Redistribution of Golgi Stacks and Other Organelles during Mitosis and Cytokinesis in Plant Cells

• Published in: Plant physiology (Bethesda) 2000-09, Vol.124 (1), p.135-151
• Main Authors: Nebenführ, Andreas, Jennifer A. Frohlick, Staehelin, L. Andrew
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Cell Biology and Signal Transduction; Cell Division; Cell kinetics; Cell Line; Cell lines; Cell physiology; Cytogenetics; Cytokinesis; Cytoplasm; Cytoskeleton - metabolism; Cytoskeleton - ultrastructure; Daughter cells; Endoplasmic Reticulum, Smooth - metabolism; Endoplasmic Reticulum, Smooth - ultrastructure; Fluorescent Antibody Technique; Fundamental and applied biological sciences. Psychology; Generalities. Genetics. Plant material; Genetics and breeding of economic plants; Golgi Apparatus - metabolism; Golgi Apparatus - ultrastructure; Green Fluorescent Proteins; Luminescent Proteins - metabolism; Metaphase; Microscopy, Fluorescence; Mitochondria; Mitosis; Mitotic spindle apparatus; Nicotiana - cytology; Nicotiana - metabolism; Nicotiana - ultrastructure; Organelles; Organelles - metabolism; Organelles - ultrastructure; Plant cells; Plant physiology and development; Plants, Toxic; Soybeans
• ISSN: 0032-0889; 1532-2548
• DOI: 10.1104/pp.124.1.135

We have followed the redistribution of Golgi stacks during mitosis and cytokinesis in living tobacco BY-2 suspension culture cells by means of a green fluorescent protein-tagged soybean α-1,2 mannosidase, and correlated the findings to cytoskeletal rearrangements and to the redistribution of endoplasmic reticulum, mitochondria, and plastids. In preparation for cell division, when the general streaming of Golgi stacks stops, about one-third of the peripheral Golgi stacks redistributes to the perinuclear cytoplasm, the phragmosome, thereby reversing the ratio of interior to cortical Golgi from 2:3 to 3:2. During metaphase, approximately 20% of all Golgi stacks aggregate in the immediate vicinity of the mitotic spindle and a similar number becomes concentrated in an equatorial region under the plasma membrane. This latter localization, the "Golgi belt," accurately predicts the future site of cell division, and thus forms a novel marker for this region after the disassembly of the preprophase band. During telophase and cytokinesis, many Golgi stacks redistribute around the phragmoplast where the cell plate is formed. At the end of cytokinesis, the daughter cells have very similar Golgi stack densities. The sites of preferential Golgi stack localization are specific for this organelle and largely exclude mitochondria and plastids, although some mitochondria can approach the phragmoplast. This segregation of organelles is first observed in metaphase and persists until completion of cytokinesis. Maintenance of the distinct localizations does not depend on intact actin filaments or microtubules, although the mitotic spindle appears to play a major role in organizing the organelle distribution patterns. The redistribution of Golgi stacks during mitosis and cytokinesis is consistent with the hypothesis that Golgi stacks are repositioned to ensure equal partitioning between daughter cells as well as rapid cell plate assembly.