2004
DOI: 10.1562/rn-013r.1
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Involvement of Cyanobacterial Phytochromes in Growth Under Different Light Qualities and Quantities¶

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 ligh… Show more

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Cited by 32 publications
(24 citation statements)
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“…At photoequilibrium, the fluorescence levels at 40% relative to P r . Thus, we obtained a photostationary equilibrium portion of the P fr state of 60% () which agrees with the results reported for the 58% in vivo portion of P fr of Syn Cph2 (38). The destabilization of the P fr state observed for the mutant Y47H of Cph2(1,2) was reflected by a P fr portion of 51% ().…”
Section: Resultssupporting
confidence: 90%
“…At photoequilibrium, the fluorescence levels at 40% relative to P r . Thus, we obtained a photostationary equilibrium portion of the P fr state of 60% () which agrees with the results reported for the 58% in vivo portion of P fr of Syn Cph2 (38). The destabilization of the P fr state observed for the mutant Y47H of Cph2(1,2) was reflected by a P fr portion of 51% ().…”
Section: Resultssupporting
confidence: 90%
“…Growth and cell densities were followed by measuring absorption at 730 nm ( A 730 ) with a spectrophotometer (Lambda 35, Perkin–Elmer, USA). Pre‐cultures of phytochrome mutants cph1 − , cph2 − , and cph1 − / cph2 − [14] were grown under the same conditions with the exception that the medium contained 40 μg/ml kanamycin, and additional 7 μg/ml chloramphenicol in the case of mutant cph1 − / cph2 − . Mutant cells were transferred into medium without antibiotics for the final cell culture used for the R and FR experiments.…”
Section: Methodsmentioning
confidence: 99%
“…Among the anoxygenic photosynthetic bacteria, bacteriophytochromes have been found to help activate a switch between photosynthetic and respiratory metabolism (13) and to regulate the production of photosynthetic systems (14) and the synthesis of light-harvesting systems to optimize light collection (15) have been found. The cyanobacterial phytochomes Cph1 and Cph2 regulate the growth rate under far-red light and red light, respectively (16), with Cph2 also inhibiting phototaxis toward blue light, suggesting a blue-light-responsive function (17, 18). Cyanobacteria also have phytochrome-like cyanobacteriochromes that regulate pigment production (19) and phototaxis (20), but these cyanobacteriochromes are distinct from phytochromes in their domain structure, their use of phycoviolobilin as a chromophore, and their red/green or blue/green photochromism (21).…”
Section: Introductionmentioning
confidence: 99%