Fig 32
Source publication
The generic name Corymbium was employed by Linnaeus in Corollarium Generum Plantarum (Linnaeus 1737), Hortus Cliff ortianus (Linnaeus 1738), and Genera Plantarum ed. 2 (Linnaeus 1742) and ascribed to Gronovius (in Burman's Rariorum Africanarum Plantarum, 1738–39). With valid pub-lication in Species Plantarum (Linnaeus 1753) the offi cial name becam...
Citations
Chromosome number changes during the evolution of angiosperms are likely to have played a major role in speciation. Their study is of utmost importance, especially now, as a probabilistic model is available to study chromosome evolution within a phylogenetic framework. In the present study, likelihood models of chromosome number evolution were fitted to the largest family of flowering plants, the Asteraceae. Specifically, a phylogenetic supertree of this family was used to reconstruct the ancestral chromosome number and infer genomic events. Our approach inferred that the ancestral chromosome number of the family is n = 9. Also, according to the model that best explained our data, the evolution of haploid chromosome numbers in Asteraceae was a very dynamic process, with genome duplications and descending dysploidy being the most frequent genomic events in the evolution of this family. This model inferred more than one hundred whole genome duplication events, however it did not find evidence for a paleopolyploidization at the base of this family, which has previously been hypothesized on the basis of sequence data from a limited number of species. The obtained results and potential causes of these discrepancies are discussed.