Istituto di Biofisica     
Puntoni S., Marangoni R., Gioffrè D., Colombetti G. Effects of Ca2+ and K+ on motility and photomotility of the marine ciliate Fabrea salina. In: Journal of Photochemistry and Photobiology B-Biology, vol. 43 (3) pp. 204 - 208. Elsevier, 1998.
Fabrea salina is a motile ciliate marine protozoan belonging to the order Heterotrichida that shows photomotile reactions. We report here the results of a study on motility and phototaxis of F. salina exposed to different Ca2+ and K+ concentrations. Our findings show that concentrations of potassium ions greater than that of the growth medium and concentrations of calcium ions lower than that of the growth medium cause a significant increase in phototactic response, while the cell speed is not significantly affected. A more thorough analysis shows that the absolute concentrations of Ca2+ or K+ are not important and that the phototactic responsiveness depends mainly on the ratio of the K+ concentration to the square root of the Ca2+ (the so-called Ja value), in agreement with the results obtained in other protozoa. Our results are tentatively discussed in terms of altered membrane potential or ion channel conductances.
DOI: 10.1016/S1011-1344(98)00109-2
Subject Fabrea salina
Photomovement; Ca2+

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