Photoprotection strategies of the alga Nannochloropsis gaditana

Biochimica Et Biophysica Acta. Bioenergetics
Volha U ChukhutsinaRoberta Croce

Abstract

Nannochloropsis spp. are algae with high potential for biotechnological applications due to their capacity to accumulate lipids. However, little is known about their photosynthetic apparatus and acclimation/photoprotective strategies. In this work, we studied the mechanisms of non-photochemical quenching (NPQ), the fast response to high light stress, in Nannochloropsis gaditana by "locking" the cells in six different states during quenching activation and relaxation. Combining biochemical analysis with time-resolved fluorescence spectroscopy, we correlated each NPQ state with the presence of two well-known NPQ components: de-epoxidized xanthophylls and stress-related antenna proteins (LHCXs). We demonstrated that after exposure to strong light, the rapid quenching that takes place in the antennas of both photosystems was associated with the presence of LHCXs. At later stages, quenching occurs mainly in the antennas of PSII and correlates with the amount of de-epoxidised xanthophylls. We also observed changes in the distribution of excitation energy between photosystems, which suggests redistribution of excitation between photosystems as part of the photo-protective strategy. A multistep model for NPQ induction and relaxation in...Continue Reading

Citations

Jan 10, 2019·PloS One·Gunvor Bjerkelund RøkkeMartin F Hohmann-Marriott
Apr 29, 2018·Photosynthesis Research·Makio YokonoAyumi Tanaka
Aug 30, 2018·Biochemical Society Transactions·Vasco Giovagnetti, Alexander V Ruban
Nov 28, 2018·Photosynthesis Research·Volha U ChukhutsinaRoberta Croce
Feb 28, 2019·Proceedings of the National Academy of Sciences of the United States of America·Soomin ParkGraham R Fleming
Jun 4, 2019·Biochimica Et Biophysica Acta. Bioenergetics·Claudia Büchel

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