Summary
An ultrastructural study of cytokinesis, cell wall ontogenesis, and papilla development/form inCarteria crucifera Korsh. andChloromonas rosae Ettl was undertaken. After typical phycoplast-mediated cytokinesis, wall ontogenesis begins at the level of Golgi apparatus activation and secretion to the outside of the daughter cells of fibrillar wall precursors which self assemble into the typical chlamydomonad wall (sensuRoberts 1974). As wall ontogenesis approaches the flagellar region of the cell, several precisely timed events occur: flagellar apparatus formation, flagellar emergence, protoplasmic extension in the future papilla area underlined by series of parallel aligned microtubules, wall formation (at least the W2–W6 layers), retraction of the protoplasmic extension and loss of underlying microtubules, and final wall modification (gap filling by W1 material) to yield the characteristic wall papilla. The transient cytoplasmic extensions mimic the shape of the future wall papilla and are maintained, at least inCarteria, by underlying microtubules. Structural and developmental properties of the papilla are characterized and phylogenetic implications are discussed.
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This research was supported by National Science Foundation Grant DEB 78-0554.
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Domozych, D.S., Mattox, K.R. & Stewart, K.D. The role of microtubules during the cytokinetic events of cell wall ontogenesis and papilla development inCarteria crucifera . Protoplasma 106, 193–204 (1981). https://doi.org/10.1007/BF01275551
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DOI: https://doi.org/10.1007/BF01275551