Towards resolving the Knautia arvensis agg. (Dipsacaceae) puzzle: primary and secondary contact zones and ploidy segregation at landscape and microgeographic scales

0326704 - BÚ 2010 RIV GB eng J - Journal Article
Kolář, F. - Štech, M. - Trávníček, Pavel - Rauchová, Jana - Urfus, Tomáš - Vít, Petr - Kubešová, Magdalena - Suda, Jan
Towards resolving the Knautia arvensis agg. (Dipsacaceae) puzzle: primary and secondary contact zones and ploidy segregation at landscape and microgeographic scales.
[Knautia arvensis agg. (Dipsacaceae): primární a sekundární zóny kontaktu ploidních cytotypů a jejich segregace na krajinné i mikrogeografické úrovni.]
Annals of Botany. Roč. 103, č. 6 (2009), s. 963-974. ISSN 0305-7364. E-ISSN 1095-8290
R&D Projects: GA AV ČR(CZ) KJB601110627
Institutional research plan: CEZ:AV0Z60050516
Keywords : Knautia arvensis * polyploidy * ploidy mixture
Subject RIV: EF - Botanics
Impact factor: 3.501, year: 2009

n the present study, it has been demonstrated that Knautia arvensis is an intriguing taxon that shows variation in both genome copy number and monoploid genome size. Diploid and tetraploid cytotypes exhibit spatial segregation at all the geographical scales examined, including the Central European portion of the distribution range, the zone of ploidy overlap, the mixed-ploidy populations, and the selected mixed-ploidy plots within such populations. Distributional and phenotypic data support the existence of both primary and sec- ondary zones of cytotype contact. Irrespective of taxonomic affinity, ploidy level seems to be the major determinant of the strength of interploidy reproductive isolation. In addition, our study also highlights the importance of involving different ontogenetic stages when assessing evolutionary processes in mixed-ploidy populations.

Knautia arvensis představuje taxon s variabilitou ploidní úrovně i absolutní velikosti monoploidního genomu. Druh tvoří dva cytotypy - diploiní a tetraploidní, přičemž oba cytotypy vykazují prostorovou segregaci na různých geografických škálách. V zóně kontaktu obou cytotypů tvoří smíšené populace a kontakt obou cytotypů je primární i sekundární povahy, jak ukazují fehologická data a typ rozšíření obou cytotypů. Mezi ploidními cytotypy existuje reprodukční bariéra.
Permanent Link: http://hdl.handle.net/11104/0173722