Summary
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.
In a combined freeze fracture study of HL and LL cells ofCryptomonas maculata it is demonstrated that the exoplasmic fracture face of the thylakoid membranes in HL cells possessed only 10 to 15% of the particles of the LL control; the 12.5 nm particle class was almost lacking, whereas particle populations with main sizes of 10 and 7.5 nm are preserved.
The protoplasmic face, on the other hand, was less severely affected with only slight reduction in the particle frequency and a shift of the particle size from two populations with peaks at 10 and 7.5 nm to one class centred around 7.0 nm.
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Rhiel, E., Mörschel, E. & Wehrmeyer, W. Correlation of pigment deprivation and ultrastructural organization of thylakoid membranes incryptomonas maculata following nutrient deficiency. Protoplasma 129, 62–73 (1985). https://doi.org/10.1007/BF01282306
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DOI: https://doi.org/10.1007/BF01282306