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Meiosis, spindle pole body cycle, and taxonomy of the heterobasidiomycetePachnocybe ferruginea

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Abstract

Meiosis and the meiotic spindle pole body cycle were studied electron microscopically in basidia of the heterobasidiomycetePachnocybe ferruginea. Spindle pole body splitting in prometaphase I and II, and intermeiotic and postmeiotic duplication were investigated in particular detail. During prophase, the spindle pole body consists of two three-layered discs connected by a middle piece. At late prophase I and again in prometaphase II, the discs contact the nuclear envelope. Then, the nuclear membrane at the contact area is separated from the non-contacted part of the nuclear envelope and finally disappears. Each disc nests into the nuclear opening of the otherwise intact nuclear envelope. The disc remains in the gap and generates a half spindle. At late metaphase I, a co-disc develops eccentrically within the parent disc. The co-disc detaches from the parent disc during interphase I and becomes one of the metaphase II spindle pole bodies. Co-discs are absent during the second division. A cap of endoplasmic reticulum encloses each disc during prophase I through anaphase I. In the second meiotic division, the caps covering the spindle pole bodies of one nucleus of the pair, are developed from the neighbouring nucleus. Spindle pole bodies ofP. ferruginea are similar to those of the rusts, and especially to those ofEocronartium muscicola andHelicobasidium mompa.

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  1. Institut für Biologie I, Lehrstuhl für Spezielle Botanik, Universität Tübingen, Auf der Morgenstelle 1, D-7400, Tübingen, Germany

    R. Bauer & F. Oberwinkler

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  1. R. Bauer
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  2. F. Oberwinkler
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Part 73 of the series “Studies inHeterobasidiomycetes”.

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Bauer, R., Oberwinkler, F. Meiosis, spindle pole body cycle, and taxonomy of the heterobasidiomycetePachnocybe ferruginea . Pl Syst Evol 172, 241–261 (1990). https://doi.org/10.1007/BF00937810

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  • DOI: https://doi.org/10.1007/BF00937810

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