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Processes affecting genetic structure and conservation: a case study of wild and cultivated Brassica rapa

Author:
  • Naja Steen Andersen
  • Gert Poulsen
  • Bente Anni Andersen
  • Lars Podenphant Kiaer
  • Tina D'Hertefeldt
  • Mike J. Wilkinson
  • Rikke Bagger Jorgensen
Publishing year: 2009
Language: English
Pages: 189-200
Publication/Series: Genetic Resources and Crop Evolution
Volume: 56
Issue: 2
Document type: Journal article
Publisher: Springer

Abstract english

When planning optimal conservation strategies for wild and cultivated types of a plant species, a number of influencing biological and environmental factors should be considered from the outset. In the present study Brassica rapa was used to illustrate this: to develop Scandinavian conservation strategies for wild and cultivated B. rapa, DNA-marker analysis was performed on 15 cultivated and 17 wild accessions of B. rapa plus 8 accessions of the cross compatible B. napus. The B. rapa cultivars were bred in Sweden and Finland in 1944-1997 and the wild B. rapa material was collected from Denmark, Sweden and United Kingdom. The B. napus accessions were bred within the last 20 years in the Scandinavian countries. Results were based on scoring of 131 polymorphic ISSR markers in the total plant material. A Bayesian Markov chain Monte Carlo (MCMC) approach implemented in NewHybrids demonstrated a clear distinction of B. rapa and B. napus individuals except for three individuals that seemed to be backcrosses. The backcrossed hybrids descended from two Swedish populations, one wild and one escaped. The overall pattern of genetic variation and structure in B. rapa showed that cultivated and wild B. rapa accessions formed two almost separated clusters. Geographical origin and breeding history of cultivars were reflected in these genetic relationships. In addition, wild populations from Denmark and Sweden seemed to be closely related, except for a Swedish population, which seemingly was an escaped cultivar. The study point to that many processes, e.g. spontaneous introgression, naturalisation, breeding and agricultural practise affected the genetic structure of wild and cultivated B. rapa populations.

Keywords

  • Ecology
  • Crop-weed complex
  • Conservation
  • Brassica napus
  • Brassica rapa
  • Genetic
  • differentiation
  • ISSR

Other

Published
  • Soil Ecology
  • ISSN: 0925-9864
Tina D'Hertefeldt
E-mail: tina [dot] dhertefeldt [at] biol [dot] lu [dot] se

Researcher

Biodiversity

+46 46 222 37 75

+46 73 659 22 86

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Web editor

Oikos Editorial Office

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Research group

Soil Ecology Group

Projects

  • The effects of perennial biofuel crops (Salix, Phalaris, Populus) on soil ecosystem services
  • Weed-soil interactions in response to land management intensity
  • The effect of Brassica napus - Brassica rapa gene flow on volunteer persistence
  • SoilService

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