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Journal of Cell Science, Vol 2, 465-472, Copyright © 1967 by Company of Biologists

Submitted on April 17, 1967

Cytoplasmic Streaming and Microtubules in the Coenocytic Marine Alga,Caulerpa Prolifera

D. D. SABNIS 1 and W. P. JACOBS 2

1 Biology Department, Princeton University Princeton, N.F., U.S.A.
2 Biology Department, Princeton University Princeton, N.J., U.S.A.

Two distinct patterns of cytoplasmic streaming in the leaf of Caulerpa prolifera are described. Broad, longitudinally running, two-way streams are restricted to the endoplasm of one leaf surface. Also present are large numbers of narrow, two-way streams that coil helically throughout the endoplasm surrounding the central vacuole. Numerous unique bundles of aggregated, evenly spaced, oriented microtubules are distributed within the inner cytoplasm some distance from the cell wall. Cortical microtubules, as described for other plant material, have been only very infrequently encountered in Caulerpa and appear to be sparsely distributed. Apart from the prominent bundles of oriented microtubules, no other significant ultrastructural differences were noted between the stationary ectoplasm and streaming endoplasm. The possible cyto-skeletal role of the oriented microtubules in the development and maintenance of asymmetries in organ differentiation is discussed in relation to their direct or indirect influence on the directional migration of cytoplasmic components.

Submitted on April 17, 1967






© The Company of Biologists Ltd 1967