Summary
The regreening of etiolatedEuglena gracilis under intermittent light of 2 minutes light/98 minutes darkness was re-examined. In contrast to other investigations theEuglena culture medium contained no organic carbon compound. Therefore the known catabolic repression of thylakoid differentiation,i.e., of chlorophyll-protein complex assembly inEuglena gracilis was avoided. Under these conditions the light-harvesting chlorophyll a/b protein complex (LHCP) was assembled and inserted into the thylakoids. This was demonstrated by (i) the presence of chlorophyll b, (ii) the presence of the LHCP apoproteins and (iii) the proof of thylakoid stacking. These results, which are in contrast to earlier observations, are discussed with regard to the different levels of regulation of chloroplast differentiation inEuglena gracilis and in higher plants.
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Abbreviations
- CL:
-
continuous light
- EDTA:
-
ethylenediaminetetraacetic acid
- IL:
-
intermittent light
- kDa:
-
kilodalton
- LHCP:
-
lightharvesting chlorophyll a/b protein complex
- SDS:
-
sodium dodecyl sulfate
- Tricine:
-
N-tris(hydroxymethyl)methylglycine
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Brandt, P., Winter, J. The influence of permanent light and of intermittent light on the reconstitution of the light-harvesting system in regreeningEuglena gracilis . Protoplasma 136, 56–62 (1987). https://doi.org/10.1007/BF01276318
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DOI: https://doi.org/10.1007/BF01276318