Plant Physiol. Drug Metab Dispos
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Plant Physiology 80:790-791 (1986)
© 1986 American Society of Plant Biologists

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Articles

Effects of Dimethyl Sulfoxide and pH on Indoleacetic Acid-Induced Lateral Root Formation in the Radish Seedling Root 1

Lawrence M. Blakely, Ruth M. Blakely and Cynthia M. Galloway2

Biological Sciences Department, California State Polytechnic University, Pomona, California 91768

Segments (2.5 cm) cut from 3-day-old seedling roots of radish (Raphanus sativus L. `Scarlet Globe') were cultured in medium with or without indoleacetic acid (IAA). Lateral root primordia frequency, determined for the central centimeter of segments, was dependent on IAA concentration and on conditions affecting IAA uptake. Dimethyl sulfoxide treatment, or a relatively low medium pH, greatly enhanced the response to exogenous IAA. It was concluded that a permeation barrier exists between the external medium and the hormone responsive sites within the radish seedling root.

2 Present address: Botany and Plant Sciences Department, University of California, Riverside, CA 92521.

1 Supported in part by a grant (project no. 3-50353) from the California Polytechnic University Kellogg Unit Foundation, Inc.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1986 by the American Society of Plant Biologists