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Quenching of chlorophyll triplet states by carotenoids in algal light-harvesting complexes related to fucoxanthin-chlorophyll protein

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Abstract

We have used time-resolved absorption and fluorescence spectroscopy with nanosecond resolution to study triplet energy transfer from chlorophylls to carotenoids in a protective process that prevents the formation of reactive singlet oxygen. The light-harvesting complexes studied were isolated from Chromera velia, belonging to a group Alveolata, and Xanthonema debile and Nannochloropsis oceanica, both from Stramenopiles. All three light-harvesting complexes are related to fucoxanthin-chlorophyll protein, but contain only chlorophyll a and no chlorophyll c. In addition, they differ in the carotenoid content. This composition of the complexes allowed us to study the quenching of chlorophyll a triplet states by different carotenoids in a comparable environment. The triplet states of chlorophylls bound to the light-harvesting complexes were quenched by carotenoids with an efficiency close to 100%. Carotenoid triplet states were observed to rise with a ~5 ns lifetime and were spectrally and kinetically homogeneous. The triplet states were formed predominantly on the red-most chlorophylls and were quenched by carotenoids which were further identified or at least spectrally characterized.

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Acknowledgements

This study was supported by Czech Science Foundation projects P501/12/G055 and 14-01377P and by institutional funding RVO:60077344. Discussions with Prof. Herbert van Amerongen from the Wageningen University are greatly appreciated. We are indebted to Dr. Sarah Henry from Glasgow University for careful proofreading of the manuscript.

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Correspondence to Jakub Pšenčík.

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Khoroshyy, P., Bína, D., Gardian, Z. et al. Quenching of chlorophyll triplet states by carotenoids in algal light-harvesting complexes related to fucoxanthin-chlorophyll protein. Photosynth Res 135, 213–225 (2018). https://doi.org/10.1007/s11120-017-0416-5

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