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KMID : 0379119960240010001
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Korean Journal of Mycology
1996 Volume.24 No. 1 p.1 ~ p.7
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Ultrastructural Aspects of Nuclear Behaviors of Pleurotus ostreatus
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Abstract
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Premitotic, mitotic and postmitotic nuclei in the dikaryotic somatic hyphae of Pleurotus oslreatus, the oyster mushroom fungus were ultrastucturelly examined using chemical flxation and freeze-substitution process, and the behaviors of astral microtubules associated with these nuclei were closely analyzed. Electron microscopic examinations revealed that astral microtubules are significantly abundant when the nuclei are in the stage of migration and at the stage of migration, the separation of spindle pole body occurs. Such an abundancy of astral microtubules in premitotic migrating nuclei is well contrasted with mitotic and postmlitotic nuclei with much fewer astral microbuies and it should be noted that neither of these latter classes of nuclei exhibits the separation of the spindle pole body. It is remarkable that the postmitotic nuclei that are believed to migrate actively are associated with the astral microtubules that are less in cambers and length. During all the stages of nuclear division, astral microtubules are invariably radiating from the spindle pole bodies and nucleolus remains within the nuclear envelope of dividing nuclei throughout the division. The functions of astral microtubules developed daring th nuclear division as well as the nuclear migration and separation of the spindle pole body were closely examined.
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