The synthesis of the UV-screening pigment, scytonemin, and photosynthetic performance in isolates from closely related natural populations of cyanobacteria (Calothrix sp.)

Environmental Microbiology
Jesse G Dillon, R W Castenholz

Abstract

Two populations of the cyanobacterium Calothrix sp. found in Yellowstone thermal spring outflows differ greatly in their contents of scytonemin, a UV-screening pigment, and in their photosynthetic carbon assimilation rates. Clonal isolates from both populations were used to investigate these phenotypic differences. Identical partial 16S rDNA sequences ( approximately 900 bp) suggest a very close relationship between the two Calothrix populations and indicate that environmental differences may, in part, explain the field observations. The effects of native spring water on scytonemin synthesis and photosynthesis were tested during experiments using plated cells. Results show differences in the spring water environment were at least partly responsible for the differences in scytonemin content observed in the field. Furthermore, spring water effects on photosynthetic performance suggest adaptation in these strains to their spring of origin. Controlled experiments performed using cultures grown in artificial liquid medium showed no significant difference in photosynthetic carbon uptake between strains. However, significant differences were detected in their ability to synthesize scytonemin indicating genetic differences between popu...Continue Reading

References

Jul 1, 1990·Journal of Bacteriology·R DevereuxW B Whitman
Feb 1, 1966·Biochemistry·N E GoodR M Singh
Aug 1, 1997·Applied and Environmental Microbiology·U NübelG Muyzer
May 21, 2003·Environmental Microbiology·Jesse G DillonRichard W Castenholz

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Citations

Jul 7, 2007·Canadian Journal of Microbiology·Hongmei JingStephen B Pointing
Nov 12, 2015·BioMed Research International·Shiv Kumar, Jaebong Kim
Apr 9, 2005·Environmental Microbiology·Michael J Rothrock, Ferran Garcia-Pichel
Jun 12, 2013·Environmental Microbiology Reports·Mariam HamisiBirgitta Bergman
Feb 15, 2011·International Journal of Systematic and Evolutionary Microbiology·Esther BerrenderoPilar Mateo
Jun 10, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Vanessa End de OliveiraLuiz Fernando Cappa de Oliveira
Mar 9, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·D-P HäderR C Worrest
May 21, 2003·Environmental Microbiology·Jesse G DillonRichard W Castenholz
May 1, 2021·Marine Drugs·Shaden A M KhalifaHesham R El-Seedi

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