The Evolution of Haploid Chromosome Numbers in the Sunflower Family.

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Serval ID
serval:BIB_E3C893DF40CE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The Evolution of Haploid Chromosome Numbers in the Sunflower Family.
Journal
Genome Biology and Evolution
Author(s)
Mota L., Torices R., Loureiro J.
ISSN
1759-6653 (Electronic)
ISSN-L
1759-6653
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
8
Number
11
Pages
3516-3528
Language
english
Abstract
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.

Keywords
ancestral chromosome number, duplication, dysploidy, polyploidy, probabilistic models, sunflower family
Pubmed
Web of science
Open Access
Yes
Create date
18/02/2017 8:58
Last modification date
20/08/2019 16:07
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