Mutations affecting chromatic adaptation in the cyanobacterium Fremyella diplosiphon.

Journal of Bacteriology
John G Cobley, R D Miranda

Abstract

The chromatically adapting cyanobacterium, Fremyella diplosiphon, when grown in cool white fluorescent light, contains phycoerythrin as its predominant phycobiliprotein. When grown on agar plates with cool white illumination, mutant colonies deficient or devoid of phycoerythrin can be visibly distinguished from the wild type. A total of 25 anomalously pigmented strains were isolated and examined for their ability to chromatically adapt. Based on absorption spectra of cell extracts and on fluorescence emission spectra of intact filaments, we assigned each mutant to one of three classes. In green mutants (16 strains), the photoinduction of phycoerythrin synthesis by green light was lost or impaired, whereas the photorepression of phycocyanin synthesis by green light still functioned as in the wild type. In blue mutants (eight strains), both the ability to photoinduce phycoerythrin synthesis and the ability to photorepress phycocyanin synthesis were lost or impaired. Filaments of blue mutants exhibited a high fluorescence emission at 660 nm. A black mutant (one strain) exhibited partial induction of phycoerythrin and partial repression of phycocyanin in both red and cool white light. From the data, we suggest that in information t...Continue Reading

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Citations

Dec 1, 1986·Photochemistry and Photobiology·A R GrossmanP B Conley
Mar 30, 2001·The Journal of Biological Chemistry·A R GrossmanQ He
May 4, 2006·Annual Review of Plant Biology·David M Kehoe, Andrian Gutu
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