Abstract
Chlorella pyrenoidosa was grown in three continuous cultures each receiving a different light regime during the light period of a diurnal cycle. Hourly samples taken during the light period were subjected to medium frequency light/dark oscillations of equal duration, ranging from 3 to 240 seconds. The oxygen consumption and production of each sample were measured with an oxygen electrode in a small oxygen chamber. Although the light/dark cycles had little overall influence on photosynthetic activity, the microalgae appeared to adapt to the light regime to which they were subjected. Large differences were found between the maximum chlorophyll-specific production rates (P supBinfmax ), the chlorophyll-specific production rates (PB) and the respiration rates between the cultures and treated subsamples. Respiration rates increased during the light period, whilst PB either increased, or had a mid light period minimum or maximum. The culture which received an hourly light oscillation during the light period had the highest P supBinfmax and lowest respiration rates, and it is suggested that these algae react as in nature, whereas either a sinusoidal or a block light pattern is ‘unnatural’. The latter light regime is commonly used in laboratory studies.
Similar content being viewed by others
References
Cullen, J. J. & M. R. Lewis, 1988. The kinetics of algal photoadaptation in the context of vertical mixing. J. Plankton Res. 10: 1039–1063.
Dera, J., 1970. On two layers of different light conditions in the euphotic zone of the sea. Acta Geophys. Pol. 18: 287–294.
Dubinsky, Z., P. G. Falkowski, A. F. Post & U. M.Van Hess, 1987. A system for measuring phytoplankton photosynthesis in a defined field with an oxygen electrode. J. Plankton Res. 9: 607–612.
Falkowski, P. G. & C. D. Wirick, 1981. A simulation model of the effects of vertical mixing on primary productivity. Mar. Biol. 65: 69–75.
Grobbelaar, J. U., 1985. Phytoplankton productivity in turbid waters. J. Plankton Res. 7: 653–663.
Grobbelaar, J. U., 1989. Do light/dark cycles of medium frequency enhance phytoplankton productivity?J. appl. Phycol. 1: 333–340.
Grobbelaar, J. U., 1991. The influence of light/dark cycles in mixed cultures on their productivity. Bioresource Technology 38: 189–194.
Grobbelaar, J. U. & C. J. Soeder, 1985. Respiration losses in planktonic green algae cultivated in raceway ponds. J. Plankton Res. 7: 497–506.
Jewson, D. H. & R. B. Wood, 1975. Some effects of integral photosynthesis of artificial circulation of phytoplankton through light gradients. Verh. int. Ver. Limnol. 19: 1037–1044.
Kok, B., 1953. Experiments of photosynthesis by Chlorella in flashing light. In J. S. Burlew (ed.), Algal Cultures from Laboratory to Pilot Plant. Carnegie Institution of Washington, Washington D.C., 63–158.
Kroon, B., U. M.van Hes & L. R. Mur, 1992a. An algal cyclostat with computer-controlled dynamic light regime. Hydrobiologia 238: 63–70.
Kroon, B., M. Latasa, B. W. Ibelings & L. R. Mur, 1992b. The effect of dynamic light regimes on Chlorella. I: Pigments and cross sections. Hydrobiologia 238: 71–78.
Laws, E. A., K. L. Terry, J. Wickman & M. S. Challup, 1983. A simple algal production system designed to utilize the flashing light effect. Biotech. Bioeng. 25: 2319–2335.
Legendre, L., M. Rochet & S. Demers, 1986. Sea-ice microalgae to test the hypothesis of photosynthetic adaptation to high frequency light fluctuations. J. exp. mar. Biol. Ecol. 97: 321–326.
Mann, K. H., R. H. Britton, A. Kowalczewski, T. J. Lack, C. P. Mathews & I.McDonald, 1972. Productivity and energy flow at all trophic levels in the River Thames, England. In Z. Kajak & A.Hillbricht-Ilkowska(eds), Productivity Problems of Freshwaters: Proc. IBP-UNESCO Symp.Warsaw-Krakow: Polish Scientific Publ., 579–596.
Marra, J., 1980. Vertical mixing and primary production. In P. G. Falkowski (ed.), Primary productivity in the sea. Plenum Press, New York, 121–137.
Richmond, A. & A. Vonshak, 1978. Spirulina culture in Israel. Arch. Hydrobiol. Beih., Ergebn. Limnol. 11: 274–280.
Terry, K. L., 1986. Photosynthesis in modulated light: Quantitative dependence of photosynthetic enhancement on flashing rate. Biotech. Bioengineering. 18: 988–995.
Walsh, P. & L. Legendre, 1983. Photosynthesis of natural phytoplankton under high frequency light fluctuations simulating those induced by sea surface waves. Limnol. Oceanogr. 28: 688–697.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Grobbelaar, J.U., Kroon, B.M.A., Burger-Wiersma, T. et al. Influence of medium frequency light/dark cycles of equal duration on the photosynthesis and respiration of Chlorella pyrenoidosa . Hydrobiologia 238, 53–62 (1992). https://doi.org/10.1007/BF00048773
Issue Date:
DOI: https://doi.org/10.1007/BF00048773