Plant Physiol.
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Plant Physiology 53:164-166 (1974)
© 1974 American Society of Plant Biologists

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Articles

Mechanism of Indole-3-acetic Acid Conjugation

No Induction by Ethylene 1

Raphael Goren2, Martin J. Bukovac and James A. Flore

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

Formation of indole-3-acetic acid-aspartate in detached primary leaves of cowpea (Vigna sinensis Endl.) floating on 14C-indole-3-acetic acid (3 µc; 3.15 µM, phosphate-citrate buffer, pH 4.75), almost doubled when leaves were pretreated with 31.5 µM12C-indole-3-acetic acid for 17 hr and then transferred to 14C-indole-3-acetic acid for 4 hours as compared with leaves preincubated in buffer only. When leaves were preincubated with ethylene (11.0 and 104 µl/l) instead of 12C-indole-3-acetic acid, no induction of indole-3-acetylaspartic acid formation was observed, and the rate of indole-3-acetylaspartic acid formation decreased as compared with control leaves. Rhizobitoxine (1.87 µM) inhibited indole-3-acetic acid-induced ethylene production but did not prevent the formation of indole-3-acetylaspartic acid. In view of the similarity of these results and those previously obtained with {alpha}-naphthaleneacetic acid, it is concluded that ethylene has no role in the auxin-induced indole-3-acetylaspartic acid formation in cowpea leaves.

2 On Sabbatical leave from the Hebrew University of Jerusalem, Rehovot, Israel (1971-72).

1 This study was supported by Public Health Service Grant CC 00246 from the National Communicable Disease Center, Atlanta, Georgia, and Food and Drug Administration Grant FD 00223. Michigan Agricultural Experiment Station Journal Article No. 6385.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1974 by the American Society of Plant Biologists