Abstract
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• Several reports on annual plants have already shown the involvement of epigenetic modifiers such as DNA methylation in their adaptation to abiotic stresses.
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• Nevertheless, the genotypic variations of epigenetic modifiers, their possible correlations with morphological traits and the impact of water deficit have not been described for perennial plants.
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• Six genotypes of Populus deltoides × P. nigra were subjected or not to a moderate water deficit treatment. Various morphological traits such as the height of the plants, their biomass and the total leaf area were measured to characterize the productivity in both conditions. Levels of DNA methylation, histone acetylation and the activities and isoform accumulation of the corresponding enzymes were measured at the shoot apex, the site of morphogenesis. Genotypic variation was observed for the morphological traits and the epigenetic variables and correlations were established among them. Genotypic variation for DNA methylation was detected in hybrid poplars. A positive correlation was demonstrated between DNA methylation percentage and productivity under well watered conditions.
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• While there was a general decrease of growth for all genotypes in response to a moderate water deficit, genotypic dependant variations of DNA methylation were found suggesting different strategies among hybrids.
Résumé
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• Plusieurs études sur des plantes annuelles ont déjà montré l’implication des modifications épigénétiques telles que la méthylation de l’ADN dans la plasticité de leurs réponses aux contraintes abiotiques.
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• Néanmoins, les variations génotypiques de ces modifications épigénétiques, leur possible corrélation avec des variables de croissance et l’impact d’un déficit hydrique n’ont pas été décrits sur une plante pérenne.
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• Six génotypes de Populus deltoïdes × P. nigra ont été soumis ou non à un déficit hydrique modéré et plusieurs variables de croissance ont été mesurées afin de caractériser leur productivité. Les niveaux de méthylation de l’ADN, d’acétylation des histones, les activités enzymatiques et l’accumulation des isoformes correspondantes ont été mesurés sur des apex caulinaires, site de la morphogenèse. Des variations génotypiques ont été observées pour les variables de croissance et épigénétiques. Une corrélation positive a été mise en évidence entre la méthylation de l’ADN et la productivité en condition hydrique favorable.
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• Bien qu’il y ait une diminution générale de la croissance de tous les génotypes en réponse à un déficit hydrique modéré, des variations génotype-dépendant de la méthylation de l’ADN ont été trouvées suggérant différentes stratégies entre hybrides.
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Gourcilleau, D., Bogeat-Triboulot, MB., Le Thiec, D. et al. DNA methylation and histone acetylation: genotypic variations in hybrid poplars, impact of water deficit and relationships with productivity. Ann. For. Sci. 67, 208 (2010). https://doi.org/10.1051/forest/2009101
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DOI: https://doi.org/10.1051/forest/2009101