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

AUTOR(ES)

Shafer, Warren E.

RESUMO

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.

Documentos Relacionados

• Studies on Octylphenoxy Surfactants 1: III. Sorption of Triton X-100 by Isolated Tomato Fruit Cuticles
• Effect of Cations on Effective Permeability of Leaf Cuticles to Sulfuric Acid.
• Low Proton Conductance of Plant Cuticles and Its Relevance to the Acid-Growth Theory 1
• Ethylene Production by Plant Cell Cultures: The Effect of Auxins, Abscisic Acid, and Kinetin on Ethylene Production in Suspension Cultures of Rose and Ruta Cells 1
• AN EFFECT OF AUXINS ON THE HEAT COAGULABILITY OF THE PROTEINS OF GROWING PLANT CELLS*