ISSN:
1432-2048
Keywords:
Avicennia (salt gland)
;
Eccrine mechanism
;
Endoplasmic reticulum
;
Halophyte
;
Salt gland (ultrastructure)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Each salt-excreting gland of the mangrove Avicennia marina (Forsskål) Vierh. consists of two to four collecting cells, one stalk cell, and eight to twelve excretory cells. Differential membrane staining by zinc iodide-osmium tetroxide (as a post-fixative) or phosphotungstic acid (as a section-stain) was used to characterise the ultrastructure of the glands. A large amount of tubular endoplasmic reticulum was found in the stalk and excretory cells of the gland, but not in the collecting cells. The ultrastructural arrangement of the endoplasmic reticulum indicates that salt is loaded from the apoplasm into the endoplasmic reticulum of the symplasm at the base of the stalk cell, traverses both cell types in the endoplasmic reticulum, and is excreted at the outer edge of the gland by an eccrine-type mechanism. Increasing development of the tubular endoplasmic reticulum accompanied differentiation of the gland cells.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00394585
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