Plasma-membrane rosettes involved in localized wall thickening during xylem vessel formation of Lepidium sativum L.
- 1 January 1985
- journal article
- research article
- Published by Springer Nature in Planta
- Vol. 164 (1), 12-21
- https://doi.org/10.1007/bf00391020
Abstract
Developing xylem vessel elements in roots of cress, Lepidium sativum L., were freeze-fractured after rapid freezing in nitrogen slush (without cryoprotection). With the double-replica technique, both the plasmatic fracture face (PF) and the extraplasmatic fracture face (EF) of the plasma membrane were exposed. The EF revealed abundant, but rather indistinct “terminal globules”; whereas the PF showed numerous “rosettes”. Terminal globules and rosettes were localized, restricted to regions of secondary wall thickening only, and showed comparale frequencies per μm2, supporting the assumption that they are part of the same synthase complex. The abundance of rosettes in regions of high cellulose production supports their postulated involvement in cellulose microfibril formation. With up to 191 rosettes per μm2, the rosettes appear to be too densely arranged to be directly aligned on individual microtubules. This favors the channelling hypothesis of synthase movement in the plasma membrane.Keywords
This publication has 13 references indexed in Scilit:
- Oriented ?rosette? alignment during cellulose formation in mung bean hypocotylThe Science of Nature, 1984
- Occurrence of the putative cellulose-synthesizing ?rosettes? in the plasma membrane ofGlycine max suspension culture cellsThe Science of Nature, 1984
- Toward a Dynamic Helical Model for the Influence of Microtubules on Wall Patterns in PlantsInternational Review of Cytology, 1984
- Arrays of plasma-membrane ?rosettes? involved in cellulose microfibril formation of SpirogyraPlanta, 1983
- Cellulose-Microfibril Assembly and Orientation in Higher Plant Cells with Particular Reference to Seedlings of Zea maysPublished by Springer Nature ,1982
- Calcofluor white and Congo red inhibit chitin microfibril assembly of Poterioochromonas: evidence for a gap between polymerization and microfibril formation.The Journal of cell biology, 1980
- Visualization of particle complexes in the plasma membrane of Micrasterias denticulata associated with the formation of cellulose fibrils in primary and secondary cell walls.The Journal of cell biology, 1980
- Evidence for an intramembrane component associated with a cellulose microfibril-synthesizing complex in higher plants.The Journal of cell biology, 1980
- Cellulose microfibrils: visualization of biosynthetic and orienting complexes in association with the plasma membrane.Proceedings of the National Academy of Sciences, 1976
- A unified hypothesis for the role of membrane bound enzyme complexes and microtubules in plant cell wall synthesisJournal of Theoretical Biology, 1974