Analysis of Genetic Diversity in the Brassica napus L. Gene Pool Using SSR Markers
- 1.2k Downloads
Genetic diversity throughout the rapeseed (Brassica napus ssp. napus) primary gene pool was examined by obtaining detailed molecular genetic information at simple sequence repeat (SSR) loci for a broad range of winter and spring oilseed, fodder and leaf rape gene bank accessions. The plant material investigated was selected from a preliminary B. napus core collection developed from European gene bank material, and was intended to cover as broadly as possible the diversity present in the species, excluding swedes (B. napus ssp. napobrassica (L.) Hanelt). A set of 96 genotypes was characterised using publicly available mapped SSR markers spread over the B. napus genome. Allelic information from 30 SSR primer combinations amplifying 220 alleles at 51 polymorphic loci provided unique genetic fingerprints for all genotypes. UPGMA clustering enabled identification of four general groups with increasing genetic diversity as follows (1) spring oilseed and fodder; (2) winter oilseed; (3) winter fodder; (4) vegetable genotypes. The most extreme allelic variation was observed in a spring kale from the United Kingdom and a Japanese spring vegetable genotype, and two winter rape accessions from Korea and Japan, respectively. Unexpectedly the next most distinct genotypes were two old winter oilseed varieties from Germany and Ukraine, respectively. A number of other accessions were also found to be genetically distinct from the other material of the same type. The molecular genetic information gained enables the identification of untapped genetic variability for rapeseed breeding and is potentially interesting with respect to increasing heterosis in oilseed rape hybrids.
KeywordsBrassica napus Genetic diversity Microsatellites Rapeseed SSR markers
Unable to display preview. Download preview PDF.
- Diederichsen, A. 2001BrassicaHanelt, P. eds. Mansfeld's Encyclopedia of Agricultural and Horticultural Crops 3SpringerHeidelberg14351465Google Scholar
- Doyle, J.J., Doyle, J.L. 1990Isolation of plant DNA from fresh tissueFocus121315Google Scholar
- Kimber, D.S., McGregor, D.I. 1995The species and their origin, cultivation and world productionKimber, D.McGregor, D.I. eds. Brassica Oilseeds: Production and UtilizationCABI PublishingWallingford, UK19Google Scholar
- Lühs, W., Seyis, F., Frauen, M., Busch, H., Frese, L., Willner, E., Friedt, W., Gustafsson, M., Poulsen, G. 2003aDevelopment and evaluation of a Brassica napus core collectionKnüpffer, H.Ochsmann, J. eds. Rudolf Mansfeld and Plant Genetic ResourcesZADI/IBVBonn284289Proceedings of a symposium dedicated to the 100th birthday of Rudolf MansfeldGatersleben, Germany, 8–9 October 2001. Schriften zu Genetischen Ressourcen 19. (http://www.genres.de/infos/rei-bd22.htm).Google Scholar
- Lühs W., Seyis F., Frauen M., Ulber B., Stemann G., Busch H., Friedt W., Gustafsson M. and Poulsen G. 2003b. Evaluation of a Brassica napus core collection and prospects of its exploitation through rapeseed breeding. 11th International Rapeseed Congress 6–10 July 2003, Vol. 2. Copenhagen, Denmark, pp. 371–374.Google Scholar
- Nishi, S. 1980Differentiation of Brassica crops in Asia and the breeding of ‘Hakuran’, a newly synthesized leafy vegetableTsunoda, S.Hinata, K.Gómez-Campo, C. eds. Brassica Crops and Wild Allies, Biology and BreedingJapan Scientific Societies PressTokyo133150Google Scholar
- O’Neill, R., Snowdon, R.J., Köhler, W. 2003Population genetics aspects of biodiversityProg. Bot.64115137Google Scholar
- Poulsen G., Busch H., Frauen M., Frese L., Friedt W., Gustafsson M., Ottosson F., Seyis F., Stemann G., Ulber B., Willner E. and Lühs W. 2005. The European Brassica napus core collection – Characterisation, evaluation and establishment. Cruciferae Newslett. (in press).Google Scholar