Listl, Daniela and Reisch, Christoph (2014) Genetic variation of Sherardia arvensis L. - How land use and fragmentation affect an arable weed. BIOCHEMICAL SYSTEMATICS AND ECOLOGY, 55. pp. 164-169. ISSN 0305-1978, 1873-2925
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The distribution of arable weeds extends over regions, where the species occur naturally in different kinds of habitats and regions, where they are mainly limited to arable fields. Here, we present a comparative study on the genetic struchire of the arable weed Sherardia arvensis L comprising populations from Mediterranean grasslands in Southern France and populations from arable fields in Germany. Enhanced by intensified land use since the 1960th, overall population density in Germany is very low compared to the density of populations in Southern France. We tested whether genetic variation within and among populations differ between France and Germany due to different patterns of distribution and land use. Therefore, we analysed 231 individuals of S. arvensis from 24 populations using AFLPs. Based on fragment analysis data we compared spatial genetic structure and genetic variation of populations from the two regions. Genetic variation within populations from the two regions (Shannon Index = 0.13 for both) and genetic variation among populations (26.8% and 30.0% in an analysis of molecular variance) were comparable. In both regions a drift-migration model supported the assumption of gene flow between populations. However, a clear correlation of geographical and genetic distances could only be reported for the indigenous populations from France (r = 0.46; P = 0.02), whereas in Germany a spatial genetic relationship between populations was missing (r = 0.16; P = 0.21). Our study revealed that neither French nor German populations are genetically impoverished. For French populations further the spatial genetic structure suggests that there is current gene flow between populations through pollinators and seed dispersal by cattle. For German populations comparable levels of genetic diversity and gene flow were detected, but gene flow was random. This can be traced back in all likelihood to diffuse dispersal by agriculture and the mechanical reshuffling of the individuals from the soil seed bank. (C) 2014 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | POPULATION-STRUCTURE; SEED BANK; DIVERSITY; LANDSCAPE; SAXIFRAGACEAE; CONSERVATION; BRASSICACEAE; DIVERGENCE; HABITATS; HISTORY; AFLP; Agricultural fields; Germany; Southern France; Population genetics; Sherardia arvensis |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Sep 2019 12:12 |
| Last Modified: | 04 Sep 2019 12:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9811 |
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