Plant Systematics and Evolution

, Volume 184, Issue 3–4, pp 195–206 | Cite as

The allopolyploid origin ofSedum rupestre subsp.rupestre (Crassulaceae)

  • H. 't Hart
  • J. M. Sandbrink
  • I. Csikos
  • A. van Ooyen
  • J. van Brederode


InSedum rupestre L. a polyploid series (x = 16) occurs in which aneuploid chromosome numbers and odd levels of ploidy prevail. The most common and widely distributed cytotype,S. rupestre subsp.rupestre, is 2n = 112. Plants resemblingS. rupestre subsp.rupestre can be obtained by hybridizing the tetraploid cytotypes ofS. forsterianumSm. (2n = 48) andS. rupestre subsp.erectum't Hart (2n = 64). Comparison of these artificial hybrids with their parents and a large number of plants ofS. rupestre subsp.rupestre (2n = 112) from nature showed thatS. rupestre subsp.rupestre and the artificial hybrids are morphologically indistinguishable, and intermediate betweenS. forsterianum andS. rupestre subsp.erectum. MorphologicallyS. rupestre subsp.rupestre is closer to subsp.erectum than toS. forsterianum. Chloroplast DNA restriction patterns ofS. rupestre subsp.rupestre, however, resembleS. forsterianum more closely. The combined results of the hybridization experiments, the analysis of the cpDNA restriction patterns, and the morphological variation indicate the allopolyploid origin ofS. rupestre subsp.rupestre.

Key words

Crassulaceae Sedum rupestre Chromosome numbers hybridization allopolyploidy chloroplast DNA RFLP evolution 


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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • H. 't Hart
    • 1
  • J. M. Sandbrink
    • 1
  • I. Csikos
    • 1
  • A. van Ooyen
    • 2
  • J. van Brederode
    • 1
  1. 1.Department of Plant Ecology and Evolutionary BiologyUniversity of UtrechtUtrechtThe Netherlands
  2. 2.Department of BioinformaticaUniversity of UtrechtUtrechtThe Netherlands

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