Plant Physiol. Drug Metab Dispos
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Plant Physiology 52:663-666 (1973)
© 1973 American Society of Plant Biologists

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Articles

Fusarium tricinctum T-2 Toxin Inhibits Auxin-promoted Elongation in Soybean Hypocotyl 1

Catherine Stahla, Larry N. Vanderhoefa,2 and Ned Siegela,3

John P. Helgesonb

a Department of Botany, University of Illinois, Urbana, Illinois 61801, b Department of Plant Pathology, Pioneering Research Laboratory, Agricultural Research Service, United States Department of Agriculture, University of Wisconsin, Madison, Wisconsin 53706

T-2 toxin, a mycotoxin produced by Fusarium tricinctum, inhibited elongation of excised hypocotyl sections of Glycine max var. Hawkeye 63. Auxin-promoted elongation was inhibited more severely than was control elongation, and a 1 hour preincubation of 5 µM toxin prevented the induction of a faster rate of elongation by auxin. While the inhibition of elongation by cytokinin was similar to that of the toxin, the mode of action of the two compounds appeared to be different, i.e. their effects on elongation were additive, and only kinetin promoted radial enlargement. Toxin treatment did not diminish cytokinin-induced radial enlargement. The properties of the plasma membrane, as measured by electrolyte leakage, were not affected by the toxin.

2 To whom correspondence should be addressed.

3 Present address: Department of Agronomy, University of Illinois, Urbana, Ill. 61801.

1 This work was supported by a National Defense Education Act predoctoral fellowship to C. S., by National Science Foundation Grant GB-36586 to L.N.V., and by a Department of Health, Education and Welfare Biomedical Sciences Support Grant to the University of Illinois.






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Copyright © 1973 by the American Society of Plant Biologists