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- Title
Chromosome and genome size variation in Luzula ( Juncaceae), a genus with holocentric chromosomes.
- Authors
Bozek, Monika; Leitch, Andrew R.; Leitch, Ilia J.; Záveská Drábková, Lenka; Kuta, Elżbieta
- Abstract
The present study examines chromosome and genome size evolution in Luzula (woodrush; Juncaceae), a monocot genus with holocentric chromosomes. Detailed karyotypes and genome size estimates were obtained for seven Luzula spp., and these were combined with additional data from the literature to enable a comprehensive cytological analysis of the genus. So that the direction of karyotype and genome size changes could be determined, the cytological data were superimposed onto a phylogenetic tree based on the trnL- F and internal transcribed spacer ( ITS) DNA regions. Overall, Luzula shows considerable cytological variation both in terms of chromosome number (2 n = 6-66) and genome size (15-fold variation; 2 C = 0.56-8.51 pg; 547.7-8322.8 Mb). In addition, there is considerable diversity in the genomic mechanisms responsible, with the range of karyotypes arising via agmatoploidy (chromosome fission), symploidy (chromosome fusion) and/or polyploidy accompanied, in some cases, by the amplification or elimination of DNA. Viewed in an evolutionary framework, no broad trend in karyotype or genome evolution was apparent across the genus; instead, different mechanisms of karyotype evolution appear to be operating in different clades. It is clear that Luzula exhibits considerable genomic flexibility and tolerance to large, genome-scale changes. © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 170, 529-541.
- Subjects
LUZULA; CHROMOSOMES; GENOMES; JUNCACEAE; GENETICS; GENOMICS
- Publication
Botanical Journal of the Linnean Society, 2012, Vol 170, Issue 4, p529
- ISSN
0024-4074
- Publication type
Article
- DOI
10.1111/j.1095-8339.2012.01314.x