Ca2+-Dependent Photoreceptor Potential in Paramecium Bursaria | Zendy

Yasuo Nakaoka | Zendy; Kohsaku Kinugawa | Zendy; Tohru Kurotani | Zendy

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Ca2+-Dependent Photoreceptor Potential in Paramecium Bursaria

Author(s) -

Yasuo Nakaoka,

Kohsaku Kinugawa,

Tohru Kurotani

Publication year - 1987

Publication title -

journal of experimental biology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.367

H-Index - 185

eISSN - 1477-9145

pISSN - 0022-0949

DOI - 10.1242/jeb.131.1.107

Subject(s) - membrane potential , receptor potential , depolarization , biophysics , photostimulation , paramecium , reversal potential , conductance , biology , chemistry , receptor , physics , biochemistry , patch clamp , condensed matter physics

Photostimulation of deciliated specimens of chlorella-free P. bursaria elicited a transient depolarization of the membrane potential. The amplitude of this receptor potential became larger as light intensity was increased and the relationship showed a Michaelis equation. The action spectrum of the receptor potential showed two peaks at around 420 and 560 nm. When constant current was injected to depolarize the membrane gradually, the receptor potential showed a decrease in amplitude. The potential at which the response disappeared depended on the external concentration of Ca2+ (27mV/log [Ca2+]o), and the amplitude of the receptor potential was also dependent upon external Ca2+ concentration. Therefore, the receptor potential is primarily caused by a transient increase in the membrane conductance to Ca2+.

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