Migration without interbreeding: Evolutionary history of a highly selfing Mediterranean grass inferred from whole genomes
| Autor: | Michele Wyler, Anne C. Roulin, Luis A. J. Mur, Aleksandra Skalska, Robert Hasterok, Nicola Pecchioni, Christoph Stritt, Elena L. Gimmi, Abdelmonaim H. Bakali |
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| Přispěvatelé: | University of Zurich, Roulin, Anne C |
| Rok vydání: | 2021 |
| Předmět: |
Sympatry
Evolution Seed dispersal Population Population genetics 580 Plants (Botany) Coalescent theory UFSP13-7 Evolution in Action: From Genomes to Ecosystems 10126 Department of Plant and Microbial Biology 1311 Genetics Behavior and Systematics selfing Genetics heterozygosity 10211 Zurich-Basel Plant Science Center education Ecology Evolution Behavior and Systematics Plant evolution education.field_of_study Panmixia Genome Ecology biology food and beverages Microevolution Selfing Genetic Variation population structure flowering time Plant biology.organism_classification seed dispersal 1105 Ecology Evolution Behavior and Systematics Genetics Population Evolutionary biology Genome Plant Microsatellite Repeats Brachypodium Genetic structure Biological dispersal Brachypodium distachyon |
| Zdroj: | Molecular ecology. 31(1) |
| ISSN: | 1365-294X |
| Popis: | Wild plant populations show extensive genetic subdivision and are far from the ideal of panmixia which permeates population genetic theory. Understanding the spatial and temporal scale of population structure is therefore fundamental for empirical population genetics – and of interest in itself, as it yields insights into the history and biology of a species. In this study we extend the genomic resources for the wild Mediterranean grass Brachypodium distachyon to investigate the scale of population structure and its underlying history at whole-genome resolution. 86 accessions were sampled at local and regional scales in Italy and France, which closes a conspicuous gap in the collection for this model organism. The analysis of 196 accessions, spanning the Mediterranean from Spain to Iraq, suggests that the interplay of high selfing and seed dispersal rates has shaped genetic structure in B. distachyon. At the continental scale, the evolution in B. distachyon is characterized by the independent expansion of three lineages during the Upper Pleistocene. Today, these lineages may occur on the same meadow yet do not interbreed. At the regional scale, dispersal and selfing interact and maintain high genotypic diversity, thus challenging the textbook notion that selfing in finite populations implies reduced diversity. Our study extends the population genomic resources for B. distachyon and suggests that an important use of this wild plant model is to investigate how selfing and dispersal, two processes typically studied separately, interact in colonizing plant species. |
| Databáze: | OpenAIRE |
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