Abstract
Oscillatoria limnetica can use either water or sulfide as electron donor for photosynthesis, a property which they share with some other cyanobacteria (for reviews see [1,2]). The use of sulfide implies an anaerobic mode of growth in which photosystem II is bypassed and electrons are fed into the electron transport chain at the level of plastoquinone [3]. Sulfide-linked electron transport does not take off immediately; it requires an “induction phase” after the addition of sulfide. During this phase (a) protein(s) essential for anaerobic photosynthesis is (are) synthesized [4,5]. The nature of this (these) protein(s) is not clear; e.g. one might think of an electron transport component or of a protein that transports sulfide (or its oxidation product, sulfur) across the plasma membrane. To solve this problem, we are working with thylakoid preparations from 0. limnetica<; such preparations so far have been difficult to obtain.
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