Cytotaxonomical study of Draba incana L. from Iceland

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
External organisations
  • University of Iceland
  • Icelandic Institute of Natural History
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Botany

Keywords

  • Brassicaceae, chromosome, polyploid
Original languageEnglish
Pages (from-to)11-22
JournalActa Botanica Islandica
Volume15
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes