Local environment modulates whole-transcriptome expression in the seagrass Posidonia oceanica under warming and nutrients excess. (15th June 2022)

• Record Type: Journal Article
• Authors: Pazzaglia, Jessica; Santillán-Sarmiento, Alex; Ruocco, Miriam; Dattolo, Emanuela; Ambrosino, Luca; Marín-Guirao, Lazaro; Procaccini, Gabriele
• Is Part Of: Environmental pollution. Volume 303(2022)
• Publication Date: 2022-06-15
• Subjects: Seagrasses -- Multiple stressors -- Global warming -- Eutrophication -- Gene expression -- Epigenetics; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.119077
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The intensification of anomalous events of seawater warming and the co-occurrence with local anthropogenic stressors are threatening coastal marine habitats, including seagrasses, which form extensive underwater meadows. Eutrophication highly affects coastal environments, potentially summing up to the widespread effects of global climate changes. In the present study, we investigated for the first time in seagrasses, the transcriptional response of different plant organs (i.e., leaf and shoot apical meristem, SAM) of the Mediterranean seagrass Posidonia oceanica growing in environments with a different history of nutrient enrichment. To this end, a mesocosm experiment exposing plants to single (nutrient enrichment or temperature increase) and multiple stressors (nutrient enrichment plus temperature increase), was performed. Results revealed a differential transcriptome regulation of plants under single and multiple stressors, showing an organ-specific sensitivity depending on plants' origin. While leaf tissues were more responsive to nutrient stress, SAM revealed a higher sensitivity to temperature treatments, especially in plants already impacted in their native environment. The exposure to stress conditions induced the modulation of different biological processes. Plants living in an oligotrophic environment were more responsive to nutrients compared to plants from a eutrophic environment. Evidences that epigenetic mechanisms were involved in the regulation of transcriptional reprogramming were also observed in both plants' organs. These results represent a further step in the comprehension of seagrass response to abiotic stressors pointing out the importance of local pressures in a global warming scenario. Graphical abstract: Image 1 Highlights: Local pressure influence plants' transcriptional responses to stress. Plants in eutrophic sites will be more impacted by seawater temperature increase. Organ-specific vulnerability to single and multiple stresses. Potential epigenetic regulation of transcriptional responses to stress.