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Effects of illumination intensity on bacteriochlorophyllc homolog distribution inChloroflexus aurantiacus grown under controlled conditions.
Photosynthesis Research 1994 July
Green photosynthetic bacteria contain a mixture of stereoisomers and homologs of their major light harvesting pigment, bacteriochlorophyll (BChl)c. We have determined the distribution of photosynthetic pigments in the green filamentous bacteriumChloroflexus aurantiacus grown in turbidostat culture under light-limited conditions at 5 different illumination intensities. Pigments were extracted from isolated cells, analyzed by HPLC, and the homologs of BChlc identified by their mass spectra. The ratio between BChlc, BChla and carotenoid remained constant at low illumination intensities; at higher intensities BChla and carotenoid increased in parallel compared to BChlc. The BChlc homolog distribution changed even under conditions where the ratio of the total amount to the other pigments was unchanged, but there were no evidence for a constant stoichiometric ratio between any pair of homologs.
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