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

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Abstract

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.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Journal or Publication Title: Journal of Experimental Botany
Publisher: OUP
ISSN: 0022-0957
Official Date: 21 November 2023
Dates:
Date
Event
21 November 2023
Published
2 September 2023
Available
31 August 2023
Accepted
Volume: 74
Number: 21
Page Range: pp. 6773-6789
DOI: 10.1093/jxb/erad347
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons open licence)
Date of first compliant deposit: 1 September 2023
Date of first compliant Open Access: 11 October 2023
RIOXX Funder/Project Grant:
Project/Grant ID
RIOXX Funder Name
Funder ID
UNSPECIFIED
[NERC] Natural Environment Research Council
730984
European Union Horizon programme
UNSPECIFIED
Related URLs:
URI: https://wrap.warwick.ac.uk/178941/

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