Jl. Mouget et al., LONG-TERM ACCLIMATIZATION OF SCENEDESMUS-BICELLULARIS TO HIGH-FREQUENCY INTERMITTENT LIGHTING (100 HZ) .1. GROWTH, PHOTOSYNTHESIS AND PHOTOSYSTEM-II ACTIVITY, Journal of plankton research, 17(4), 1995, pp. 859-874
Responses of the green microalga, Scenedesmus bicellularis to high-fre
quency intermittent lighting (IL, 100 Hz) were assessed after a 4 week
acclimatization. Effects of IL on growth, photosynthesis and photosys
tem II (PSII) activity were studied at limiting and saturating irradia
nces, and compared to those of continuous light (CL) of the same insta
ntaneous and daily irradiances. Even after a 4 week acclimatization pe
riod, the photosynthetic capacity (P-max), the photosynthetic efficien
cy (alpha) and the photosynthetic activity at growth irradiance, eithe
r expressed on a per cell or a chlorophyll a basis, showed little diff
erence, neither did the index of light adaptation (I-k) or PSII activi
ty. In contrast, growth was lower under IL at saturating irradiance. R
esults are discussed considering the non-linearity of the relationship
between growth or photosynthesis and irradiance.