Plant Systematics and Evolution

, Volume 241, Issue 3–4, pp 171–184

Karyotype evolution in South American species of Hypochaeris (Asteraceae, Lactuceae)

  • H. Weiss-Schneeweiss
  • T. F. Stuessy
  • S. Siljak-Yakovlev
  • C. M. Baeza
  • J. Parker
Article

DOI: 10.1007/s00606-003-0026-x

Cite this article as:
Weiss-Schneeweiss, H., Stuessy, T., Siljak-Yakovlev, S. et al. Plant Syst. Evol. (2003) 241: 171. doi:10.1007/s00606-003-0026-x

Abstract.

The genus Hypochaeris (Asteraceae, Lactuceae) contains ten species in Europe, three in Asia, and approximately 50 in South America. Previous cytotaxonomic studies have shown two groups of taxa: (1) European species with different basic chromosome numbers and differentiated karyotypes, and (2) South American species with x=4 and uniform asymmetric and bimodal karyotypes. Karyotypic data are synthesized for South American species of Hypochaeris with new information for six Chilean species: H. acaulis, H. apargioides, H. palustris, H. spathulata, H.tenuifolia and H. thrincioides. Four main groups can be distinguished based on presence and localization of secondary constrictions – SCs (bearing Nucleolar Organizer Regions – NORs) on chromosomes 2 and 3, and 18S–25S and 5S rDNA loci number, localization, and activity. We propose karyotypic evolution of South American Hypochaeris (x=4) from H. maculata-like (x=5) European ancestors. The original South American karyotype would have possessed two SCs, one on the long arm of chromosome 2, and the other on the short arm of chromosome 3 (in terminal position). Further evolution would have involved inversion within the short arm of chromosome 3 and inactivation/loss of the SC on chromosome 2.

Keywords

FISH Hypochaeris karyotype evolution rRNA genes South America 

Copyright information

© Springer-Verlag Wien 2003

Authors and Affiliations

  • H. Weiss-Schneeweiss
    • 1
  • T. F. Stuessy
    • 1
  • S. Siljak-Yakovlev
    • 2
  • C. M. Baeza
    • 3
  • J. Parker
    • 4
  1. 1.Department of Higher Plant Systematics and Evolution, Institute of BotanyUniversity of ViennaViennaAustria
  2. 2.Département Evolution & Systématique, UPRESA CNRS 8079Université de Paris-SudOrsay CedexFrance
  3. 3.Departamento de BotánicaUniversidad de ConcepciónConcepciónChile
  4. 4.Botanic Garden CambridgeUniversity CambridgeUK

Personalised recommendations