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Proceedings Paper

Lidar in-situ study of sunlight regulation of phytoplankton photosynthetic activity and chlorophyll fluorescence
Author(s): M. Yu. Gorbunov; Alexander M. Chekalyuk
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Paper 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.

Paper Details

Date Published: 17 June 1993
PDF: 7 pages
Proc. SPIE 1922, Laser Study of Macroscopic Biosystems, (17 June 1993); doi: 10.1117/12.146168
Show Author Affiliations
M. Yu. Gorbunov, Moscow State Univ. (Russia)
Alexander M. Chekalyuk, Moscow State Univ. (Russia)


Published in SPIE Proceedings Vol. 1922:
Laser Study of Macroscopic Biosystems

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