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Genome size stability despite high chromosome number variation in Carex gr. laevigata

AutorEscudero, Marcial; Maguilla, Enrique; Loureiro, Joäo; Castro, Mariana; Castro, Silvia; Luceño, Modesto
Palabras claveAneuploidy
Cyperaceae
Cytogenetics
Genome evolution
Holocentric chromosome
Holokinetic drive
Fecha de publicación2015
EditorBotanical Society of America
CitaciónAmerican Journal of Botany, 102(2):233-238 (2015)
Resumenhypothesized to be a result of fi ssion, fusion, and/or translocation events. Negative, positive, or the absence of correlations have been found between chromosome number and genome size in Carex . • Methods: Using the inferred diploid chromosome number and 80 genome size measurements from 26 individuals and 20 populations of Carex gr. laevigata , we tested the null hypothesis of chromosome number evolution by duplication and deletion of whole chromosomes. • Key results: Our results show a signifi cant positive correlation between genome size and chromosome number, but the slope of such correlation supports the hypothesis of proliferation and removal of repetitive DNA fragments to explain genome size variation rather than duplication and deletion of whole chromosomes. • Conclusions: Our results refi ne the theory of the holokinetic drive: this mechanism is proposed to facilitate repetitive DNA removal (or any segmental deletion) when smaller homologous chromosomes are preferentially inherited, or repetitive DNA proliferation (or any segmental duplication) when larger homologs are preferred. This study sheds light on how karyotype evolution plays an important role in the diversification of the species of the genus Carex
Versión del editorhttp://dx.doi.org10.3732/ajb.1400433
URIhttp://hdl.handle.net/10261/112608
DOI10.3732/ajb.1400433
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