Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence
| Type | Article | ||||||||||||
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| Date | 2024-01-02 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Mériot V.1, 2, Roussel Amelie1, 2, Brunet N.3, Chomerat Nicolas 4, Bilien Gwenael4, Le Déan Loic2, Berteaux-Lecellier V.5, Coulombier N.6, Lebouvier N.1, Jauffrais Thierry2 |
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| Affiliation(s) | 1 : ISEA, EA7484, Campus de Nouville, University of New Caledonia, 98851 Nouméa, New Caledonia 2 : Ifremer, IRD, University of New Caledonia, University of La Réunion, CNRS, UMR 9220 ENTROPIE, 101 Promenade Roger Laroque, 98897 Nouméa, New Caledonia 3 : CRESICA, 98851 Nouméa, New Caledonia 4 : Ifremer, Littoral - LERBO, Place de la Croix, Concarneau, F-29900, France 5 : CNRS, Ifremer, IRD, University of New Caledonia, University of La Réunion, UMR 9220 ENTROPIE, 101 Promenade Roger Laroque, Nouméa, New Caledonia 6 : ADECAL Technopole, 1 Bis Rue Berthelot, 98846 Nouméa, New Caledonia |
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| Source | Photosynthetica (0300-3604) (Institute of Experimental Botany), 2024-01-02 , Vol. 62 , N. 1 , P. 27-39 | ||||||||||||
| DOI | 10.32615/ps.2023.038 | ||||||||||||
| Keyword(s) | dinoflagellate, metal stress, metallic trace elements, microalgae, PAM fluorometry, photosynthesis. | ||||||||||||
| Abstract | 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. |
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