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Title: Photoprotection in sequestered plastids of sea slugs and respective algal sources
Author: Cruz, Sónia
Cartaxana, Paulo
Newcomer, Rebecca
Dionísio, Gisela
Calado, Ricardo
Serôdio, João
Pelletreau, Karen N.
Rumpho, Mary E.
Issue Date: 2015
Publisher: Nature Publishing
Abstract: Some sea slugs are capable of retaining functional sequestered chloroplasts (kleptoplasts) for variable periods of time. The mechanisms supporting the maintenance of these organelles in animal hosts are still largely unknown. Non-photochemical quenching (NPQ) and the occurrence of a xanthophyll cycle were investigated in the sea slugs Elysia viridis and E. chlorotica using chlorophyll fluorescence measurements and pigment analysis. The photoprotective capacity of kleptoplasts was compared to that observed in their respective algal source, Codium tomentosum and Vaucheria litorea. A functional xanthophyll cycle and a rapidly reversible NPQ component were found in V. litorea and E. chlorotica but not in C. tomentosum and E. viridis. To our knowledge, this is the first report of the absence of a functional xanthophyll cycle in a green macroalgae. The absence of a functional xanthophyll cycle in C. tomentosum could contribute to the premature loss of photosynthetic activity and relatively short-term retention of kleptoplasts in E. viridis. On the contrary, E. chlorotica displays one of the longest functional examples of kleptoplasty known so far. We speculate that different efficiencies of photoprotection and repair mechanisms of algal food sources play a role in the longevity of photosynthetic activity in kleptoplasts retained by sea slugs.
Peer review: yes
DOI: 10.1038/srep07904
ISSN: 2045-2322
Appears in Collections:CESAM - Artigos

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