Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus , an ecologically important photosynthetic picoeukaryote - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Experimental Botany Année : 2023

Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus , an ecologically important photosynthetic picoeukaryote

Elizabeth Sands
Sian Davies
Richard John Puxty
Valerie Vergé
  • Fonction : Auteur
David John Scanlan
Isabelle Alice Carré
  • Fonction : Auteur
  • PersonId : 1308680

Résumé

Phytoplankton are exposed to dramatic variations in light quality when cells are carried by upwelling or downwelling currents or encounter sediment. We investigated the potential impact of light quality changes in Ostreococcus, a key marine photosynthetic picoeukaryote, by analysing changes in its transcriptome, pigment content, and photophysiology after acclimation to monochromatic red, green, or blue light. The clade B species RCC809, isolated from the deep euphotic zone of the tropical Atlantic Ocean, responded to blue light by accelerating cell division at the expense of storage reserves and by increasing the relative level of blue-light-absorbing pigments. It responded to red and green light by increasing its potential for photoprotection. In contrast, the clade A species OTTH0595, which originated from a shallow water environment, showed no difference in photosynthetic properties and minor differences in carotenoid contents between light qualities. This was associated with the loss of candidate light-quality responsive promoter motifs identified in RCC809 genes. These results demonstrate that light quality can have a major influence on the physiology of eukaryotic phytoplankton and suggest that different light quality environments can drive selection for diverse patterns of responsiveness and environmental niche partitioning.
Fichier principal
Vignette du fichier
erad347 (1).pdf (1.92 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04286525 , version 1 (15-11-2023)

Identifiants

Citer

Elizabeth Sands, Sian Davies, Richard John Puxty, Valerie Vergé, François-Yves Bouget, et al.. Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus , an ecologically important photosynthetic picoeukaryote. Journal of Experimental Botany, 2023, ⟨10.1093/jxb/erad347⟩. ⟨hal-04286525⟩
24 Consultations
11 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More