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Interaction of Glyphosate with Aromatic Amino Acids on Transpiration in Phaseolus vulgaris

Published online by Cambridge University Press:  12 June 2017

D. L. Shaner  and
J. L. Lyon
D. L. Shaner
Affiliation:
Dep. Botany and Plant Sci., Univ. of California, Riverside, CA 92521
J. L. Lyon
Affiliation:
Dep. Botany and Plant Sci., Univ. of California, Riverside, CA 92521
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Abstract

When glyphosate [N-(phosphonomethyl)glycine] was fed through the transpiration stream of excised bean (Phaseolus vulgaris L. ‘Red Kidney’) shoots, it was readily absorbed and transported to the leaves where it inhibited transpiration. Maximum inhibition (40 to 50%) resulted from tissue concentrations of 50 to 3000 nmoles glyphosate/g fresh weight, while transpiration was significantly inhibited (20%) by as little as 15 nmoles/g fresh weight. A combination of 5 X 10-4M tyrosine (Tyr) and 5 x 10-4M phenylalanine (Phe) supplied continuously through the transpiration stream prevented the inhibition of transpiration by glyphosate during the course of 8-h experiments. Tyrosine (10-3M) alone delayed the transpiration response to glyphosate by 2 to 3 h but 10-3M Phe alone did not affect the inhibition by glyphosate. Levels of endogenous Tyr and Phe were about 50% lower in glyphosate-treated leaves than in the controls 6 h after treatment.

Keywords

Tryptophantyrosinephenylalanine14C-glyphosate
Type
Research Article
Information
Weed Science , Volume 28 , Issue 1 , January 1980 , pp. 31 - 35
Copyright
Copyright © 1980 by the Weed Science Society of America 

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References

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