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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 7682

Wanda Klopocka; Intracellular Factors Influencing the Direction of New Pseudopodia Produced by Amoeba proteus. Protistologica XVIII(3):389-396, 1982

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Stimulus in the form of a transversal stripe of shade may introduce the formation of lateral pseudopodia in any body region of Amoeba proteus. However, in the anterior cell part such pseudopodia are formed more easily than in the posterior regions. Pseudopodia induced in the different cell regions are extended at the different angles in respect to the longitudinal axis of amoeba. The deviation angle seems to depend on the direction and value of the forces which are exerted by endoplasmic streamings on the body wall in the place of the pseudopodium formation. The frontal zone of amoeba migrating round a dark ring regularly refines the direction of its further expansion and modifies its own configuration according to the curve of the ring. Usually it is achieved by forming a new leading pseudopodium in the shade when the old one leaves the ring and is exposed to light. All the pseudopodium which leave the ring are deviated to the centrifugal side, that is in the direction determined by the endoplasm streaming originating in more posterior body regions.