title: Golgi secretion is not required for marking the preprophase band site in cultured tobacco cells.
abstract: The preprophase band predicts the future cell division site. However, the mechanism of how a transient preprophase band fulfils this function is unknown. We have investigated the possibility that Golgi secretion might be involved in marking the preprophase band site. Observations on living BY-2 cells labeled for microtubules and Golgi stacks indicated an increased Golgi stack frequency at the preprophase band site. However, inhibition of Golgi secretion by brefeldin A during preprophase band formation did not prevent accurate phragmoplast fusion, and subsequent cell plate formation, at the preprophase band site. The results show that Golgi secretion does not mark the preprophase band site and thus does not play an active role in determination of the cell division site.
authors.affiliation: The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA. rvd10@psu.edu
authors.forename: Ram
authors.initials: R
authors.lastname: Dixit
authors.forename: Richard
authors.initials: R
authors.lastname: Cyr
mesh_terms: D000595:Amino Acid Sequence; D020126:Brefeldin A / Q000494:pharmacology; D002460:Cell Line; D002478:Cells, Cultured; D006056:Golgi Apparatus / Q000187:drug effects / Q000378:metabolism*; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D008870:Microtubules / Q000502:physiology; D008969:Molecular Sequence Data; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics; D011418:Prophase / Q000502:physiology*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D008941:Spindle Apparatus / Q000502:physiology; D014026:Nicotiana / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D000097573:Red Fluorescent Protein
chemical_list: D020126:Brefeldin A; D008164:Luminescent Proteins; D017351:N-Acetylglucosaminyltransferases; D011993:Recombinant Fusion Proteins; D000097573:Red Fluorescent Protein; C024850:alpha-1,3-mannosyl-glycoprotein beta-1,2-N-acetylglucosaminyltransferase I