Abstract
The capacity for anoxygenic photosynthesis and other physiological traits related to sulfide tolerance were compared in several strains of the thermophilic cyanobacterium Oscillatoria amphigranulata. Strains were isolated from hot springs in which the environmental sulfide over O. amphigranulata microbial mats spanned a range from 0.2 to 1 mM. Great differences in the capacity for anoxygenic photosynthesis existed among the isolates but these correlated in a predictable manner with the sulfide content of the springs. The time required for commencement of anoxygenic photosynthesis and the degree of initial sensitivity of Photosystem II to sulfide did not correlate with environmental sulfide levels. Kinetic parameters of sulfide consumption indicate uniformly low affinities for sulfide (Km of about 1 mM) but differences among strains in Vmax.
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