Radiative evolution of polyploid races of the Iberian carnation Dianthus broteri (Caryophyllaceae)

The micro-evolutionary mechanisms that drive large-scale radiations are not completely understood, partly because of a shortage of population-level studies aimed at identifying putative causes of rapid evolutionary change. The Dianthus broteri complex, representing the largest polyploid series known...

Full description

Saved in:
Bibliographic Details
Published in:The New phytologist 2010-07, Vol.187 (2), p.542-551
Main Authors: Balao, Francisco, Valente, Luis M., Vargas, Pablo, Herrera, Javier, Talavera, Salvador
Format: Article
Language:English
Subjects:
Allopolyploidy
Amplified fragment length polymorphism
amplified fragment length polymorphism (AFLP)
Amplified Fragment Length Polymorphism Analysis
Autopolyploidy
Bayes Theorem
Biological Evolution
Caryophyllaceae
Caryophyllaceae - genetics
Chloroplast DNA
Chloroplasts
cpDNA
Deoxyribonucleic acid
Dianthus
Dianthus broteri
Diploidy
DNA
DNA sequencing
DNA, Chloroplast - genetics
DNA, Intergenic - genetics
Ecological genetics
Evolution
Evolutionary genetics
Fingerprinting
Gene flow
Genetic Variation
Genetics, Population
Genomes
Geography
Haplotypes
Haplotypes - genetics
Hexaploidy
internal transcribed spacer (ITS)
Mediterranean
Ploidies
Ploidy
Polymorphism
Polyploidy
Population genetics
Population studies
Populations
Portugal
Principal Component Analysis
Races
radiation
Spain
speciation
Stellar evolution
Tetraploidy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The micro-evolutionary mechanisms that drive large-scale radiations are not completely understood, partly because of a shortage of population-level studies aimed at identifying putative causes of rapid evolutionary change. The Dianthus broteri complex, representing the largest polyploid series known to date for any species in the genus (2x, 4x, 6x and 12x cytotypes), belongs to a lineage that was recently found to have diversified at unusually rapid rates. We used a combination of genome sequencing (internal transcribed spacer (ITS), plus chloroplast DNA (cpDNA) regions trnH-psbA, psbA-trnK and trnKmatK) and amplified fragment length polymorphism (AFLP) fingerprinting in 25 populations to infer the evolutionary history of extant polyploid races. The haplotype, ribotype and AFLP reconstructions showed a star-shaped arrangement suggesting a pattern of radiative evolution. The major, widespread haplotype occurred at all ploidy levels, whereas 20 minor haplotypes were restricted to single populations and cytotypes. In addition, AFLP analyses retrieved well-supported cytogeographic groups: six clades were clearly differentiated in terms of ploidy level and geography. Molecular data indicate that gene flow among different cytotypes is rare or nonexistent. Our study supports a scenario of rapid diversification in carnations in which autopolyploidy and allopolyploidy, in interaction with geography and/or isolation, have played prominent roles.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.2010.03280.x