Sterol composition of isolates of Erysiphe graminis f.sp. tritici differing in sensitivity to fenpropimorph
1998
Engels, A.J.G. | Waard, M.A. de
Isolates of Erysiphe graminis f.sp. tritici with wild-type or reduced sensitivity to fenpropimorph were similar in sterol composition, in, ergosta-5, 24(28)-dienol (+/- 90%) and episterol (+/- 10%). Following treatment with fenpropimorph, the relative content of episterol increased in conidia of all isolates tested, while that of ergosta-5,24(28)-dienol decreased. These results suggest that fenpropimorph, under the test conditions used, does not inhibit activity of sterol delta 14-reductase or delta 8 leads to delta 7-isomerase but probably interferes with the final part of the demethyl sterol synthesis. However, modifications in this part of the pathway are probably not responsible for the decreased sensitivity of the pathogen to the fungicide.
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