Inorganic carbon concentrating mechanisms in free-living and symbiotic dinoflagellates and chromerids

0537038 - MBÚ 2021 RIV US eng J - Journal Article
Raven, J. A. - Suggett, D.J. - Giordano, Mario
Inorganic carbon concentrating mechanisms in free-living and symbiotic dinoflagellates and chromerids.
Journal of Phycology. Roč. 56, č. 6 (2020), s. 1377-1397. ISSN 0022-3646. E-ISSN 1529-8817
R&D Projects: GA ČR(CZ) GA17-18917S
Institutional support: RVO:61388971
Keywords : chromerids * corals * dinoflagellates * inorganic carbon concentrating mechanisms * mixotrophy
OECD category: Plant sciences, botany
Impact factor: 2.923, year: 2020
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/abs/10.1111/jpy.13050

Photosynthetic dinoflagellates are ecologically and biogeochemically important in marine and freshwater environments. However, surprisingly little is known of how this group acquires inorganic carbon or how these diverse processes evolved. Consequently, how CO(2)availability ultimately influences the success of dinoflagellates over space and time remains poorly resolved compared to other microalgal groups. Here we review the evidence. Photosynthetic core dinoflagellates have a Form II RuBisCO (replaced by Form IB or Form ID in derived dinoflagellates). The in vitro kinetics of the Form II RuBisCO from dinoflagellates are largely unknown, but dinoflagellates with Form II (and other) RuBisCOs have inorganic carbon concentrating mechanisms (CCMs), as indicated by in vivo internal inorganic C accumulation and affinity for external inorganic C. However, the location of the membrane(s) at which the essential active transport component(s) of the CCM occur(s) is (are) unresolved, isolation and characterization of functionally competent chloroplasts would help in this respect. Endosymbiotic Symbiodiniaceae (in Foraminifera, Acantharia, Radiolaria, Ciliata, Porifera, Acoela, Cnidaria, and Mollusca) obtain inorganic C by transport from seawater through host tissue. In corals this transport apparently provides an inorganic C concentration around the photobiont that obviates the need for photobiont CCM. This is not the case for tridacnid bivalves, medusae, or, possibly, Foraminifera. Overcoming these long-standing knowledge gaps relies on technical advances (e.g., the in vitro kinetics of Form II RuBisCO) that can functionally track the fate of inorganic C forms.
Permanent Link: http://hdl.handle.net/11104/0314794