Fitness consequences of hybridization in a predominantly selfing species: insights into the role of dominance and epistatic incompatibilities
| Autor: | Josselin Clo, Joëlle Ronfort, Laurène Gay |
|---|---|
| Přispěvatelé: | Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Charles University [Prague] (CU), ANR-13-ADAP-0011,SEAD,Comment l'autofécondation affecte-t-elle l'adaptation : Conséquences génétiques et démographiques(2013) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Genotype Heterosis Outbreeding depression Biology 010603 evolutionary biology 01 natural sciences Article 03 medical and health sciences Inbred strain Genetics Hybrid Vigor Genetics (clinical) Crosses Genetic 030304 developmental biology Dominance (genetics) 0303 health sciences Genetic Drift Selfing Epistasis Genetic Reproductive isolation biology.organism_classification Medicago truncatula Evolutionary biology [SDE]Environmental Sciences Epistasis Hybridization Genetic |
| Zdroj: | Heredity Heredity, Nature Publishing Group, 2021, ⟨10.1038/s41437-021-00465-2⟩ Heredity (Edinb) |
| ISSN: | 0018-067X |
| DOI: | 10.1038/s41437-021-00465-2⟩ |
| Popis: | International audience; Studying the consequences of hybridization on plant performance is insightful to understand the adaptive potential of populations, notably at local scales. Due to reduced effective recombination, predominantly selfing species are organized in highly homozygous multi-locus-genotypes (or lines) that accumulate genetic differentiation both among- and within-populations. This high level of homozygosity facilitates the dissection of the genetic basis of hybrid performance in highly selfing species, which gives insights into the mechanisms of reproductive isolation between lines. Here, we explored the fitness consequences of hybridization events between natural inbred lines of the predominantly selfing species Medicago truncatula, at both within- and among-populations scales. We found that hybridization has opposite effects pending on studied fitness proxies, with dry mass showing heterosis, and seed production showing outbreeding depression. Although we found significant patterns of heterosis and outbreeding depression, they did not differ significantly for within- compared to among-population crosses. Family-based analyses allowed us to determine that hybrid differentiation was mostly due to dominance and epistasis. Dominance and/or dominant epistatic interactions increased dry mass, while decreasing seed production, and recessive epistatic interactions mostly had a positive effect on both fitness proxies. Our results illustrate how genetic incompatibilities can accumulate at a very local scale among multi-locus-genotypes, and how non-additive genetic effects contribute to heterosis and outbreeding depression. |
| Databáze: | OpenAIRE |
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