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Fluorescence induction m easurem ents indicate a PS II α,β  heterogeneity in the unicellular green alga Chlorella fusca. Under normal light the relative amount of PS α  II is decreasing from 63% to 43% during the first 8 h of the cell cycle. The rate constant k α  shows a concomitant decrease by 20% in the first 4 h. The relative amount and antenna size of PS II α  is restored in the dark. In contrast, PS II β  - centres show the same rate constant during the whole cell cycle. Under low light k α  is increased by approximately 30% over the cell cycle, whereas no change of k β  is observed. It is concluded that the PS II organization of Chlorella is changed both during the cell cycle and the adaptation to light intensity by a complex regulation (i) involving the antenna size of α-centres and (ii) changing the quantitative relationship of fast and slow reaction centres.

PS II α/ß Heterogeneity during the Cell Cycle of the Unicellular Green Alga Chlorella fusca