Lidar in-situ study of sunlight regulation of phytoplankton photosynthetic activity and chlorophyll fluorescence

M. Yu. Gorbunov; Alexander M. Chekalyuk

doi:10.1117/12.146168

17 June 1993 Lidar in-situ study of sunlight regulation of phytoplankton photosynthetic activity and chlorophyll fluorescence

M. Yu. Gorbunov, Alexander M. Chekalyuk

Author Affiliations +

Proceedings Volume 1922, Laser Study of Macroscopic Biosystems; (1993) https://doi.org/10.1117/12.146168
Event: Laser Spectroscopy of Biomolecules: 4th International Conference on Laser Applications in Life Sciences, 1992, Jyvaskyla, Finland

Abstract

Mechanisms of solar illumination influence on phytoplankton chlorophyll-a fluorescence and photosynthetic activity were investigated in situ by means of lidar implementation of the pump-and-probe technique. It has been found that for subsurface phytoplankton the main mechanisms of sunlight regulation were photoinhibition of primary photosynthesis processes by excessive light, dominating at illuminations more than 40 klx, and `energy-dependent' fluorescence quenching, at illuminations 5 - 20 klx. The potential role of other regulating mechanisms (photophosphorylation of pigment-protein complexes, spillover, xanthophyll cycle, lipids, and pigments photodestruction) are discussed and analyzed.

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M. Yu. Gorbunov and Alexander M. Chekalyuk "Lidar in-situ study of sunlight regulation of phytoplankton photosynthetic activity and chlorophyll fluorescence", Proc. SPIE 1922, Laser Study of Macroscopic Biosystems, (17 June 1993); https://doi.org/10.1117/12.146168

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