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Dynamics of the microtubular cytoskeleton in the green alga aphanochaete magna chlorophyta ii. the cortical cytoskeleton astral microtubules and spindle during the division cycle


Dynamics of the microtubular cytoskeleton in the green alga aphanochaete magna chlorophyta ii. the cortical cytoskeleton astral microtubules and spindle during the division cycle



Canadian Journal of Botany 67(1): 239-246



ISSN/ISBN: 0008-4026

DOI: 10.1139/b89-033

The organization and ontogeny of microtubular structures associated with cell division in the green alga Aphanochaete magna have been analyzed using indirect immunofluorescence and transmission electron microscopy. The cortical cytoskeleton lining the longitudinal cell walls in dividing apical and side branch initiating cells depolymerizes at prophase, has completely disappeared at anaphase, and starts to repolymerize in the apex of the cell at the transition of mitosis and cytokinesis. At prophase, astral microtubule systems develop from the nuclear pole associated centriole complexes, and the nucleus becomes ensheathed by centriole-interconnecting astral microtubules. The asters disappear at metaphase.sbd.anaphase, reappear at telophase, and finally depolymerize at posttelophase. A star-shaped phycoplast develops at telophase, transforms into a planar array at posttelophase, and becomes associated with the new cross wall, while the corticla cytoskeleton lining the longitudinal cell walls reforms (resulting in the coexistence of two wall-lining microtubule assemblages having different origins). Finally, the phycoplast microtubules depolymerize. The presence of astral microtubule systems at prophase in green algae is discussed and the behaviour of the cortical cytoskeleton at cell division is compared with that in other plant cell systems.

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Accession: 007233136

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