Summary
There is no significant change in Ca++ efflux rate from plasmodia during chemotactic responses to several sugars, whereas substantially increased Ca++ efflux caused by EDTA does not significantly affect movement. Evidently the Ca++ fluxes controlling movement take place inside the organism, and chemotaxis probably involves a second messenger.
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Ludlow, C.T., Durham, A.C.H. Calcium ion fluxes across the external surface ofPhysarum polycephalum . Protoplasma 91, 107–113 (1977). https://doi.org/10.1007/BF01276726
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DOI: https://doi.org/10.1007/BF01276726