Ultrastructure of developing basidiospores in <Emphasis Type="Italic">Rhizopogon roseolus</Emphasis> (= <Emphasis Type="Italic">R. rubescens</Emphasis>) |
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Authors: | Norihiro Shimomura Tadanori Aimi Teruyuki Matsumoto Nitaro Maekawa Hiroshi Otani |
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Institution: | (1) Faculty of Agriculture, Tottori University, Koyama, Tottori 680-8553, Japan |
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Abstract: | The ultrastructure of developing basidiospores in Rhizopogon roseolus is described. When viewed in the fruiting body chamber using scanning electron microscopy, basidiospores appear narrowly
ellipsoid and have smooth walls. Eight basidiospores are usually produced on the apex of each sterigma on the basidium. Transmission
electron micrographs showed that basidiospores formed by movement of cytoplasm (including the nuclei) via the sterigmata,
and then each basidiospore eventually became separated from its sterigma by an electron-lucent septum. The sterigma and basidium
subsequently collapsed, resulting in spore release. Freshly released spores retained the sterigmal appendage connected to
the collapsed basidium. After spore release, the major ultrastructural changes in the spore concerned the lipid bodies and
the spore wall. During maturation, lipid bodies formed and then expanded. Before release, the spore wall was homogeneous and
electronlucent, but after release the spore wall comprised two distinct layers with electron-dense depositions at the inner
wall, and the dense depositions formed an electron-dense third layer. The mature spore wall complex comprised at least four
distinct layers: the outer electron-lucent thin double layers, the mottled electron-dense third layer, and the electron-lucent
fourth layer in which electron-lucent granular substances were dispersed. |
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Keywords: | Ectomycorrhizal fungi Lipid body Rhizopogon roseolus Spore development Spore wall |
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