The ultrastructure of meiosis in Plasmodiophora brassicae (Plasmodiophorales)

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Abstract
Meiosis was examined in plasmodia of the protist Plasmodiophora brassicae within artificially inoculated cabbage roots, using light and electron microscopy. Meiotic nuclear divisions occur following the cessation of vegetative growth of the Plasmodium. Synaptonemal complexes develop in nuclei of the “akaryote stage,” which represents prophase I. Meiosis I and II take place concurrently with cleavage of the Plasmodium into resting sporangia. Previous reports of synaptonemal complexes and sporangiogenic meiosis in the Plasmodiophorales are thus corroborated. Centrioles are paired and bipolar until the end of meiosis I; then they separate and migrate to opposite poles, without replicating, between prophase II and metaphase II. Centrioles elongate considerably between prophase I and the end of meiosis II, then appear to disintegrate as uninucleate resting sporangia are formed and are absent from mature sporangia.

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