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Plant and Cell Physiology, 1985, Vol. 26, No. 7 1411-1417
© 1985

Article

Role of Calcium in Phototaxis of Physarum polycephalum

Donat Häder

Fachbereich Biologie, Universität Marburg Lahnberge, D-3550 Marburg, Federal Republic of West Germany

The calcium transport blockers, ruthenium red and lanthanum ions, inhibit negative phototactic orientation in the acellular slime mold, Physarum polycephalum. Likewise, agents known to enhance calcium fluxes (caffeine and phosphatidic acid) affect photo-orientation as well as trimethyl-phenyl-phosphonium$ which impairs electrochemical gradients across membranes. The results suggest that calcium fluxes are involved in the sensory transduction of phototactic orientation in this organism. The cation transport through the channels occurs passively along a previously established gradient built by energy dependent calcium pumps. Inhibition of these pumps by poly-L-lysine also impairs phototactic orientation. The location of the calcium transport phenomena is discussed.

(Received April 17, 1985; Accepted August 12, 1985)
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