Naslov
Genome size and chromosome numbers in the genus Sesleria Scop. (Poaceae)

Autori
Lazarević, Maja ; Alegro, Antun ; Lakušić, Dmitar ; Kuzmanović, Nevena ; Frajman, Božo ; Schoenswetter, Peter

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

Izvornik
International Symposium on „Evolution of Balkan Biodiversity“ - Book of Abstracts / Rešetnik, Ivana ; Bogdanović, Sandro ; Alegro, Antun - Zagreb : Hrvatsko Botaničko Društvo, 2012, 19-19

ISBN
978-953-99774-5-8

Skup
International Symposium on „Evolution of Balkan Biodiversity“

Mjesto i datum
Zagreb, Hrvatska, 28.06.2012. - 30.06.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polyploidy levels; flow citometry; Alps; Balkans

Sažetak
Polyploidy is considered as a major force in plat evolution and diversification, which may foster adaptation to new ecological niches and often confers reproductive isolation, ultimately leading to speciation. Our aim was to explore ploidy levels of different section and subsections of the genus Sesleria using flow cytometry and standard karyological techniques. The genus Sesleria Scop. (Paceae) comprises around 30 species distributed mainly in Europe with extensions in West Asia and North Africa. A few diploid species (2n=2x=14) are known from the Alps, leading to the suggestion that this region is a primary centre of this genus’ development. On the other hand, the Balkan Peninsula with its tetra- to dodecaploid taxa (2n=4x=28, 2n=8x=56, 2n=2x=84) is a centre of diversity and secondary evolution of the genus. About 80% of the known Sesleria species inhabit this region, half of which are endemic. In order to investigate as many populations as possible, we used silica-dried as well as fresh plant material and compared these results with chromosome numbers. Around 440 populations collected throughout Europe were analysed. Results confirmed the diploid status of the Alpine sections Psilathera and Sesleriella and also of closely related genus Oreochloa. Different ploidy levels are present in sections Argentae and Calcariae. There is a strong correlation between ploidy levels and genome size. Decreasing Cx value with increasing ploidy level suggests substantial genome downsizing after polyploidization.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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