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Cytotaxonomical study of Draba incana L. from Iceland

  • Groa Valgerdur Ingimundardottir
  • Hörður Kristinsson
  • Kesara Anamthawat-Jónsson
Publiceringsår: 2011
Språk: Engelska
Sidor: 11-22
Publikation/Tidskrift/Serie: Acta Botanica Islandica
Volym: 15
Dokumenttyp: Artikel i tidskrift
Förlag: Iceland Institute of Natural History

Abstract english

Draba incana L. (Brassicaceae) is an arctic-alpine species which is both common and widely distributed in Iceland. Voucher specimens of D. incana in the ICEL and AMNH herbaria were examined and no major changes in the taxonomic identification or the species distribution map were made. Living plants were collected in this study: nine from Eyjafjördur and Lake Mývatn, northern Iceland, and one from Vatnsendi, southern Iceland. The plants were maintained indoors in the winter and outdoors in the summer. A new morphological feature was discovered in this study – a creeping growth habit forming offshoots, not reported in any major floras examined. This habit was observed in plants on Hrútey Island in Lake Mývatn, and was also detected in one voucher specimen from a different location. The creeping habit was confirmed in the transplanted samples grown indoors. Both groups of plants, i.e. those having normal growth form with erect inflorescences and plants showing creeping growth habit, were used in cytotaxonomical investigation. Chromosomes were prepared from shoot tips and whole seedlings combined, using protoplast dropping method. Both plant groups showed a stable tetraploid chromosome number 2n = 4x = 32. The study not only confirms that D. incana in Iceland is a tetraploid species, but also shows stable chromosome number in morphologically variable material. Cytotaxonomical aspects of Draba are discussed.


  • Botany
  • Brassicaceae
  • chromosome
  • polyploid


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