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The Decarboxylation of Phenoxyacetic Acid Herbicides by Excised Leaves of Woody Plants

Published online by Cambridge University Press:  12 June 2017

Eddie Basler
Eddie Basler*
Affiliation:
Department of Botany and Plant Pathology, Oklahoma Agr. Exp. Sta., Stillwater, Oklahoma
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Abstract

The rates of decarboxylation of 2,4-dichlorophenoxyacetic acid (2,4-D), 2-chloro-4-fluorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) in excised leaves of blackjack oak (Quercus marilandica Muenchh,) were determined by collecting the C14O2 evolved from carboxyl-labeled herbicides. 2,4,5-T was decarboxylated only in trace amounts. 2,4-D was decarboxylated to a maximum of about 1 per cent and 2-chloro-4-fluorophenoxyacetic acid of about 7 per cent, of the amounts taken up by the leaf. Decarboxylation rates for 2,4-D in June were highest in persimmon (Diospryos virginiana L.) and blackjack oak, and were very low in winged elm (Ulmus alata Michx.), sweet gum (Liquidambar styraciflua L.), and green ash (Fraxinus pennsylvanica Marsh.). The rates of decarboxylation of 2,4-D apparently were not correlated with susceptibility to 2,4-D.

Type
Research Article
Information
Weeds , Volume 12 , Issue 1 , January 1964 , pp. 14 - 16
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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