IngentaConnect Occurrence of tetraploid and octoploid cytotypes in Senecio jacob...

Authors: HODÁLOVÁ, IVA¹; GRULICH, VÍT²; HOROVÁ, LUCIE²; VALACHOVIČ, MILAN¹; MARHOLD, KAROL

Source: Botanical Journal of the Linnean Society, Volume 153, Number 2, February 2007 , pp. 231-242(12)

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Abstract:

Four different cytotypes have been reported for Senecio jacobaea L. ssp. jacobaea throughout Europe, with the most common occurrence of tetraploids (2n = 40). Here we present a survey of previously published chromosome number data on this subspecies and its geographical distribution, and focus on populations from Pannonia and the Carpathians. Two ploidy levels have been determined in the study area, using chromosome counting and flow cytometry: tetraploid (2n = 40) and octoploid (2n = 80). Fifty-one populations originating from Slovakia, Austria, the Czech Republic, Hungary, Ukraine and Romania have been analysed. Multivariate morphometric analyses have been performed on 39 populations to study morphological differentiation between these two cytotypes. Despite slight morphological tendencies expressed on the level of populations, tetraploid and octoploids cannot be reliably distinguished morphologically and they are not taxonomically classified formally here. © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007, 153, 231-242.

Keywords: Compositae; flow cytometry; multivariate morphometrics; polyploidy; taxonomy

Document Type: Research article

DOI: 10.1111/j.1095-8339.2007.00605.x

Affiliations: 1: Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK-845 23 Bratislava, Slovak Republic 2: Department of Botany, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic

Occurrence of tetraploid and octoploid cytotypes in Senecio jacobaea ssp. jacobaea (Asteraceae) in Pannonia and the Carpathians