ISSN:
1615-6102
Keywords:
Cell wall morphogenesis
;
Labiate process
;
Patterning
;
Silica deposition
;
Ditylum brightwellii
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The sequential wall formation in the centric diatom,Ditylum brightwellii (West) Grunow, is described. The silica deposition vesicle is formed by the coalescence of small vesicles. Silicification of the new valve starts from the central labiate process area prior to the completion of cytokinesis, and the developing valve grows in a centrifugal direction. The initiation of the structures on the valve follows the sequence: labiate process, marginal ridge, and rota. A novel “labiate process apparatus”, which is situated in the cytoplasm close to the developing labiate process, appears prior to the initiation of the labiate process and disappears upon its maturation. Segments of the girdle bands are formed in individual silica deposition vesicles after the valve matures and is exocytosed. Three morphological forms of deposited silica have been determined: thin base layers, microfibrils, and hexagonal columns. The involvement of cytoplasmic structures in the patterning of the siliceous wall is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01279720
Permalink