Journal
PHOTOSYNTHETICA
Volume 42, Issue 2, Pages 273-281Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1023/B:PHOT.0000040600.04502.32
Keywords
absorption and fluorescence excitation spectra; carotenoids; chlorophylls; diurnal course; fluorescence induction; growth rate; photosystem 2 antenna size; phytoplankton; vertical mixing; xanthophyll cycle pigments
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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.
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