Stadienspezifische Thylakoiddifferenzierung der Endocyanelle Cyanocyta korschikoffiana in der symbiontischen Assoziation mit Cyanophora paradoxa / Growth Specific Thylakoid Differentiation of the Endocyanelle Cyanocyta korschikoffiana in the Symbiotic Association with Cyanophora paradoxa

Abstract

The thylakoid differentiation in the endosymbiotic cyanelle Cyanocyta korschikoffiana depends on the developmental stage of the whole symbiotic association Cyanophora-Cyanocyta. During culturing under permanent light the intrinsic or extrinsic location and the amount of the chlorophyll-protein complexes and of the phycobilines in the thylakoids change markedly. During this modification of the thylakoids the reaction centers of phytosystem I and II are more and more protected by other proteins. Moreover the amount of phycobilisomes increases in relation to the amount of the chlorophyll-protein complexes. The energy transfer becomes more and more efficient. All these aspects show the typical behaviour of a mass culture of a free-living blue-green alga and imply that Cyanocyta korschikoffiana is a symbiotic cyanelle much more than a chloroplast-like organelle.