Physiological adaptation of the diatom Pseudo-nitzschia delicatissima under copper starvation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Marine Environmental Research Année : 2023

Physiological adaptation of the diatom Pseudo-nitzschia delicatissima under copper starvation

Adaptations physiologiques de la diatomée Pseudo-nitzschia face à une carence en Cuivre

Résumé

In the open ocean and particularly in iron (Fe)-limited environment, copper (Cu) deficiency might limit the growth of phytoplankton species. Cu is an essential trace metal used in electron-transfer reactions, such as respiration and photosynthesis, when bound to specific enzymes. Some phytoplankton species, such as the diatom Pseudo-nitzschia spp. can cope with Cu starvation through adaptative strategies. In this study, we investigated the physiological strategies of the marine diatom P. delicatissima against Cu starvation. Compared to the control, Cu starvation inhibited growth by 35%, but did not induce any excess mortality. Despite the bottleneck measured in the electron flow of the photosynthetic chain, cells of P. delicatissima conserved their photosynthesis ability. This photosynthesis maintenance was accompanied by structural changes of membranes, where pigments and lipid composition were strongly modified. Diatoms also strongly modified their metabolism, by redirecting their C allocation to energy storage under the form of triglycerides. By maintaining essential metabolic functions and storing energy under the form of lipids, these physiological adaptations might be a strategy enabling this diatom to later bloom under the return of favorable nutritional condition.
Fichier principal
Vignette du fichier
PnStarvationCu_April2023_HAL_Revised.pdf (505.9 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY NC - Paternité - Pas d'utilisation commerciale

Dates et versions

hal-04080293 , version 1 (25-04-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Marc Long, Aurélie Lelong, Eva Bucciarelli, Fabienne Le Grand, Hélène Hégaret, et al.. Physiological adaptation of the diatom Pseudo-nitzschia delicatissima under copper starvation. Marine Environmental Research, 2023, 188, pp.105995. ⟨10.1016/j.marenvres.2023.105995⟩. ⟨hal-04080293⟩
26 Consultations
32 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More