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Formation Of Centriole And Centriole-Like Structures During Meiosis And Mitosis In Labyrinthula Sp. (Rhizopodea, Labyrinthulida) - An Electron Microscope Study, Frank O. Perkins
Formation Of Centriole And Centriole-Like Structures During Meiosis And Mitosis In Labyrinthula Sp. (Rhizopodea, Labyrinthulida) - An Electron Microscope Study, Frank O. Perkins
VIMS Articles
The fine structure of mitosis in vegetative cells of the marine protist Labyrinthida was found to involve formation of two approximately spherical, electron-dense aggregates (termed protocentrioles) 200-300 nm in diameter. Spindle microtubules were directly attached to the structures. The aggregates contained centrally located cartwheel structures but no microtubular elements in the form of a centriole-like cylinder. In non-sporulating cells the aggregates occurred only during mitosis or possibly in late interphase cells. During meiotic zoosporulation de novo centriole formation was observed. Vegetative spindle cells, which contained no centrioles, procentrioles, or centriolar plaques, aggregated then changed into approximately round or oval presporangia …