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Diphenamid Metabolism in Tomato: Time Course of an Ozone Fumigation Effect

Published online by Cambridge University Press:  12 June 2017

Richard H. Hodgson ,
Kendall E. Dusbabek  and
Barry L. Hoffer
Richard H. Hodgson
Affiliation:
Metabolism and Radiation Res. Lab., N. Centr. Reg., Agr. Res. Serv., U.S. Dep. of Agr., Fargo, ND 58102
Kendall E. Dusbabek
Affiliation:
Metabolism and Radiation Res. Lab., N. Centr. Reg., Agr. Res. Serv., U.S. Dep. of Agr., Fargo, ND 58102
Barry L. Hoffer
Affiliation:
Metabolism and Radiation Res. Lab., N. Centr. Reg., Agr. Res. Serv., U.S. Dep. of Agr., Fargo, ND 58102
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Abstract

The time course of diphenamid (N,N-dimethyl-2,2-diphenylacetamide) metabolism in tomato (Lycopersicon esculentum Mill. ‘Sheyenne’) was altered by fumigation with 30 pphm (parts per hundred million) of O3. After 2 days 70% of the absorbed diphenamid was metabolized in controls compared with 83% in fumigated plants. Concentrations of N-methyl-2,2-diphenylacetamide (MMDA) were equivalent in both fumigated and control plants. Less glucoside conjugate (MDAG) was present in fumigated plants 2 to 4 days after treatment than in the control plants. Gentiobioside conjugate (MDAGB) increased rapidly in fumigated plants after 0.5 day but not in control plants until after 2 days. Loss of diphenamid from aerated solution was demonstrated. A scheme for diphenamid metabolism is proposed.

Type
Research Article
Information
Weed Science , Volume 22 , Issue 3 , May 1974 , pp. 205 - 210
Copyright
Copyright © 1974 by the Weed Science Society of America 

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References

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