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Comparative Epigenetic and Genetic Spatial Structure in Mediterranean Mountain Plants: a Multispecies Study

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Specialty Genetics
Date 2024 Jan 17
PMID 38233486
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Abstract

Changes in epigenetic states can allow individuals to cope with environmental changes. If such changes are heritable, this may lead to epigenetic adaptation. Thus, it is likely that in sessile organisms such as plants, part of the spatial epigenetic variation found across individuals will reflect the environmental heterogeneity within populations. The departure of the spatial epigenetic structure from the baseline genetic variation can help in understanding the value of epigenetic regulation in species with different breadth of optimal environmental requirements. Here, we hypothesise that in plants with narrow environmental requirements, epigenetic variability should be less structured in space given the lower variability in suitable environmental conditions. We performed a multispecies study that considered seven pairs of congeneric plant species, each encompassing a narrow endemic with habitat specialisation and a widespread species. In three populations per species we used AFLP and methylation-sensitive AFLP markers to characterise the spatial genetic and epigenetic structures. Narrow endemics showed a significantly lower epigenetic than genetic differentiation between populations. Within populations, epigenetic variation was less spatially structured than genetic variation, mainly in narrow endemics. In these species, structural equation models revealed that such pattern was associated to a lack of correlation between epigenetic and genetic information. Altogether, these results show a greater decoupling of the spatial epigenetic variation from the baseline spatial genetic pattern in endemic species. These findings highlight the value of studying genetic and epigenetic spatial variation to better understand habitat specialisation in plants.

References
1.
Balao F, Paun O, Alonso C . Uncovering the contribution of epigenetics to plant phenotypic variation in Mediterranean ecosystems. Plant Biol (Stuttg). 2017; 20 Suppl 1:38-49. DOI: 10.1111/plb.12594. View

2.
Castilla A, Alonso C, Herrera C . Genetic structure of the shrub Daphne laureola across the Baetic Ranges, a Mediterranean glacial refugium and biodiversity hotspot. Plant Biol (Stuttg). 2011; 14(3):515-24. DOI: 10.1111/j.1438-8677.2011.00521.x. View

3.
Cavers S, Degen B, Caron H, Lemes M, Margis R, Salgueiro F . Optimal sampling strategy for estimation of spatial genetic structure in tree populations. Heredity (Edinb). 2005; 95(4):281-9. DOI: 10.1038/sj.hdy.6800709. View

4.
Chybicki I, Oleksa A, Burczyk J . Increased inbreeding and strong kinship structure in Taxus baccata estimated from both AFLP and SSR data. Heredity (Edinb). 2011; 107(6):589-600. PMC: 3242636. DOI: 10.1038/hdy.2011.51. View

5.
De-Lucas A, Gonzalez-Martinez S, Vendramin G, Hidalgo E, Heuertz M . Spatial genetic structure in continuous and fragmented populations of Pinus pinaster Aiton. Mol Ecol. 2009; 18(22):4564-76. DOI: 10.1111/j.1365-294X.2009.04372.x. View