Effect of nickel and Iron stress on photosynthesis and metabolite production of Heterocapsa cf. bohaiensis (dinoflagellate). - Université de la Nouvelle-Calédonie Accéder directement au contenu
Poster De Conférence Année : 2022

Effect of nickel and Iron stress on photosynthesis and metabolite production of Heterocapsa cf. bohaiensis (dinoflagellate).

Résumé

Microalgae are well known to produce valuable compounds in response to abiotic stresses. Among these stresses, metals can influence the production of primary or specific metabolites related to reactive oxygen species formation (Barra et al. 2014; Chen et al. 2017; Paliwal et al. 2017). Heterocapsa cf. bohaiensis, a newly described dinoflagellate species with haemolytic activity, and associated with shrimp (Penaeus japonicas) and crab (Eriocheir sinensis) mortalities (Xiao et al. 2018; Zhang et al. 2019), has been recently isolated in New Caledonian iron and nickel-rich waters (Merrot et al. 2022; Pelletier 2006). To induce the metallic stress and the production of metabolites, we exposed H. cf. bohaiensis to high concentrations (10-3M) of nickel (Ni2+) and/or iron (Fe2+) and investigate its photosynthetic efficiency in continuous culture using Pulse Amplitude Modulated chlorophyll fluorescence. The results indicates that H. cf. bohaiensis is tolerant to Ni2+ but sensitive to Fe2+ high concentrations, without cell death. JIP-test suggest that the reduction of photosynthesis in response to Fe2+ is due to a disruption in the electron transport chain rather than a defect in the PSII light absorption and trapping which are enhanced by Fe2+(Adamski et al. 2011; Redillas et al. 2011; Strasser et al.). These results highlight the toxic mechanisms of Fe2+ in microalgae and help to understand the production of biomass under metallic stress. Studying this species in this particular environment will also bring knowledge in the field of aquaculture and ecotoxicology, owing to the transfer of metals in the food chain (bioaccumulation, biosorption) and to the possible production of toxins. This study will also provide some insights for potential valorisations in the biotechnology and/or cosmetics fields, through the analysis of primary (pigments, fatty acids / antioxidants) and specific metabolites, with interesting activities, produced under metal stress conditions.
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Dates et versions

hal-04049873 , version 1 (29-03-2023)

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  • HAL Id : hal-04049873 , version 1

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Vincent Mériot, Alice Roussel, Nina Brunet, Nicolas Chomérat, Gwenaël Bilien, et al.. Effect of nickel and Iron stress on photosynthesis and metabolite production of Heterocapsa cf. bohaiensis (dinoflagellate).. AlgaEurope 2022, Dec 2022, Rome (Italie), Italy. ⟨hal-04049873⟩
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