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. 1972 Nov;55(2):368-89.
doi: 10.1083/jcb.55.2.368.

Ultrastructure and time course of mitosis in the fungus Fusarium oxysporum

J R Aist, P H Williams

Ultrastructure and time course of mitosis in the fungus Fusarium oxysporum

J R Aist et al. J Cell Biol. 1972 Nov.

Abstract

Mitosis in Fusarium oxysporum Schlect. was studied by light and electron microscopy. The average times required for the stages of mitosis, as determined from measurements made on living nuclei, were as follows: prophase, 70 sec; metaphase, 120 sec; anaphase, 13 sec; and telophase, 125 sec, for a total of 5.5 min. New postfixation procedures were developed specifically to preserve the fine-structure of the mitotic apparatus. Electron microscopy of mitotic nuclei revealed a fibrillo-granular, extranuclear Spindle Pole Body (SPB) at each pole of the intranuclear, microtubular spindles. Metaphase chromosomes were attached to spindle microtubules via kinetochores, which were found near the spindle poles at telophase. The still-intact, original nuclear envelope constricted around the incipient daughter nuclei during telophase.

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