Chloroflexus aurantiacus and ultraviolet radiation: Implications for archean shallow-water stromatolites

Details Chloroflexus aurantiacus and ultraviolet radiation: Implications for archean shallow-water stromatolites Chloroflexus aurantiacus and ultraviolet radiation: Implications for archean shallow-water stromatolites

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993oleb...23..243p&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 23, Issue 4, pp.243-260

Physics

10

Scientific paper

The phototrophic growth ofChloroflexus aurantiacus under anoxic conditions was determined as a function of continuous UV irradiance. Cultures grown under an irradiance of 0.01 Wm-2 exhibited a slightly depressed yield over the nonirradiated control. Yields decreased further with increasing irradiance. Inhibition was severe at an irradiance of 0.66 Wm-2. Growth ofE. coli cultures was severely depressed at UV-C irradiances that permitted good growth ofC. aurantiacus. Low levels of Fe3+ provided a very effective UV absorbing screen. The apparent UV resistance ofChloroflexus and the effectiveness of iron as a UV-absorbing screen in sediments and microbial mats are suggested to be likely mechanisms of survival of early phototrophs in the Precambrian in the absence of an ozone shield.

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