Dichloroacetamide herbicide antidotes enhance sulfate metabolism in corn roots

Adams, C.A. and Blee, E. and Casida, J.E. (1983) Dichloroacetamide herbicide antidotes enhance sulfate metabolism in corn roots. Pesticide Biochemistry and Physiology, 19 (3). pp. 350-360.

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Abstract

The herbicide antidotes N,N-diallyl-2,2-dichloroacetamide (R-25788) and 3-dichloroacetyl-2,2,5-trimethyloxazolidine (R-29148) at p.p.m. levels slightly enhanced the uptake of 35S-sulphate in maize roots and greatly increased its metabolism to 'bound sulphide', cysteine and glutathione (GSH). The decrease in free sulphate content of the roots with R-25788 was closely associated with an increase in GSH level. The sulphate content was decreased with an 8-h exposure to R-25788 and R-29148 at 3 p.p.m. and its decline continued for 38 h to about 5% of the control level. Effects on sulphate content were evident at 24 h even with 0.3-1 p.p.m. of these antidotes. Several other mono- or dichloroacetamide antidotes at 30 p.p.m. also decreased the free sulphate content of maize roots to about 34-60% of control levels within 24 h. R-25788 at 30 p.p.m. had little or no effect at 4 h on sulphate levels in maize leaves, whether the plants were grown in the light or in the dark. R-25788 and R-29148 decreased sulphate levels in the leaves of milo and in whole Amaranthus retroflexus plants, but not in barley, Chenopodium album, Echinochloa crus-galli, wheat or Amaranthus retroflexus. In increasing GSH biosynthesis, the antidote acted in maize prior to the reduction step to form bound sulphate; in fact, R-25788 increased the specific activity of ATP sulphurylase, the first enzyme involved in sulphate assimilation. Dichloroacetamides such as R-25788 and R-29148 thus provide a means of experimental and perhaps even practical manipulation of sulphate utilization in maize and some other spp.

Item Type: Article
Author Affiliation: California University, Berkeley, CA 94720, USA
Subjects: Plant Protection > Pesticides
Plant Protection > Pests
Plant Physiology and Biochemistry > Plant Physiology
Social Sciences > Plant Physiology and Biochemistry > Plant Physiology

Plant Physiology and Biochemistry > Biochemistry
Social Sciences > Plant Physiology and Biochemistry > Biochemistry
Divisions: Maize
Depositing User: Ms K Syamalamba
Date Deposited: 22 Nov 2012 05:48
Last Modified: 22 Nov 2012 05:48
Official URL: http://dx.doi.org/10.1016/0048-3575(83)90064-0
URI: http://eprints.icrisat.ac.in/id/eprint/8864

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