Istituto di Biofisica     
Marangoni R., Puntoni S., Favati L., Colombetti G. Phototaxis in Fabrea salina I. Action spectrum determination. In: Journal of Photochemistry and Photobiology B-Biology, vol. 23 (2-3) pp. 149 - 154. Elsevier, 1994.
Fabrea salina is a marine ciliate that shows both step-down photophobic reactions and positive phototaxis. To determine the nature of the phototaxis photoreceptor pigment we have measured the action spectrum of phototaxis of this ciliate by means of an automatic cell-tracking system developed in our laboratory. The action spectrum thus measured has two peaks, a sharper one at 420 nm and a broader band centered at about 580 nm, quite similar to the action spectrum of Paramecium bursaria, where evidence suggested the presence of a rhodopsin-like pigment. The nature of the pigment responsible for phototaxis in Fabrea salina is discussed.
DOI: 10.1016/1011-1344(94)06987-5
Subject Phototaxis
Fabrea salina
Action spectrum

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