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Biol Bull 166: 156-166. (February 1984)
© 1984 Marine Biological Laboratory
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INACTIVATION OF CELL MOVEMENT FOLLOWING SEXUAL CELL RECOGNITION IN PARAMECIUM CAUDATUM

AKIO KITAMURA 1 and KOICHI HIWATASHI 1

1 Biological Institute, Tohoku University, Aoba-yama, Sendai 980, Japan

A positive correlation between sexual cell recognition and decrease in swimming velocity was studied in the ciliated protozoan, Paramecium caudatum. Ciliary membrane vesicles with conjugation-inducing activity rapidly decreased swimming velocity of living cells of the opposite mating type. Immobilization of the ventral cilia and perturbation of metachronal waves in the dorsal cilia were observed upon application of the membrane vesicles. Anterior shift of the beating direction and decrease in the beating angle or amplitude were also observed in the cells reacting to the vesicles. A similar change of swimming behavior and ciliary inactivation was seen in the chemical induction of conjugation. A possible regulatory mechanism of ciliary movement is discussed.

Submitted on November 14, 1983
Accepted on November 22, 1983






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