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Water permeability of isolated cuticular membranes: The effect of cuticular waxes on diffusion of water by J. Schönherr is a Agricultural and Biological Sciences article available to read on EtoBox.

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The water permeability of astomatous cuticular membranes isolated from Citrus aurantium L. leaves, pear (Pyrus communis L.) leaves and onion (Allium cepa L.) bulb scales was determined before and after extraction of cuticular waxes with lipid solvents. In pear, the permeability coefficients for diffusion of tritiated water across cuticular membranes (CM) prior to extraction [Pd(CM)] decreased by a factor of four during leaf expansion. In all three species investigated Pd(CM) values of cuticular membranes from fully expanded leaves varied between 1 to 2 x l 0 -~c m -3 s -l . P d ( C M ) values were not affected by pH. Extraction of cuticular waxes from the membranes increased their water permeability by a factor of 300 to 500. Permeability coefficients for diffusion of THO across the cutin matrix (MX) after extraction [Pe(MX)] increased with increasing pH. P~ values were not inversely proportional to the thickness of cuticular membranes. By treating the cutin matrix and cuticular waxes as two resistances acting in series it was shown that the water permeability of cuticles is completely determined by the waxes. The lack of the Pa(CM) values to respond to pH appeared to be due to str

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Author

J. Schönherr

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1976

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)