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Plant Physiology 46:790-793 (1970)
© 1970 American Society of Plant Biologists

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Articles

Abscission

Movement and Conjugation of Auxin

Lyle E. Craker1, Arthur V. Chadwick2 and Gerald R. Leather

a Plant Sciences Laboratories, Fort Detrick, Frederick, Maryland 21701

A 1-hour application of indole-3-acetic acid to bean (Phaseolus vulgaris L. cv. Red Kidney) explants inhibited abscission for an 8-hour aging period. Use of indole-3-acetic acid-14C showed that the applied indole-3-acetic acid was conjugated within explant tissue and that this conjugation mechanism accounts for loss of effectiveness of indole-3-acetic acid in inhibiting abscission after 8 hours. Reapplication of indole-3-acetic acid to an explant at a later time, before the induced aging requirement was completed reinhibited abscission. 2,4-Dichlorophenoxyacetic acid, which is not destroyed or conjugated by this system, did not lose its ability to inhibit abscission. It was concluded that indole-3-acetic acid destruction is one of the processes involved in the aging stage of abscission in explants.

1 Present address: Department of Environmental Sciences, University of Massachusettes, Waltham, Massachusettes 02154.

2 Present address: Department of Biology, Loma Linda University, Loma Linda, California 92701.






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Copyright © 1970 by the American Society of Plant Biologists