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Plant Physiology 49:615-618 (1972)
© 1972 American Society of Plant Biologists

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Articles

Effect of pH on Penetration of Naphthaleneacetic Acid and Naphthaleneacetamide Through Isolated Pear Leaf Cuticle 1

Robert F. Norris2 and Martin J. Bukovac

a Department of Horticulture, Michigan State University, East Lansing, Michigan 48823

Penetration of naphthaleneacetic acid through enzymatically isolated upper pear (Pyrus communis L. cv. Bartlett) leaf cuticle increased as the donor pH was decreased. Naphthaleneacetamide penetration was not influenced by donor pH. The effect of pH on naphthaleneacetic acid penetration was reversible. Higher receiver (simulated leaf interior) pH favored penetration of naphthaleneacetic acid. Changes in the degree of dissociation, and hence polarity, as controlled by hydrogen ion concentration was the prime factor in the response of naphthaleneacetic acid to pH. At pH values lower than the pK (4.2 for naphthaleneacetic acid), the molecule was primarily undissociated, lipophilic, and penetrated into the cuticle; whereas, at pH values above the pK naphthaleneacetic acid was ionized, hydrophilic, and penetrated the cuticle with difficulty or not at all. Data presented are consistent with the hypothesis that naphthaleneacetic acid and naphthaleneacetamide penetration through the cuticle takes place by diffusion.

2 Present address: Department of Botany, University of California, Davis, Calif. 95616.

1 This study was supported by Public Health Service Grant CC 00246 from the National Communicable Disease Center, Atlanta, Ga., and Food and Drug Administration Grant FD 00223. Michigan Agricultural Experiment Station Journal Article No. 5546.






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Copyright © 1972 by the American Society of Plant Biologists