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Plant Physiology 83:652-656 (1987)
© 1987 American Society of Plant Biologists

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Development and Growth Regulation

Effect of Acid Treatment of Plant Cuticles on Sorption of Selected Auxins 1

Warren E. Shafer2 and Martin J. Bukovac

Department of Horticulture, Michigan State University, East Lansing, Michigan 48824

Sorption characteristics of 2-(1-naphthyl)acetic acid (NAA), 2-(1-naphthyl)acetamide (NAAm), and 2,4-dichlorophenoxyacetic acid (2,4-D) were determined for cuticles enzymically isolated from mature tomato (Lycopersicon esculentum Mill. cv Sprinter) and pepper (Capsicum annuum L.) fruit. Sorption equilibrium for NAA and 2,4-D by tomato cuticular membranes (CM) and dewaxed cuticular membranes (DCM) was achieved within 24 hours at 25°C. The average K (partition coefficient) values for NAA in tomato CM and DCM were 166 and 204, respectively, whereas the corresponding K values for 2,4-D were 292 and 383, respectively. Sorption equilibrium for 2,4-D and NAA in pepper cuticles was not achieved after 18 and 63 days, respectively. Sorption equilibrium for NAAm in tomato and pepper CM and DCM was attained within 48 hours. Acid pretreatment (2.0 N HCl, 10 minutes) had no effect on NAA, 2,4-D, or NAAm sorption by tomato CM and DCM, or on NAAm sorption by pepper CM and DCM. Acid pretreatment of pepper CM and DCM led to slightly lower KpH (apparent partition coefficient) values for both NAA and 2,4-D. More significantly, sorption equilibrium for NAA and 2,4-D in pepper CM and DCM was achieved within 24 hours after acid treatment.

2 Present address: Abbott Laboratories, Agricultural Research Center, Oakwood Rd., Long Grove, IL 60047.

1 This paper is based on work supported, in part, by the United States Department of Agriculture under Agreement No. CWU 3607-20300-004-01 S and by a grant from the Shell Development Co., Modesto, CA 95352. Journal Article No 11990 from the Michigan Agricultural Experiment Station, East Lansing.






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Copyright © 1987 by the American Society of Plant Biologists