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- W2003647345 abstract "The ultrastructure of a Xanthonema strain featuring multinucleate cells was investigated by transmission electron microscopy. An important specific feature of the organisation of the photosynthetic apparatus in this strain is its association with mitochondrial profiles. The chloroplast girdle is composed of two different U-shaped lamellae, one peripheral and one subcentral. Multinuclearity is observed as often as the uninucleate state. The transition from the uninucleate to the multinucleate stage is connected to disturbances in the normal division pattern of the parietal chloroplast-mitochondria complex during interphase. As a result mitosis is not coordinated with cytokinesis. The return to the uninucleate stage occurs as a result of asynchronous cytokinesis or by aplanospore formation. Mitosis is of the semi-closed type, as in Tribonema. Centrioles replicate in early interphase, after the end of karyokinesis and progeny nuclei separate with the aid of CER invagination. Filament fragmentation takes place between neighbouring cells where two U-shaped segments adjoin, resulting in fragment ends being rounded rather than ‘zweispitzig’. The taxonomic significance of various ultrastructural features for the classification of filamentous Xanthophyta is discussed." @default.
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- W2003647345 date "2009-05-01" @default.
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- W2003647345 title "Mitosis, cytokinesis and multinuclearity in aXanthonema(Xanthophyta) isolated from Antarctica" @default.
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- W2003647345 doi "https://doi.org/10.1080/09670260802636274" @default.
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