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The Effect of Auxin on Suckering in Black Locust

Published online by Cambridge University Press:  12 June 2017

John P. Sterrett  and
W. E. Chappell
John P. Sterrett
Affiliation:
Department of Plant Pathology and Physiology, Virginia Polytechnic Institute, Blacksburg, Virginia
W. E. Chappell
Affiliation:
Department of Plant Pathology and Physiology, Virginia Polytechnic Institute, Blacksburg, Virginia
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Abstract

Experiments were conducted on black locust (Robinia pseudoacacia L.) to determine the effect of auxin distribution and degradation on the formation of root suckers. Stump sprouting and root suckering occurred when black locust seedlings were decapitated, and the presence of stump sprouts prevented root suckering. The influence of stump sprouts could be replaced by applying indoleacetic acid (IAA) in lanolin paste to the cut surfaces of root stubs. These results provide additional support for an apical dominance theory of suckering. When IAA-2-C14 in lanolin was applied to the cut surfaces of root stubs, autoradiographs showed that C14 activity was concentrated where the majority of root suckers normally would develop. Apparently, IAA accumulated in this region and inhibited root suckering. When the IAA-lanolin paste was removed from the root stubs after inhibiting suckering for a month, vigorous root suckering took place. This indicated the possibility that black locust roots contain an IAA oxidase system. The existence of such a system was demonstrated by dialyzed enzyme preparations extracted from black locust roots which oxidized IAA in a Warburg apparatus.

Type
Research Article
Information
Weeds , Volume 15 , Issue 4 , October 1967 , pp. 323 - 326
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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