Light-harvesting in Acaryochloris marina--spectroscopic characterization of a chlorophyll d-dominated photosynthetic antenna system.
Oxygenic photosynthesis of the prokaryote Acaryochloris marina involves chlorophyll d (Chl d) as the major pigment [Miyashita et al. (1996) Nature 383, 402]. Four spectral forms of Chl d (peak wavelengths: 694, 714, 726 and 740 nm) are resolvable by low-temperature absorption spectroscopy on intact cells. Based on fluorescence spectra (at 290 K and 77 K) and on analysis of fluorescence induction curves we conclude: (1) excitation energy is efficiently transferred between the various spectral forms of Chl d and the PS II reaction center; (2) Chl d serves as a light-harvesting pigment for both, Photosystem II (PS II) and PS I; (3) excitation energy transfer between PS II units occurs.
Schiller
H
H
FB Biologie/Botanik, Philipps-Universität Marburg, Germany.
Senger
H
H
Miyashita
H
H
Miyachi
S
S
Dau
H
H
D002734:Chlorophyll / Q000737:chemistry* / Q000502:physiology; D000458:Cyanobacteria / Q000737:chemistry*; D004237:Diuron / Q000494:pharmacology; D008027:Light; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013696:Temperature
D045322:Photosynthetic Reaction Center Complex Proteins; D002734:Chlorophyll; C107509:chlorophyll d; D004237:Diuron