Photosynthetica 2004, 42(2):273-281 | DOI: 10.1023/B:PHOT.0000040600.04502.32

Photoacclimation of Dunaliella tertiolecta (Chlorophyceae) Under Fluctuating Irradiance

H. Havelková-Doušová1, O. Prášil1, M.J. Behrenfeld2
1 Institute of Microbiology, Academy of Sciences of the Czech Republic, Opatovický mlýn, Třeboň 37981, Czech Republic; Biological Faculty and Institute of Physical Biology, University of South Bohemia, České Budějovice, Czech Republic
2 NASA Goddard Space Flight Center, Greenbelt, USA

We investigated photoacclimation of Dunaliella tertiolecta (Butcher) in irradiance (I) regimes simulating mixed layer conditions of turbid estuarine waters or lakes. D. tertiolecta was exposed to a range of fixed I regimes to establish baseline physiology-I relationships that were compared with subsequent photoacclimation to a simulated mixed layer. Measured indices of photoacclimation included cellular pigmentation, chlorophyll variable fluorescence, and effective photosystem 2 antenna size. While D. tertiolecta grown under fluctuating I maintained division rates comparable to cells grown at high I, the cells exhibited characteristics of photoacclimation consistent with cells grown under a stable regimes at irradiances considerably lower than the average I of the simulated mixed layer.

Additional key words: absorption and fluorescence excitation spectra; carotenoids; chlorophylls; diurnal course; fluorescence induction; growth rate; photosystem 2 antenna size; phytoplankton; vertical mixing; xanthophyll cycle pigments

Published: June 1, 2004  Show citation

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Havelková-Doušová, H., Prášil, O., & Behrenfeld, M.J. (2004). Photoacclimation of Dunaliella tertiolecta (Chlorophyceae) Under Fluctuating Irradiance. Photosynthetica, 42(2), 273-281. doi: 10.1023/B:PHOT.0000040600.04502.32
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