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A biochemical study of BAS 517 using excised corn and soybean root systems
Published online by Cambridge University Press: 12 June 2017
Abstract
The mode of action of BAS 517 in a susceptible plant species, corn, was investigated using an excised root system and 14C-tracer techniques. The root system of a tolerant species, soybean, was used for comparison. When UL-14C- glucose was used as a precursor, 14C incorporation into lipids was reduced in BAS 517-treated corn roots, although 14C incorporation from UL-14C-glucose into lipids was relatively low. Inhibition of 14C incorporation into water-soluble compounds was not definite because of a high degree of variability. Using 14C-acetate as a precursor, 49, 43, and 34% of the recovered radioactivity was found in the lipid fractions of root tips treated with 0, 1.0, and 10 μM BAS 517, respectively. In nontreated soybean root tips, 47% of the recovered radioactivity was found in the lipid fraction compared to 49% in root tips treated with 10 μM BAS 517. Further analysis of lipids showed that BAS 517 inhibited the incorporation of 14C from 14C-acetate into phosphatidylethanolamine, a phospholipid, whereas the labeling of sterols in treated corn roots was not adversely affected. Acetyl CoA carboxylase extracted from root systems of corn and soybean showed different sensitivity to BAS 517, suggesting its role as the herbicide target site and as a basis for the selectivity.
Keywords
- Type
- Physiology, Chemistry, and Biochemistry
- Information
- Copyright
- Copyright © 1999 by the Weed Science Society of America
References
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