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While protective mechanisms that limit oxidative damage under excessive light are well documented in plants and algae, the photoprotective strategies employed by these photosynthetic sea slugs remain unresolved. Species within the genus <jats:italic>Elysia<\/jats:italic> are known to retain chloroplasts from various algal sources, but the extent to which the metabolic processes from the donor algae can be sustained by the sea slugs is unclear. By comparing responses to high\u2010light conditions through kinetic analyses, molecular techniques, and biochemical assays, this study shows significant differences between two photosynthetic <jats:italic>Elysia<\/jats:italic> species with chloroplasts derived from the green alga <jats:italic>Acetabularia acetabulum<\/jats:italic>. Notably, <jats:italic>Elysia timida<\/jats:italic> displayed remarkable tolerance to high\u2010light stress and sophisticated photoprotective mechanisms such as an active xanthophyll cycle, efficient D1 protein recycling, accumulation of heat\u2010shock proteins and \u03b1\u2010tocopherol. In contrast, <jats:italic>Elysia crispata<\/jats:italic> exhibited absence or limitations in these photoprotective strategies. Our findings emphasize the intricate relationship between the host animal and the stolen chloroplasts, highlighting different capacities to protect the photosynthetic organelle from oxidative damage.<\/jats:p>","DOI":"10.1111\/ppl.14273","type":"journal-article","created":{"date-parts":[[2024,4,3]],"date-time":"2024-04-03T03:29:28Z","timestamp":1712114968000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Photoprotective mechanisms in <i>Elysia<\/i> species hosting <i>Acetabularia<\/i> chloroplasts shed light on host\u2010donor compatibility in photosynthetic sea slugs"],"prefix":"10.1111","volume":"176","author":[{"given":"Luca","family":"Morelli","sequence":"first","affiliation":[{"name":"ECOMARE\u2010Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM \u2013 Centre for Environmental and Marine Studies, Department of Biology University of Aveiro  Aveiro 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