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KMID : 0368419870300040225
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Journal of Plant Biology
1987 Volume.30 No. 4 p.225 ~ p.247
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Meiosis and Postmeiotic Mitosis in Boletus rubinellus
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Yoon Kwon-S.
David J. McLaughlin
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Abstract
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Meiosis and postmeiotic mitosis in Boletus rubinellus were examined ultrastructurally. Meiosis occurred at the apex of the basidium. A sausage-shaped spindle pole body(SPB) was observed along with the presence of synaptonemal complexes during pachytene and a diglobular SPB was present on late pachytene or diplotene nuclei. During metaphase Ⅰ, the monoglobular SPB at the spindle pole was surrounded by a membrane and the nuclear envelope was discontinuous. At anaphase Ⅰ, the chromosomes became better defined and formed a central spindle. The nucleolus was extruded from the nucleus. During anaphase Ⅰ, the SPB was excluded from the chromosomal region by a membrane and both poles were fully separated to opposite sides of the basidial wall. In meiosis Ⅱ, the two nuclei divided synchronously and the spindles were parallel. The spindles were smaller than in meiosis Ⅰ, while the SPB was approximately the same size as that of the similar stage in meiosis Ⅰ. During anaphasetelophase Ⅱ, the SPB was surrounded by a cap of endoplasmic reticulum(ER) that delimited it from the spindle. The postmeiotic interphase nuclei migrated to the mid-region of the basidium before migration to the spores. The SPB at this stage was diglobular. A postmeiotic mitosis occurred within the basidiospore, and the plane of the spindle was oblique to the long axis of the spore. The spindle and SPB were smaller than at meiosis Ⅰ and there were fewer nonchromosomal microtubules. At anaphase, the nucleolus was present inside the nuclear envelope but lateral to the spindle.
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