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dc.contributor.authorHidalgo, Orianees_ES
dc.contributor.authorVitales, Danieles_ES
dc.contributor.authorVallès, Joanes_ES
dc.contributor.authorGarnatje, Teresaes_ES
dc.contributor.authorSiljak-Yakovlev, S.es_ES
dc.contributor.authorLeitch, Ilia J.es_ES
dc.contributor.authorPellicer, Jaumees_ES
dc.identifier.citationTaxon 66(1): 146–157 (2017)es_ES
dc.description146–157 p., tablas, gráficos -- El suplemento electrónico (Fig. S1) está disponible en la sección Supplementary Data de la versión online del artículo: http://www.ingentaconnect.com/content/iapt/tax/2017/00000066/00000001/art00009/supp-dataes_ES
dc.description.abstractThe genus Cheirolophus constitutes one of the most striking cases of species radiation in Macaronesia, where it diversified into a lineage of ca. 20 endemic species at a rate that is amongst the fastest reported for oceanic islands. Whilst the cytogenetic dynamics of many of the Macaronesian Cheirolophus species have been comparatively well studied, an overall vision of chromosome and genome evolution has been hampered by the lack of data for the earliestdiverging species, Ch. crassifolius. In this study, we have completed the cytogenetic survey of Cheirolophus to investigate how different cytogenetic traits may have contributed to the dramatic radiation of the genus in Macaronesia. We provide new cytogenetic data (i.e., chromosome counts, genome size estimates and physical mapping of 35S rDNA loci) for several key species, including Ch. crassifolius, and then model trait evolution within a phylogenetic context. Our results reveal a trend of genome downsizing accompanied by a dramatic increase in number of 35S rDNA loci which started early in the evolutionary history of the genus, before its radiation in Macaronesia. It is notable that the increasing number of 35S rDNA loci has not been driven by polyploidisation, in contrast to the more typical trend observed in many angiosperms. In addition, the number of 35S rDNA loci was observed to negatively correlate with genome size, which is also very unusual in angiosperms. It is suggested that nonhomologous and unequal homologous recombination are the most likely mechanisms to explain these observations and we discuss whether the unique genomic architectures of Cheirolophus could have predisposed the genus to its successful and rapid speciation in Macaronesia.es_ES
dc.description.sponsorshipThis work was subsidised by the Dirección General de Investigación Científica y Técnica, government of Spain (CGL2013-49097-C2-2-P), the Generalitat de Catalunya, government of Catalonia (“Ajuts a grups de recerca consolidats”, 2014SGR514). O.H. was supported by a Marie SklodowskaCurie Action program (CAPITULA – grant agreement no. 657λ1κ). D.V. benefited from a FPU grant from the Spanish Ministry of Education.es_ES
dc.publisherInternational Association for Plant Taxonomyes_ES
dc.subjectChromosome numberes_ES
dc.subjectGenomic trait evolutiones_ES
dc.subjectOceanic island radiationes_ES
dc.subjectrDNA locies_ES
dc.titleCytogenetic insights into an oceanic island radiation: The dramatic evolution of pre-existing traits in Cheirolophus (Asteraceae: Cardueae: Centaureinae)es_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderDirección General de Investigación Científica y Técnica, DGICT (España)es_ES
dc.contributor.funderGeneralitat de Catalunyaes_ES
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