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 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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