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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Assignment of 3 genetic linkage groups to 3 chromosomes of narrow-leafed lupin.
Journal of Heredity 2011 March
The legume genus, Lupinus, has many notable properties that make it interesting from a scientific perspective, including its basal position in the evolution of Papilionoid legumes. As the most economically important legume species, L. angustifolius L. (narrow-leafed lupin) has been subjected to much genetic analysis including linkage mapping and genomic library development. Cytogenetic analysis has been hindered by the large number of small morphologically uniform chromosomes (2n = 40). Here, we present a significant advance: the development of chromosome-specific cytogenetic markers and assignment of the first genetic linkage groups (LGs) to chromosomal maps of L. angustifolius using the bacterial artificial chromosome (BAC)-fluorescence in situ hybridization approach. Twelve clones produced single-locus signals that "landed" on 7 different chromosomes. Based on BAC-end sequences of those clones, genetic markers were generated. Eight clones localized on 3 chromosomes, allowed these chromosomes to be assigned to 3 LGs. An additional single-locus clone may be useful to combine an unassigned group (Cluster-2) with main LGs. This work provides a strong foundation for future identification of all chromosomes with specific markers and for complete integration of narrow-leafed lupin LGs. This resource will greatly facilitate the chromosome assignment and ordering of sequence contigs in sequencing the L. angustifolius genome.
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