Accumulation of 9 beta,19-cyclopropylsterols in cereals treated with fenpropimorph

The effect of a systemic fungicide, fenpropimorph (Corbel/Mistal BASF), on the growth and sterol biosynthesis of wheat (Triticum aestivum L.) and maize (Zea mays L.) seedlings was studied to assess its phytotoxicity. Application of 250 micromole fungicide retarded the growth of the shoot, primary le...

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Veröffentlicht in:Journal of agricultural and food chemistry 1991-02, Vol.39 (2), p.404-407
Hauptverfasser: Khalil, I.A. (North-West Frontier Province Agricultural University, Peshawar, Pakistan), Mercer, E.I
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Sprache:eng
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Zusammenfassung:The effect of a systemic fungicide, fenpropimorph (Corbel/Mistal BASF), on the growth and sterol biosynthesis of wheat (Triticum aestivum L.) and maize (Zea mays L.) seedlings was studied to assess its phytotoxicity. Application of 250 micromole fungicide retarded the growth of the shoot, primary leaf, and root of both the crops. It also inhibited the biosynthesis of major phytosterols, campesterol, stigmasterol, and sitosterol. These sterols were largely replaced by 9 beta,19-cyclopropyl- and delta 8-sterols. These effects were probably due to the interaction of the fungicide with the sterol enzyme systems: (i) cycloeucalenol-obtusifoliol isomerase; (ii) delta 8- leads to delta 7-isomerase; and (iii) delta 22-desaturase. At the lowest concentration (5 micromole) tested, fenpropimorph was not phytotoxic
ISSN:0021-8561
1520-5118
DOI:10.1021/jf00002a036