A new biological species in the Mercurialis annua polyploid complex: functional divergence in inflorescence morphology and hybrid sterility.

Détails

ID Serval
serval:BIB_8EE79D3E6607
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A new biological species in the Mercurialis annua polyploid complex: functional divergence in inflorescence morphology and hybrid sterility.
Périodique
Annals of botany
Auteur(s)
Ma W.J., Santos Del Blanco L., Pannell J.R.
ISSN
1095-8290 (Electronic)
ISSN-L
0305-7364
Statut éditorial
Publié
Date de publication
02/08/2019
Peer-reviewed
Oui
Volume
124
Numéro
1
Pages
165-178
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Polyploidy has played a major role in the origin of new plant species, probably because of the expansion of polyploid populations in the species' ecological niche, and because reproductive isolation can be established between a new polyploid population and its diploid progenitor species. It is well established that most polyploid species are polyphyletic, with multiple independent origins, and that polyploid genomes may undergo rapid change after their duplication and hybridization associated with their origin. We considered whether multiple independent origins and rapid genomic change might lead to reproductive isolation between polyploid populations of the same ploidy but with potentially different evolutionary histories.
We tested our hypothesis by assessing differences in DNA content and morphology, the evolution of reproductive isolation, and the phylogenetic placement of two broadly sympatric hexaploid lineages of the wind-pollinated annual plant Mercurialis annua hitherto regarded as populations of the same species.
The two hexaploid lineages of M. annua have slightly divergent DNA content, and distinct inflorescence morphology. They also fall into largely different clades of a chloroplast phylogeny and are reproductively isolated from one another.
The distinct evolutionary histories of the two hexaploid lineages of M. annua have contributed to the remarkable reproductive diversity of the species complex. It seems likely that reproductive interference between them will eventually lead to the displacement of one lineage by the other via pollen swamping. Thus, whereas polyploidization can contribute to speciation, diversification might also be compromised by reproductive interference.
Mots-clé
Male-like inflorescence, evolutionary origin, female sterility, functional divergence, phylogeny, polyploidy, reproductive isolation
Pubmed
Open Access
Oui
Création de la notice
25/05/2019 13:47
Dernière modification de la notice
21/08/2019 6:34
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