Signal perception and amplification in photoresponses of cyanobacteria.
In addition to a number of other external stimuli, the gliding cyanobacterium, Phormidium uncinatum, uses light as a clue to control movement in order to find and stay in a microhabitat with optimal conditions for growth and survival of the population. Of the three photoresponses developed in cyanobacteria, phototaxis, photokinesis and photophobic responses, the latter are the most prominent for this task. Step-down phobic responses are mediated by the photosynthetic pigments and are linked to the linear electron-transport chain. A change in the fluence rate is reflected by a change in the proton-motive force which is amplifi.
Häder
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DP
Fachbereich Biologie-Botanik, Philipps Universität, Karl-von-Frisch-Str., D-3550 Marburg, F.R.G.