Inhibition of fatty acid biosynthesis in isolated bean and maize chloroplasts by herbicidal phenoxy-phenoxypropionic acid derivatives and structurally related compounds |
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| Authors: | Hans H Hoppe Helga Zacher |
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| Institution: | Institut für Pflanzenpathologie und Pflanzenschutz der Georg-August-Universität Göttingen, Grisebachstrasse 6, D-3400 Göttingen, Federal Republic of Germany |
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| Abstract: | The effects of nine phenoxy-phenoxypropionic acid derivatives and structurally related compounds on the incorporation of 14C]-acetate into free fatty acids in isolated bean and maize chloroplasts were studied. The compounds tested were esters and the corresponding free acids, OH-diclofop, a nonherbicidal metabolite of diclofop in plants, and d and l enantiomers of diclofop. Fatty acid biosynthesis in bean chloroplasts was not affected by all compounds. OH-Diclofop had a weak inhibitory effect on fatty acid synthesis in maize chloroplasts, while free acids were stronger inhibitors than the corresponding esters in the same system. Uptake studies with diclofop-methyl and diclofop indicated that the esters showed higher uptake rates in chloroplasts suspension. d-Diclofop (I50, 9 × 10?8M) was a more potent inhibitor than l-diclofop (I50, 4 × 10?6M). This agrees with the low herbicidal activity of the l enantiomer in vivo. The results suggest that the mode of action in this type of herbicide may be closely linked with the inhibition of fatty acid biosynthesis. The tolerance of beans could be based on an insensitivity of the target site. |
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