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An ultrastructural, morphometrical and biochemical comparison. Z NATURFORSCH 41C: 741-750. The effect of sulfate and phosphate starvation on cylindrospermopsin content in the cyanobacterium Aphizomenon ovalisporum Bácsi, I. - Vasas, G. - Surányi, Gy. - M-Hamvas, M. - Máthé, Cs. - Tóth, Sz. - Borbély, Gy. University of Debrecen, Department of Botany, Hungary 4010. Debrecen, Egyetem tér 1. Abstract: The effect of sulfate and phosphate starvation on cylindrospermopsin level in Aphizomenon ovalisporum ILC-164 was studied. The lack of sulfate results an immediate stop of growth, while the phosphate starvation reduces the growth but it is not completely abolished. Both sulfate and phosphate starvation cause a significant decrease of cylindrospermopin pool size but not at the same rate. It depends on that the toxin content is counted per mg dry mass or per cell. The difference in reduction rate of cylindrospermopsin based on dry mass and cell number upon sulfate or phosphate deprivation may be the consequence of the rearrangement of starved cell metabolism. Keywords: Aphizomenon ovalisporum , sulfate starvation, phosphate starvation, cylindrospermopsin Klossy Irén alkotása (Fametszet, Magyar tájak sorozat)
