been published, and these were based solely on markers derived from the A. thaliana genome. Because the genome of A. lyrata is practically twice as large as that of A. thaliana, the extent of map coverage of the A. lyrata genome remains uncertain. In this study, a 2-way pseudo-testcross strategy was used to construct genetic linkage maps of A. lyrata subsp. petraea and A. lyrata subsp. lyrata, using simple sequence repeat (SSR) and cleaved amplified polymorphic sequence (CAPS) markers from the A. thaliana genome, and anonymous. amplified fragment length polymorphism (AFLP) markers that could potentially uncover regions unique to the A. lyrata genome. The SSR and CAPS markers largely confirmed the relationships between linkage groups in A. lyrata and A. thaliana. AFLP markers slightly increased the coverage of the A. lyrata maps, but mostly increased marker density on the linkage groups. We noted a much lower level of polymorphism and a greater segregation distortion in A. lyrata subsp. lyrata markers. The implications of these findings for the sequencing of the A. lyrata genome are discussed.


PMID: 17546079

DOI: 10.1139/g06-144

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