Karyological evolution in Rhaponticum Vaill. (Asteraceae, Cardueae) and related genera |
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Authors: | ORIANE HIDALGO ,NÚ RIA GARCIA-JACAS,TERESA GARNATJE,ALFONSO SUSANNA, SONJA SILJAK-YAKOVLEV |
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Affiliation: | Institut Botànic de Barcelona (CSIC-ICUB), Passeig del Migdia s. n., Parc de Montjuïc, 08038 Barcelona, Catalonia, Spain; Département Biodiversité, Systématique et Evolution, UMR-CNRS 8079, UniversitéParis-Sud, Bât. 360, 91405 Orsay Cedex, France |
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Abstract: | Chromosome counts are reported in 29 populations representing 20 species and one subspecies of the genera Callicephalus (one sp.), Klasea (seven spp.), Myopordon (two spp.), Oligochaeta (one sp.), and Rhaponticum (nine spp., one ssp.). Eleven reports are new, the others supplement limited previous data. New and published cytological data are summarized and evaluated critically in light of current taxonomic treatments and evolutionary hypotheses. Basic chromosome numbers are a valuable source of taxonomic information and relate well to the phylogeny. They are quite conserved in Klasea (only x = 15), the sister group of the remaining genera, and in the early branching genera of the Rhaponticum group ( x = 14 for Centaurothamnus and Callicephalus ). However, a more complex pattern of genome evolution is present among the more derived clades, Oligochaeta plus Myopordon ( x = 12, 14) and the genus Rhaponticum ( x = 12, 13). The occurrence of x = 12 in Oligochaeta divaricata and Rhaponticum carthamoides seems to be the result of a recent event of chromosome fusion, as suggested by the fragility of particularly long pairs of chromosomes. The use of chromomycin staining, including an enzymatic digestion step that facilitates spreading and permits a reduction of potential fragmentation, only partially resolves this problem. © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society , 2007, 153 , 193–201. |
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Keywords: | Centaureinae chromomycin A3 banding chromosome basic number Compositae dysploidy Klasea polyploidy symploidy |
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