Mériot V, Roussel A, Brunet N, Chomerat N, Bilien G, Le Déan L, Berteaux-Lecellier V, Coulombier N, Lebouvier N, Jauffrais T
ISEA, EA7484, Campus de Nouville, University of New Caledonia, 98851 Nouméa, New Caledonia.
Ifremer, IRD, University of New Caledonia, University of La Réunion, CNRS, UMR 9220 ENTROPIE, 101 Promenade Roger Laroque, 98897 Nouméa, New Caledonia.
Photosynthetica. 2024 Jan 2;62(1):27-39. doi: 10.32615/ps.2023.038. eCollection 2024.
Metal toxicity in marine ecosystems is a growing issue owing to terrestrial runoff and anthropogenic pollution. cf. , a newly isolated dinoflagellate from New Caledonia, was cultivated in photobioreactors operating continuously with high concentrations of nickel (1.70 10M) (Ni) and/or iron (1.79 10M) (Fe) and their photosynthetic efficiency was assessed. The photosynthetic measurements indicated that cf. was tolerant to Ni but sensitive to Fe high concentrations. In the presence of Fe, 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 Fe 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 Fe. These results bring new knowledge on the impact of nickel and iron on microalgae photosynthetic pathways.
由于陆地径流和人为污染，海洋生态系统中的金属毒性问题日益严重。例如，从新喀里多尼亚新分离出的一种甲藻，在连续运行的光生物反应器中培养，其中含有高浓度的镍（1.70×10⁻⁶M）（Ni）和/或铁（1.79×10⁻⁶M）（Fe），并评估了它们的光合效率。光合测量表明，该甲藻对镍具有耐受性，但对高浓度的铁敏感。在铁存在的情况下，最大量子效率和最大相对电子传递速率分别从0.62降至0.47和从156降至102。JIP测试表明，由于电子传递链的破坏，铁导致光合作用降低，而不是光吸收和捕获能力存在缺陷，相反，铁增强了光吸收和捕获能力。这些结果为镍和铁对微藻光合途径的影响带来了新的认识。
