P. B. Barrett, J. Harwood
Dec 5, 1998
Citations
0
Influential Citations
6
Citations
Journal
Phytochemistry
Abstract
Abstract The thiocarbamate herbicide, pebulate, and its more potent herbicidal form, pebulate sulphoxide, selectively inhibit the formation of very long-chain fatty acids (VLCFAs) in young barley leaves without significantly affecting de novo synthesis of palmitate and stearate. The aim of this study was to investigate the action of two safening chemicals on the inhibition of VLCFA synthesis by these thiocarbamate compounds. We examined the action of the monooxygenase inhibitor, 1-aminobenzotriazole, a substance which could potentially reduce the oxidation of pebulate ( S -propylbutylethyl thiocarbamate) to its sulphoxide form. Treatment of young barley leaves with this solution (up to 50 mg l −1 ), however, was unable to block the specific inhibitory effects of pebulate or its sulphoxide derivative on VLCFA synthesis. In contrast, the safener naphthalic anhydride, when applied as a seed dressing (0.5% w/w), was able to counteract the inhibitory effects of pebulate and pebulate sulphoxide on VLCFA biosynthesis.