Genetic diversity of the expansive grass Brachypodium pinnatum in a changing landscape: Effect of habitat age |
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Authors: | Wojciech B?ba Marzena Kurowska Agnieszka Kompa?a-B?ba Adam Wilczek Joanna D?ugosz Iwona Szarejko |
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Institution: | 1. Department of Plant Ecology, Institute of Botany, Jagiellonian University, Lubicz 46, PL-31-512 Kraków, Poland;2. Department of Genetics, University of Silesia, Jagiellońska 28, PL-40-032 Katowice, Poland;3. Department of Geobotany and Nature Protection, University of Silesia, Jagiellońska 28, PL-40-032 Katowice, Poland |
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Abstract: | Perennial grasses constitute a major group of species showing a dramatic decline of biodiversity in successional plant communities. Using AFLP markers, we examined 12 populations of the expansive grass Brachypodium pinnatum differing in habitat age (30–50, ca. 100 and >300 years old) in order to determine whether clonal diversity of populations, genetic variation, and the relative importance of clonal propagation versus sexual reproduction change with grassland age. Five AFLP primer combinations gave a total of 517 bands, 79% of which were polymorphic. 314 different multilocus lineages were distinguished among the 453 samples analyzed. The number of genotypes (G) and clonal richness (R) decreased with habitat age, while the distribution of the frequency of genets changed from many clones of similar size to dominance by one or a few large clones. We consider these results to give evidence of significant role of sexual reproduction in the early phases of colonization and prevalence of clonal growth and competitive exclusion of less adapted genotypes in the later ones. However, habitat age had only marginal effect on genetic diversity, as percentage of polymorphic loci (PPL) within all the populations analyzed was similar, viz. 38.6–43.5%. |
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Keywords: | IBD isolation by distance ISR initial seedling recruitment LDD long distance dispersal MLL multilocus lineages RSR repeated seedling recruitment |
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