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1 June 2004 Involvement of Cyanobacterial Phytochromes in Growth Under Different Light Qualities and Quantities
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Abstract

Inactivation of the genes for the cyanobacterial phytochromes cph1 and cph2 in the unicellular cyanobacterium Synechocystis sp. strain PCC 6803 affected the growth of the cells under certain light conditions. Differences in growth were detected by recording growth curves and in competition experiments. Mutation of cph1 and cph2 resulted in different effects. The cph1 mutant strains exhibited a reduced growth rate under far-red light (FRL), whereas the growth of the cph2 mutant strains was inhibited by red light (RL). The growth rate of a cph1/cph2 double mutant was reduced under both RL and FRL. Furthermore, cph1, cph2 as well as double-mutant strains showed impaired growth under high-light (HL) conditions. Acclimation of the photosynthetic apparatus of the mutants to RL, FRL and HL, as determined by pigment analysis, was similar to that of the wild type.

Brita Fiedler, David Broc, Hendrik Schubert, Anne Rediger, Thomas Börner, and Annegret Wilde "Involvement of Cyanobacterial Phytochromes in Growth Under Different Light Qualities and Quantities," Photochemistry and Photobiology 79(6), 551-555, (1 June 2004). https://doi.org/10.1562/RN-013R.1
Received: 27 November 2003; Accepted: 1 February 2004; Published: 1 June 2004
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