Diversity of CO2-concentrating mechanisms and responses to CO2 concentration in marine and freshwater diatoms

Clement, Romain; Jensen, Erik; Prioretti, Laura; Maberly, Stephen C. ORCID: https://orcid.org/0000-0003-3541-5903; Gontero, Brigitte. 2017 Diversity of CO2-concentrating mechanisms and responses to CO2 concentration in marine and freshwater diatoms. Journal of Experimental Botany, 68 (14). 3925-3935. https://doi.org/10.1093/jxb/erx035

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Abstract/Summary

The presence of CO2-concentrating mechanisms (CCMs) is believed to be one of the characteristics that allows diatoms to thrive in many environments and to be major contributors to global productivity. Here, the type of CCM and the responses to variable CO2 concentration were studied in marine and freshwater diatoms. At 400 ppm, there was a large diversity in physiological and biochemical mechanisms among the species. While Phaeodactylum tricornutum mainly used HCO3–, Thalassiosira pseudonana mainly used CO2. Carbonic anhydrase was an important component of the CCM in all species and C4 metabolism was absent, even with T. weissflogii. For all species, at 20 000 ppm, the affinity for dissolved inorganic carbon was lower than at 400 ppm CO2 and the reliance on CO2 was higher. Despite the difference in availability of inorganic carbon in marine and fresh waters, there were only small differences in CCMs between species from the two environments, and Navicula pelliculosa behaved similarly when grown in the two environments. The results suggest that species-specific differences are great, and more important than environmental differences in determining the nature and effectiveness of the CCM in diatoms.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1093/jxb/erx035
UKCEH and CEH Sections/Science Areas:	Parr
ISSN:	0022-0957
Additional Keywords:	bicarbonate use, carbonic anhydrase, C4 photosynthesis, carbon dioxide-concentrating mechanism, CCM, diatoms, PEP carboxylase, pH-drift, photosynthesis, PPDK, Rubisco
NORA Subject Terms:	Marine Sciences Botany
Date made live:	16 Oct 2017 10:55 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/518004

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