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It is not clear whether an endocytobiont is able to develop during a long evolution tim e only to an organelle like cell structure (defect mutant) with a high degree of m etabolic dependency or also to a perfect cell organelle with genetical dependency to the host nucleus (intercom partm ental translocation of proteins and/or gene transfer) in the sense of the Serial Endocytobiosis Hypothesis (SEH). Cyanocyta korschokoffiana, the endocyanelle of C. paradoxa, seems to be a very suitable object to answer this question. Therefore we have studied the influence of the translation inhibitors cycloheximide (CHI) and chloramphenicol (CA) on the biosynthetic behaviour of this cyanobacterial endocytobiont regarding the photosynthetic oxygen during 20 h developing and incubation time. After dilution with fresh culture medium the oxygen evolution of the control culture remains nearly constant, if it is related to the phycocyanin content, whereas it increases slowly to a constant level relating to the chlorophyll content (nearly 140-150% of the starting activity). CHI and CA show a rapid effect on the oxygen evolution. At the first 8 - 10 h the oxygen evolution of cultures treated with CA are hardly dim inished and remain more or less constant with regard to the starting activity, but that of cultures treated with CHI decreases strongly. After 24 h the CHI treated flagellate is photosynthetically inactive and far-reaching destroyed (microscopic observations), indicating that CHI has beside the inhibition effects on protein synthesis also secondary effects on the stability of membranes of C. paradoxa

zeitschrift für naturforschung c

Der einfluß von cycloheximid und chloramphenicol auf die biosynthese der photosynthese-pigmente in cyanophora paradoxa korsch. I. Photosynthetische Sauerstoffproduktion / The influence of cycloheximide and chloram phenicol on the biosynthesis of the photosynthetic pigments in cyanophora paradoxa. I. Photosynthetic Oxygen Evolution