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Article Dans Une Revue Environmental Pollution Année : 2020

Nanoplastics exposure modulate lipid and pigment compositions in diatoms

Résumé

The impact of nanoplastics (NP) using model polystyrene nanoparticles amine functionalized (PS-NH2) has been investigated on pigment and lipid compositions of the marine diatom Chaetoceros neogracile, at two growth phases using a low (0.05 mu g mL(-1)) and a high (5 mu g mL(-1)) concentrations for 96 h. Results evidenced an impact on pigment composition associated to the light-harvesting function and photo-protection mainly at exponential phase. NP also impacted lipid composition of diatoms with a readjustment of lipid classes and fatty acids noteworthy. Main changes upon NP exposure were observed in galactolipids and triacylglycerol's at both growth phases affecting the thylakoids membrane structure and cellular energy reserve of diatoms. Particularly, exponential cultures exposed to high NP concentration showed an impairment of long chain fatty acids synthesis. Changes in pigment and lipid content of diatom' cells revealed that algae physiology is determinant in the way cells adjust their thylakoid membrane composition to cope with NP contamination stress. Compositions of reserve and membrane lipids are proposed as sensitive markers to assess the impact of NP exposure, including at potential predicted environmental doses, on marine organisms. (C) 2020 Elsevier Ltd. All rights reserved.

Dates et versions

hal-02986936 , version 1 (03-11-2020)

Identifiants

Citer

Carmen González-Fernández, Fabienne Le Grand, Antoine Bideau, Arnaud Huvet, Ika Paul-Pont, et al.. Nanoplastics exposure modulate lipid and pigment compositions in diatoms. Environmental Pollution, 2020, 262, pp.114274. ⟨10.1016/j.envpol.2020.114274⟩. ⟨hal-02986936⟩
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