title: Preprophase band loses its function as a cytokinetic apparatus in mitosis of neck canal mother cell.
abstract: Preprophase bands in the neck canal mother cell and the central cell of the archegonium of the fern Dryopteris crassirhizoma are observed with immunofluorescence microscopy. No phragmoplast is found during mitosis of the neck canal mother cell; however, the phragmoplast develops very well in the central cell. The neck canal mother cell undergoes karyokinesis but not cytokinesis and finally produces only one binucleate neck canal cell. However, the central cell undergoes cytokinesis and produces an egg cell and a ventral canal cell. These observations suggest that the preprophase band in the neck canal mother cell loses its function as a cytokinetic apparatus and becomes an evolutionary vestige in the development of the archegonium.
authors.affiliation: College of Life Sciences, Peking University, Beijing, People's Republic of China.
authors.forename: Qun
authors.initials: Q
authors.lastname: He
authors.forename: Rui-Lin
authors.initials: RL
authors.lastname: You
authors.lastname: Sodmergen
authors.forename: Wen-Mei
authors.initials: WM
authors.lastname: Bao
mesh_terms: D002467:Cell Nucleus / Q000235:genetics / Q000648:ultrastructure; D002473:Cell Wall / Q000378:metabolism / Q000648:ultrastructure; D002478:Cells, Cultured; D002875:Chromosomes / Q000235:genetics / Q000648:ultrastructure; D032492:Dryopteris / Q000235:genetics / Q000254:growth & development* / Q000648:ultrastructure*; D005455:Fluorescent Antibody Technique; D008854:Microscopy, Electron; D008870:Microtubules / Q000235:genetics / Q000648:ultrastructure; D008938:Mitosis / Q000502:physiology*; D018514:Plant Structures / Q000235:genetics / Q000254:growth & development* / Q000648:ultrastructure*; D011418:Prophase / Q000235:genetics