Přirozená epigenetická variabilita: hnací síla adaptace populací planě rostoucích rostlin?

Sammarco, Iris

A growing body of literature suggests that epigenetic variation might contribute to local adaptation of natural plant populations. Epigenetic mechanisms, such as DNA methylation, can in fact quickly alter phenotypes in response to environmental changes. Furthermore, these changes can be inherited across several generations (especially clonal), suggesting that DNA methylation may enable heritable phenotypic variation and eventually contribute to adaptation. However, it is still unclear whether epigenetic mechanisms can have an adaptive potential in plants, or in other words, whether they present variation among natural populations, are inherited across generations and have fitness effects. During my PhD project, together with my co-authors, I tested these conditions on several natural populations of two non-model clonal plant species, the wild strawberry (Fragaria vesca) and the black poplar (Populus nigra). To do so, I used the current gold standard for DNA methylation analysis (Whole Genome Bisulfite Sequencing), which allowed me to characterize the genome-wide DNA methylation level of individual plants at the single base-resolution. For both species, I found extensive DNA methylation diversity among populations, which was partially affected by the natural climatic conditions of the populations...

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