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Trees short-time and inter-annual epigenetic somatic memories in response to drought-rewatering cycles
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International audience. Climate change is characterized by increase in temperatures and decrease in precipitations impacting ecosystems in particular forests with a worldwide decline. Black poplar (P. nigra) is present in a large geographic range in Eurasia and is considered as an indicator of the dynamic of the biodiversity. Here, we used European black poplar populations (Fig. 1) to test the effects of drought in this model tree. We focused on their epigenetic response since it has been proposed that stress response is controlled by hormonal balance and chromatin process in meristematic tissues (Fig. 2). Together, these two factors regulate gene expression and the activity of transposable elements allowing plasticity and priming (ability of plants to react better during a second environmental challenge). Here, we analyzed in stressed or not poplars (greenhouse), their cambium: the meristematic tissue producing xylem and phloem vessels, We tested wherever drought-rewatering (WD-RW) cycle is followed by an epigenetic somatic memory in cambium at short time post recovery (7 days) or inter-annual memory.
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