FLUORESCENCE OF WHITE SEA PHYTOPLANKTON UNDER DIFFERENT NITROGEN SOURCE AND TWO LEVELS OF IRRADIANCE
https://doi.org/10.1234/XXXX-XXXX-2012-3-33-38
Abstract
The response of phytoplankton fluorescence and biomass to addition of different nitrogen sources and irradiance were assayed in enriched bottle experiments with the White Sea phytoplank ton in August—September 2007. Phytoplankton was exposed in situ 18 days with the additions of 180 mM/L of nitrogen as nitrate, urea, ammonium and glycine under two levels of irradiance. The maximum quantum efficiency of PSII (Fv/Fm) was determined in the dark-acclimated algae. Rapid light curves (RLC) were constructed based on 8 actinic increasing light levels. The maximal relative electron transport rate (rETRmax), the maximum light use coefficient (a), and the non-photochemical quenching (NPQ) were calculated. After enrichment abundance of phytoplankton increased, and the photosynthetic parameters changed. The maximum quantum efficiency of PSII increased to 0,64—0,71, indicating a good physiological state of algae and a lack of stress due to nutrient limitation. The dynamic of rETRmax and NPQ depended on nitrogen source and growth irradiances while a did not depended on nitrogen form.
About the Authors
L. V. IlyashRussian Federation
T. A. Belevich
Russian Federation
D. N. Matorin
Russian Federation
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Review
For citations:
Ilyash L.V., Belevich T.A., Matorin D.N. FLUORESCENCE OF WHITE SEA PHYTOPLANKTON UNDER DIFFERENT NITROGEN SOURCE AND TWO LEVELS OF IRRADIANCE. Vestnik Moskovskogo universiteta. Seriya 16. Biologiya. 2012;(3):33-38. (In Russ.) https://doi.org/10.1234/XXXX-XXXX-2012-3-33-38
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