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Molecular differentiation of commercial varieties and feral populations of oilseed rape (Brassica napus L.)

Pascher, Kathrin and Macalka, Susanne and Rau, Domenico and Gollmann, Günter and Reiner, Helmut and Glössl, Josef and Grabherr, Georg (2010) Molecular differentiation of commercial varieties and feral populations of oilseed rape (Brassica napus L.). BMC Evolutionary Biology, Vol. 10 (1), p. 63. ISSN 1471-2148. Article.

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DOI: 10.1186/1471-2148-10-63

Abstract

Background
For assessing the risk of escape of transgenes from cultivation, the persistence of feral populations of crop plants is an important aspect. Feral populations of oilseed rape, Brassica napus, are well known, but only scarce information is available on their population dynamics, particularly in Central Europe. To investigate genetic diversity, origin and persistence of feral oilseed rape in Austria, we compared variation at nine polymorphic microsatellite loci in eight feral populations with 19 commercial varieties.

Results
Overall, commercial varieties and feral populations showed a similar pattern of genetic variation and a similar level of observed heterozygosity. The two groups, however, shared less than 50% of the alleles and no multilocus genotype. A significant among-group (commercial varieties versus feral populations) component of genetic variation was observed (AMOVA: FCT = 0.132). Pairwise comparisons between varieties and feral populations showed moderate to very high genetic differentiation (FST = 0.209 - 0.900). The software STRUCTURE also demonstrated a clear separation between commercial varieties and feral samples: out of 17 identified genetic clusters, only one comprised plants from both a commercial variety and feral sites.

Conclusions
The results suggest that feral oilseed rape is able to maintain persistent populations. The feral populations may have derived from older cultivars that were not included in our analyses or perhaps have already hybridised with related crops or wild relatives. Feral populations therefore have to be considered in ecological risk assessment and future coexistence measures as a potential hybridisation partner of transgenic oilseed rape.

Item Type:Article
ID Code:3985
Status:Published
Refereed:Yes
Uncontrolled Keywords:Brassica napus, transgenic oilseed rape
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/07 Genetica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze agronomiche e genetica vegetale agraria
Publisher:BioMed Central
ISSN:1471-2148
Copyright Holders:© 2010 Pascher et al;
Deposited On:28 May 2010 10:06

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