The effect of growth conditions on the light-harvesting apparatus in Rhodopseudomonas acidophila (original) (raw)
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Abstract
The detailed effect on the light-harvesting apparatus of three different wild-type strains of Rhodopseudomonas acidophila in response to changes in both light-intensity and temperature have been investigated. In all three strains at high light-intensities (160 μmol s m2 and above) the only LH2 antenna complex synthesised is the B800–850 complex. In strains 7050 and 7750 as the light-intensity is lowered the B800–850 complex is gradually replaced by another type of LH2 the B800–820 complex. However, at no light-intensities studied is this changeover complete when the cells are grown at 30°C. If however, the light-intensity is lowered at temperatures below 25°C with strain 7750 there is a complete replacement of the B800–850 complex by the B800–820 complex. At all light-intensities and temperatures tested, strain 10050 only synthesised the B800–850 complex. Strain 7050 also responded to changes in light-intensity by altering its carotenoid composition. At high light-intensity the major carotenoids were rhodopin and rhodopin-glucoside, while at low light-intensities the major ones were rhodopinal and rhodopinal-glucoside. This change in carotenoid content started to occur at rather higher light-intensities than the switchover from B800–850 to B800–820.
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Authors and Affiliations
- Department of Botany, University of Glasgow, G12 8QQ, Glasgow, UK
Alastair T. Gardiner & Richard J. Cogdell - Biological Laboratory, Nippon Medical School, Kosugi, 211, Nakahara, Kawasaki, Japan
Shinichi Takaichi
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- Alastair T. Gardiner
You can also search for this author inPubMed Google Scholar - Richard J. Cogdell
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Gardiner, A.T., Cogdell, R.J. & Takaichi, S. The effect of growth conditions on the light-harvesting apparatus in Rhodopseudomonas acidophila.Photosynth Res 38, 159–167 (1993). https://doi.org/10.1007/BF00146415
- Received: 11 March 1993
- Accepted: 06 September 1993
- Issue Date: November 1993
- DOI: https://doi.org/10.1007/BF00146415