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Studies of a Marine Grass, Thalassia testudinum. I. Ultrastructure of the Osmoregulatory Leaf Cells

Richard Jagels
American Journal of Botany
Vol. 60, No. 10 (Nov. - Dec., 1973), pp. 1003-1009
Stable URL: http://www.jstor.org/stable/2441514
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Studies of a Marine Grass, Thalassia testudinum. I. Ultrastructure of the Osmoregulatory Leaf Cells
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Abstract

Thalassia testudinum (Turtle Grass), a marine monocot which grows completely submerged, differs from intertidal and other halophytic angiosperms in that it has no specialized salt-secretory glands. Osmoregulation appears to be accomplished by the epidermal leaf cells which have highly invaginated plasmalemmas with numerous mitochondria situated in the interdigitations The ultrastructure and proposed mode of secretion are similar to that of the salt-marsh monocot Spartina, but differ from that found in dicots. Evidence is presented to show why monocots are the only angiosperms which have adapted to a completely marine environment.

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