[Effect of cations and protons on chloroplast and etioplast membranes].

The stacking of grana and intergrana tylakoids of chloroplast, etioplast and etiochloroplast membranes was studied at various concentrations of H+ and bivalent cations. It was demonstrated that bivalent cations and H+ cause stacking of all types of the membranes tested and is not strictly correlated with the presence of a well-formed ligh-harvesting chlorophyll a/b-protein complex. In preparations of intergrana tylakoids (in contrast to those of grana tylakoids) the effects of cations was minimal. The stacking of intergrana tylakoids is more appreciable in the presence of H+ which is probably due to the peculiarities of components located on the membrane surface.