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© 1987 Oxford University Press

RESEARCH-ARTICLE

An Experimental Analysis of the Dictyosome in the Green Alga, Tetraselmis convolutae

DAVID S. DOMOZYCH

Department of Biology, Skidmore College Saratoga Springs, N. Y. 12866 U.S.A.

Correspondence to: Department of Biology, Skidmore College, Saratoga Springs, N.Y. 12866, U.S.A.

Domozych, D. S. 1987. An experimental analysis of the dictyosome in the green alga, Tetraselmis convolutae.—J. exp. Bot. 38: 1399–1411.

Tetraselmis convolutae possesses two well-defined, polar-oriented dictyosomes. These endo-membrane components have various functions that change during the cell cycle phases. The dictyosomes are also very sensitive to various subcellular poisons. Disruption of the cellular ionic balance with monovalent ionophores yields maturing face curling, swelling and the production of unusual multivesicular elements. Divalent ionophore application also impairs maturing face vesiculation and vesicle transport in the anterior cytoplasm. Caffeine restricts maturing face vesicle production, subsequently leading to gross enlargement of cisternal length. Application of the microtubule-inhibitor, colchicine, and the MTOC-affecting agent, IPC, leads to polar axis disruption of the dictyosome and the formation of multiple, cisternal stacks. A discussion of dictyosome-microtubule-MTOC associations is presented.

Key words: Tetraselmis, dictyosome, disruption


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