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Plant Physiology 53:723-727 (1974)
© 1974 American Society of Plant Biologists

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Cation Penetration through Isolated Leaf Cuticles 1

James C. McFarlanea

Wade L. Berryb

a National Environmental Research Center at Las Vegas, Las Vegas, Nevada 89114, b Los Angeles State and County Arboretum, Arcadia, California 91006

The rates of penetration of various cations through isolated apricot Prunus armeniaca L. leaf cuticles were determined. Steady state rates were measured by using a specially constructed flow-through diffusion cell. The penetration rates of the monovalent cations in group IA followed a normal lyotropic series, i.e., CS+ ≥ Rb+ > K+ > Na+ > Li+. The divalent cations all penetrated through the cuticle more slowly than the monovalent cations. Comparison of the relative values of k (permeability coefficient) and D (diffusion coefficient) indicates that the penetration of ions through isolated cuticles took place by diffusion and was impeded by charge interactions between the solute and charge sites in the penetration pathway. Cuticular penetration rates of K+ and H2O at pH above 9 were of similar magnitude. At pH 5.5 H2O penetration was not affected but that of K+ was greatly reduced. From this observation and from data on cuticle titration and ion adsorption studies, we hypothesize that cuticular pores are lined with a substance (perhaps a protein) which has exposed positively charged sites.

1 Investigation was done in the Plant Science Department at the University of California, Riverside. The Environmental Protection Agency provided financial support to J. C. McF.




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J. Schonherr
Characterization of aqueous pores in plant cuticles and permeation of ionic solutes
J. Exp. Bot., August 1, 2006; 57(11): 2471 - 2491.
[Abstract] [Full Text] [PDF]


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Copyright © 1974 by the American Society of Plant Biologists