Abstract
A spontaneous variant incapable of anoxygenic photosynthesis was derived from a fully competent strain of Oscillatoria amphigramulata which was originally isolated from a high sulfide-containing hot spring of New Zealand. Although the variant (Oa-2) acquired a slight ability to photosynthesize in the presence of 0.3–0.4 mM sulfide, this was only after a 24 h exposure to sulfide and represented oxygenic photosynthesis only. Unlike the parent strain, the incompetent variant never grew in the presence of sulfide >0.05 mM, nor was there any relief of the inhibition by DCMU [3-(3,4-dichlorophenyl)-1,1-dimethylurea] of CO2 photoincorporation when sulfide was present. The variant strain has retained all of these characteristics over a 4 year period with monthyl transfers in non-sulfide medium. The wild type, under identical conditions, has retained all of its competence with respect to sulfide.
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Abbreviations
- DCMU:
-
3-(3,4-dichlorophenyl)-1,1-dimethylurea
References
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Castenholz, R.W., Utkilen, H.C. Loss of sulfide adaptation ability in a thermophilic Oscillatoria . Arch. Microbiol. 138, 306–309 (1984). https://doi.org/10.1007/BF00410895
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DOI: https://doi.org/10.1007/BF00410895