Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

Metal toxicity in marine ecosystems is a growing issue owing to terrestrial runoff and anthropogenic pollution. Heterocapsa cf. bohaiensis, a newly isolated dinoflagellate from New Caledonia, was cultivated in photobioreactors operating continuously with high concentrations (10-3 M) of nickel (Ni2+) and/or iron (Fe2+) and their photosynthetic efficiency was assessed. The photosynthetic measurements indicated that H. cf. bohaiensis was tolerant to Ni2+ but sensitive to Fe2+ high concentrations. In the presence of Fe2+, maximum quantum efficiency and maximal relative electron transport rate decreased from 0.62 to 0.47 and from 156 to 102, respectively. The JIP-tests suggested a reduction of the photosynthesis in response to Fe2+ due to a disruption in the electron transport chain rather than a defect in the light absorption and trapping capacity which were on the contrary enhanced by Fe2+. These results bring new knowledge on the impact of nickel and iron on microalgae photosynthetic pathways.

Keyword(s)

dinoflagellate, metal stress, metallic trace elements, microalgae, PAM fluorometry, photosynthesis.

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Mériot V., Roussel Amelie, Brunet N., Chomerat Nicolas, Bilien Gwenael, Le Déan Loic, Berteaux-Lecellier V., Coulombier N., Lebouvier N., Jauffrais Thierry (2024). Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence. Photosynthetica. 62 (1). 27-39. https://doi.org/10.32615/ps.2023.038, https://archimer.ifremer.fr/doc/00869/98122/

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