Abstract
The effects of light quality (color) on the 14CO2 fixation rates of natural population of photosynthetic sulfur bacteria were tested. The phototrophic bacteria were collected from the sulfide containing waters of 3 stratified lakes. The populations sampled survive in environments where light intensities are very low. Not only are the light intensities low but, due to the “light filtering” characteristics of the lake water, the light is of specific color. It was determined that the spectral properties of the three lakes differed, hence the quality of light reaching the phototrophic bacteria in each lake differed. It was also observed that only green sulfur bacteria were present in the study lake which transmits mainly red light and both purple and green sulfur bacteria were present in the two study lakes which transmit predominantly green light. Enrichment cultures were set up with phototrophic bacteria from two of the lakes serving as the inocula. Enrichment culture studies and photosynthetic responses of the natural populations indicate that light quality is a major factor in determining the composition of phototrophic bacterial population in some lakes.
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Abbreviations
- Bchl:
-
Bacteriochlorophyll
- DPM:
-
Disintegrations per minute
References
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Parkin, T.B., Brock, T.D. The effects of light quality on the growth of phototrophic bacteria in lakes. Arch. Microbiol. 125, 19–27 (1980). https://doi.org/10.1007/BF00403193
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DOI: https://doi.org/10.1007/BF00403193