Chromosome and genome size variation in Luzula (Juncaceae), a genus with holocentric chromosomes

0436262 - BÚ 2015 RIV GB eng J - Článek v odborném periodiku
Bozek, M. - Leitch, A. R. - Leitch, I. J. - Záveská Drábková, Lenka - Kuta, E.
Chromosome and genome size variation in Luzula (Juncaceae), a genus with holocentric chromosomes.
Botanical Journal of the Linnean Society. Roč. 170, č. 4 (2012), s. 529-541. ISSN 0024-4074. E-ISSN 1095-8339
Grant CEP: GA ČR GP206/07/P147
Institucionální podpora: RVO:67985939
Klíčová slova: chromosomal evolution * endopolyploidy * holokinetic chromosome * karyotype evolution * tetraploides * centromeres * TRNF intergenic spacer
Kód oboru RIV: EF - Botanika
Impakt faktor: 2.589, rok: 2012

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 (2n?=?666) and genome size (15-fold variation; 2C?=?0.568.51?pg; 547.78322.8?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
Trvalý link: http://hdl.handle.net/11104/0240028