Rapid establishment of species barriers in plants compared to animals

Monnet, François; Postel, Zoé; Touzet, Pascal; Fraïsse, Christelle; Van de Peer, Yves; Vekemans, Xavier; Roux, Camille

doi:10.1101/2023.10.16.562535

Cited by 4 publications

(2 citation statements)

References 84 publications

(87 reference statements)

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“…In particular, it will be exciting to determine how different groups of organisms accumulate such incompatibilities, especially since the "speciation clock" has been suggested to tick at different paces across the tree of life (e.g. in plants vs animals, Monnet et al, 2023). In addition, here we focused on the male germline, but the comparison with the female germline would be necessary to provide a comprehensive picture.…”

Section: Discussionmentioning

confidence: 99%

Diverging Arabidopsis populations quickly accumulate pollen-acting genetic incompatibilities

Condon,

Carpentier,

Tabourin

et al. 2024

Preprint

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The process by which species diverge from one another, gradually accumulate genetic incompatibilities and eventually reach full-fledged reproductive isolation is a key question in evolutionary biology. However, the nature of reproductive barriers, the pace at which they accumulate and their genomic distribution remain poorly documented. The disruption of co-adapted epistatic interactions in hybrids and the accumulation of selfish genetic elements are proposed contributors to this process, and can lead to the distortion of the mendelian segregation of the affected loci across the genome. In this study we detect and quantify segregation distortion across the genomes of crosses produced from a diverse sampling of Arabidopsis lyrata and A. halleri populations, two species at the early stages of speciation and that can still interbreed. We show that both the frequency of occurrence and the magnitude of distortion loci increase as the parents' genetic distance from one another increases. We also observe that distorter loci evolve rapidly, as they occur not only within interspecific hybrids, but also in intraspecific hybrids produced from isolated population crosses. Finally, we identify both genome-wide non-independence and two specific genomic regions on different chromosomes where opposite distortion effects are repeatedly observed across multiple F1 individuals, suggesting negative epistasis is a major contributor to the evolution of hybrid segregation distortion. Our study demonstrates that pollen-acting segregation distortion is ubiquitous, and contributes not only to the ongoing reproductive isolation between A. halleri and A. lyrata, but also between very recently diverged populations of the same species.

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Section: Discussionmentioning

confidence: 99%

Diverging Arabidopsis populations quickly accumulate pollen-acting genetic incompatibilities

Condon,

Carpentier,

Tabourin

et al. 2024

Preprint

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“…The DILS pipeline allows the analysis of two species scenarios only: we therefore performed separate analyses for the three two-species comparisons, with the "all-CS", "all-CV", and "all-SV" pairwise datasets. We first tested the priors proposed by Monnet et al (2023) according to observed statistics of polymorphism and divergence: we then increased the range of priors to get better results on the goodness-of-fit tests. We used the same priors for all analyses, with different numbers of sequences per gene and per sample according to the dataset (Table S4).…”

Section: Scenarios Of Speciationmentioning

confidence: 99%

Symbiotic status does not preclude hybridisation in Mediterranean octocorals

Aurelle,

Haguenauer,

Bally

et al. 2024

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Understanding how species can form and remain isolated in the marine environment is still an active research area. Correctly delimiting species if also of interest for biodiversity conservation and for a wide range of biological studies. Here we study the differentiation and the possibility of hybridization among three temperate octocorals : Eunicella cavolini, E. singularis and E. verrucosa. These species can occur in sympatry and morphologically intermediate individuals have been observed. Among these three species, E. singularis is the only one known to show a mutualistic symbiosis with photosynthetic Symbiodiniaceae. As symbiotic relationships can be involved in species barriers, we tested here the possibility of hybridization between symbiotic and non-symbiotic Eunicella species. Through multivariate analyses and hybrid detection, we prove the existence of current gene flow between E. singularis and E. cavolini, with the observation of F1 and F2 hybrids and backcrosses. Demographic inferences indicate a scenario of secondary contact between these two species. Our data suggest an intermediate abundance of Symbiodiniaceae in the hybrids of the two species. We discuss the evolution of the Symbiodiniaceae / cnidarian symbiosis in the light of our results.

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Rapid establishment of species barriers in plants compared to animals

Monnet,

Postel,

Touzet

et al. 2023

Preprint

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Speciation, the process by which new reproductively isolated species arise from ancestral populations, occurs because of genetic changes that accumulate over time. To date, the notion that interspecific genetic exchange occurs more frequently between plant species than animals species has gained a strong footing in the scientific discourse, albeit primarily relying on verbal arguments centered on mating behavior. By examining the dynamics of gene flow across a continuum of divergence in both kingdoms, we observe the opposite relationship: plants experience less introgression than animals at the same level of genetic divergence, suggesting that species barriers are established more rapidly in plants. This pattern questions the differences in microevolutionary processes between plants and animals that impact genetic exchange at the macroevolutionary scale.

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Rapid establishment of species barriers in plants compared to animals

Cited by 4 publications

References 84 publications

Diverging Arabidopsis populations quickly accumulate pollen-acting genetic incompatibilities

Diverging Arabidopsis populations quickly accumulate pollen-acting genetic incompatibilities

Symbiotic status does not preclude hybridisation in Mediterranean octocorals

Rapid establishment of species barriers in plants compared to animals

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