Structural Aspects of the Salt Glands of the Plumbaginaceae

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Abstract
Faraday, C. D. and Thomson, W. W. 1986. Structural aspects of the salt glands of the Plumbaginaceae.—J. exp. Bot. 37: 461–470. The epidermal salt-secreting glands of 11 species from six different genera within the Plumbaginaceae were examined Gland ultrastructure was considered with respect to species, secretory activity, and secretory product. All mature glands had a similar ultrastructure. Cytoplasmically dense secretory cells contained a full complement of organelles and structures which included numerous mitochondria and few plastids. Reconstruction of serial paradermal sections through entire glands revealed that each gland cell generally contained one or two vacuoles with a convoluted tonoplast in both secreting and non-secreting states. The absence of numerous vacuoles and vesicles during secretory activity suggested that ion secretion was by a transmembrane pathway rather than by a vesicle-mediated pathway.

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