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Cytogenetical variability of Ranunculus species from Iles Kerguelen

Published online by Cambridge University Press:  12 May 2004

Françoise Hennion  and
Henri Couderc
Françoise Hennion
Affiliation:
Laboratoire de Biologie Végétale, Muséum National d'Histoire Naturelle, 61 rue Buffon, 75005 Paris, France
Henri Couderc
Affiliation:
Laboratoire de Biologie Végétale, Muséum National d'Histoire Naturelle, 61 rue Buffon, 75005 Paris, France
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Abstract

New cytogenetical data are provided for the three Ranunculus species occurring on Iles Kerguelen. Chromosome morphometrical analysis (idiograms) strongly argues for a relationship between them, with some indications of a more recent origin for R. moseleyi. Aneuploidy was found within the three species for the first time. Whilst only a slight aneuploidy exists in R. pseudotrullifolius and R. moseleyi, R. biternatus shows a tendency to hyperaneuploidy. Vegetative reproduction is likely to increase the number of plants showing such chromosome number irregularities. Aneuploidy could explain some of the differences between the species in ecological tolerance and distributional area.

Keywords

CytogeneticssubantarcticaneuploidyRanunculaceae
Type
Papers—Life Sciences and Oceanography
Information
Antarctic Science , Volume 5 , Issue 1 , March 1993 , pp. 37 - 40
Copyright
© Antarctic Science Ltd 1993

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