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The endomembrane system and mechanism of membrane flow in the green alga,Gloeomonas kupfferi (Volvocales, Chlorophyta) I. An ultrastructural analysis

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Summary

The endomembrane system of the chlamydomonad flagellate,Gloeomonas kupfferi (Chlorophyta), is complex. It consists of a proliferating ER network, a perinuclear complex of 14–18 dictyosomes and 8–12 vacuoles and an anterior contractile vacuole complex. The ER network extends from the nuclear envelope outwards, ensheafhs a dictyosome, extends out through a lobe of the chloroplast and terminates in the thin zone of peripheral cytoplasm between the chloroplast and plasmamembrane. The individual dictyosome is polar with distinct cis- and trans-faces. The cis-face is closely associated with transition vesicles emerging from the adjacent ER. Large vesicles emerge from peripheral swellings of terminal cisternae. The dictyosome-associated ER is connected to the peripheral vacuolar system. During cell division and cytokinesis, changes in the endomembrane system occur. Dictyosomes divide and quickly separate to form perinuclear complexes around the daughter nuclei. Each dictyosome undergoes morphological changes during this wall precursor-producing stage. ER lines the furrow zone and is closely associated with phycoplast microtubules. A discussion of the endomembrane system in membrane flow mechanics is provided.

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Abbreviations

ER:

endoplasmic reticulum

OsFeCN:

Osmium ferricyanide

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  1. Department of Biology, Skidmore College, Saratoga Springs, New York

    D. S. Domozych

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  1. D. S. Domozych
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Domozych, D.S. The endomembrane system and mechanism of membrane flow in the green alga,Gloeomonas kupfferi (Volvocales, Chlorophyta) I. An ultrastructural analysis. Protoplasma 149, 95–107 (1989). https://doi.org/10.1007/BF01322982

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  • DOI: https://doi.org/10.1007/BF01322982

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