Kinetics of the xanthophyll cycle and its role in photoprotective memory and response

Audrey Short, Thomas P. Fay, Thien Crisanto, Ratul Mangal, Krishna K. Niyogi, David T. Limmer and Graham R. Fleming ()
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Audrey Short: University of California
Thomas P. Fay: University of California Berkeley
Thien Crisanto: Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National Laboratory
Ratul Mangal: University of California Berkeley
Krishna K. Niyogi: Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National Laboratory
David T. Limmer: Kavli Energy Nanoscience Institute
Graham R. Fleming: University of California

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Efficiently balancing photochemistry and photoprotection is crucial for survival and productivity of photosynthetic organisms in the rapidly fluctuating light levels found in natural environments. The ability to respond quickly to sudden changes in light level is clearly advantageous. In the alga Nannochloropsis oceanica we observed an ability to respond rapidly to sudden increases in light level which occur soon after a previous high-light exposure. This ability implies a kind of memory. In this work, we explore the xanthophyll cycle in N. oceanica as a short-term photoprotective memory system. By combining snapshot fluorescence lifetime measurements with a biochemistry-based quantitative model, we show that short-term memory arises from the xanthophyll cycle. In addition, the model enables us to characterize the relative quenching abilities of the three xanthophyll cycle components. Given the ubiquity of the xanthophyll cycle in photosynthetic organisms the model described here will be of utility in improving our understanding of vascular plant and algal photoprotection with important implications for crop productivity.

Date: 2023
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DOI: 10.1038/s41467-023-42281-8

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