Abstract
The photosynthetic pigments of the marine algaCryptomonas maculata are decreased under energy fluence rates of 4.4 Wm−2 (high light=HL). That this is a result of nitrogen deprivation following an increased cell growth rate triggered by high light in comparison to the control under 1.28 Wm−2 (low light=LL) is evident from combined pigment, growth rate and nutrient analyses. Fine structural studies by electron microscopy revealed that the electron opaque material in the thylakoid lumen of the plastid is lost under high light treatment parallel to the severe loss of almost 90% phycoerythrin-545. The reduction of chlorophylla andc is accompanied by a reversible disorganization of the thylakoid packing and the thylakoid membranes.
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