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Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus, an ecologically important photosynthetic picoeukaryote
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Sands, Elizabeth, Wynne Davies, Siân Elizabeth, Puxty, Richard John, Vergé, Valerie, Bouget, Francois-Yves, Scanlan, David J. and Carré, Isabelle A. (2023) Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus, an ecologically important photosynthetic picoeukaryote. Journal of Experimental Botany, 74 (21). pp. 6773-6789. doi:10.1093/jxb/erad347 ISSN 0022-0957.
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Official URL: https://doi.org/10.1093/jxb/erad347
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 | |||||||||
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| 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: |
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| 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) | |||||||||
| Date of first compliant deposit: | 1 September 2023 | |||||||||
| Date of first compliant Open Access: | 11 October 2023 | |||||||||
| RIOXX Funder/Project Grant: |
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