Nitrate assimilation and regulation of biosynthesis and disintegration of phycobiliproteids by Cyanophora paradoxa - indications for a nitrogen store function of the phycobiliproteids
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167 - 176
- Zusammenfsg.
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Simultaneous estimation of the nitrate concentration in the medium and of the content of proteins and pigments in the cells of C. paradoxa during nitrate starvation-induced chlorosis gives rise to the assumption that the phycobiliproteids serve not only as accessoric pigments but also as nitrogen storage in C. paradoxa. This idea is supported by a comparison with the growth behaviour of G. nostochinearum cultures which do not show the same strong dependency of the cellular phycobiliproteid content on the nitrate concentration in the medium. The reported observations are further indications for the high degree of adaptation which the endocyanelles of C. paradoxa have reached during coevolution with their symbiotic host cell.
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