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Spectral anisotropy of chloroplasts, subchloroplast particles and pigment-protein complexes

, : Spectral anisotropy of chloroplasts, subchloroplast particles and pigment-protein complexes. Biofizika 26(2): 288-294

Anisotropic properties of pea chloroplasts, subchloroplast fragments (photosystem 1 particles and pigment-protein complexes) and the blue-green algae oriented in polyacrylamide gel were investigated. It was shown that linear dichroism spectra of chloroplasts are the superposition of the corresponding spectra for the main light harvesting complex (HMLC) and P 700 chlorophyll a--protein complex (CP 1). Anisotropic properties of the photosystem 1 particles and blue-green algae are mainly caused by CP 1 anisotropy. Qy-transition moments tend to perpendicular orientation to the membrane plane for the Chl. b 649, Chl. a 660 and parallel orientation--for Chl. b 654, Chl. a 682. The degree of Qy-transition moments parallel orientation is higher for the longwave forms (Chl. a 690, Chl. a 702, Chl. a 712), than for the shortwave ones and coincides with this degree for the reaction centre pigment P 700 transition moment. It is suggested that the specific orientation of the pigment-protein complexes in the chloroplast membrane is important for the regulation of the spillover between two photosystems.

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Accession: 044375194

PMID: 6789891

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