Naslov
Polyploid evolution and diversification in Knautia (Dipsacaceae)

Autori
Rešetnik, Ivana ; Frajman, Božo ; Ehrendorfer, Friedrich ; Schönswetter, Peter

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts – 6th Balkan Botanical Congress / Bogdanović, Sandro ; Jogan, Nejc - Zagreb, 2015, 34-35

ISBN
978-953-99774-9-6

Skup
6th Balkan Botanical Congress

Mjesto i datum
Rijeka, Hrvatska, 14.09.2015. - 18.09.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Knautia; polyploid evolution; phylogeny

Sažetak
The genus Knautia L. comprises 50–55 species with the highest species diversity in southern and southeastern Europe, especially the Alps and the Balkan Peninsula. Traditionally Knautia has always been considered taxonomically difficult due to the widespread occurrence of polyploidy and the high incidence of recurrent hybridization, which blur species boundaries. The aim of this study was to provide insights into spatiotemporal diversification of the genus by using nuclear ITS and plastid petN(ycf6)-psbM regions as well as AFLPs and flow cytometry. Our molecular data unambiguously support the monophyly of Knautia and the presence of three main lineages. The diploid annual sections Knautia and Tricheroides comprise only a few taxa ; the former is resolved at a basal position. The majority of species belong to the mostly perennial section Trichera, where polyploidisation up to the tetra- and hexaploid levels occurred within almost all traditionally recognized groups. Large-scale ploidy-level screening revealed multiple cytotypes within some taxa as well as similarity of genome sizes across different taxa belonging to the same ploidy level, with the exception of some Iberian taxa with divergent genome size. The overall shallow structure in plastid and nuclear datasets suggests a relatively young age of the diversification of section Trichera, and the occurrence of the same plastid haplotypes across large geographical distances implies recent and fast range expansion. The plastid and nuclear datasets are only partly congruent possibly due to hybridisation among different taxa, and genetic relationships reflect the geographic origin of the included populations at least to some extent. Furthermore, sequence as well as AFLP data suggest that infrageneric classification and circumscription of traditional groups are not congruent with actual evolutionary lineages and that polyploidisation was an important speciation mechanism within most species groups within section Trichera.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA