Plant Physiol.
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Plant Physiology 69:389-392 (1982)
© 1982 American Society of Plant Biologists

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Articles

Hormonal Control of Tobacco Crown Gall Tumor Morphology 1

Richard M. Amasino2 and Carlos O. Miller3

Department of Biology, Indiana University, Bloomington, Indiana 47405

The endogenous levels of auxin and cytokinin in teratoma and unorganized tobacco (Nicotiana tabacum L. var Wisconsin #38) crown gall tumor tissues were determined. Teratoma tissues contain levels of auxin and cytokinin favorable for shoot formation, whereas unorganized tumors contain levels of auxin that suppress shoot formation. This conclusion is based upon the observation that when levels of auxin and cytokinin similar to those found in a teratoma were added to the growth medium of nontumorous tobacco tissue, shoot formation resulted; when levels similar to those found in unorganized tumors were added, the normal tissue grew as unorganized callus.

2 Present address: Department of Microbiology and Immunology, University of Washington, Seattle, WA 98195.

3 To whom reprint requests should be sent.

1 Supported by Grants PCM80-03749 and PCM76-12306 from the National Science Foundation and represents part of the doctoral thesis of R. M. A.




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Copyright © 1982 by the American Society of Plant Biologists