Plant Growth Regulating Properties of Sterol-Inhibiting Fungicides
- 106 Downloads
A group of sterol-inhibiting fungicides, diverse with respect to chemical structure but with the same specific mode of action, has been recently introduced for plant disease control (Siegel, 1981). They belong to the chemical class of triazoles, imidazoles, pyrmidines, morpholines, piperazines, and the structures of some of the compounds are illustrated in Figure 6.1 (Kato, 1982). Most of the compounds are highly active in controlling various economically important fungal diseases including, powdery mildew, smut, bunt, and rust fungi. In other words they control a wide range of diseases caused by Ascomycetes, Basidomycetes and Deuteromycetes and they are not used to control Phycomycetes. The sterol-inhibiting fungicides block ergosterol biosynthesis by inhibiting C-14 demethylation reactions. The specific mechanisms of inhibition of ergosterol biosynthesis which eventually curtails membrane synthesis and fungal growth are discussed by Siegel (1981) and Kato (1982). The mode of action of these fungicides as inhibitors of lipid biosynthesis, in particular the sterol component and the effects of other plant growth retardants suggesting possible sites of inhibition are covered in an excellent review by Ragsdale (1977).
KeywordsPowdery Mildew Stomatal Resistance Kentucky Bluegrass Ergosterol Biosynthesis Frost Hardiness
Unable to display preview. Download preview PDF.
- Fletcher, R. A. and V. Arnold. 1985. Stimulation of chlorophyll production in cucumber cotyledons by triadimefon. Physiol. Plant,(in press).Google Scholar
- Fletcher, R. A. and G. Hofstra. 1985. Triadimefon a plant multiprotectant. Plant and Cell Physiol (in press).Google Scholar
- Forster, H. (1978) Mechanism of action and side effects of triadimefon and triadimenol in barely plants. In: 3rd Int. Congr. Plant Pathol. (Muchen, 13–23 August) p. 365.Google Scholar
- Hills, F. J. and G. A. Nikolich. 1985. Sterol-inhibiting fungicides for control of sugar beet powdery mildew, methods and rates of application and evidence of growth regulation. Plant Dis, 69: 257–261.Google Scholar
- Izumi, K., I. Yamaguchi, A. Wada, H. Oshio and N. Takahashi. 1984. Effects of a new plant growth retardant (E)-1-(4-chlorophenyl)-4,4dimetyl-1–2-(1,2,4-triazol-1-yl)-1-penten-3-ol (S-3307) on growth and gibberellin content of rice plants. Plant and Cell Physiol, 25: 611–617.Google Scholar
- Kato, T. 1982. Biosynthetic processes of ergosterol as the target of fungicides in Pesticides Chemistry: Human welfare and the Environment Vol. III . J. Miyamota and P. C. Kearney (eds.). Pergamon Press, New York. pp. 33–49.Google Scholar
- Kane, R. T. and R. W. Smiley. 1983. Plant growth-regulating effects of systemic fungicides applied to Kentucky bluegrass. Argon. J, 75: 469–473.Google Scholar
- Kuraishi, S., T. Tezuka, T. Ushijima and T. Tazaki. 1966. Effect of cytokinins on frost hardiness. Plant and Cell Physiol, 7: 705–706.Google Scholar
- Litchtenthaler, H. K. 1979. Effect of biocides on the development of the photosynthetic apparatus of radish seedlings grown under strong and weak light conditions. Z. Naturforsch, 34: 936–940.Google Scholar
- Ragsdale, N. N. 1977. Inhibitors of lipid synthesis. In: Antifungal Compounds, Vol. II. M. R. Siegel and H. D. Sisler. (eds.) Marcel Dekker Inc., New York. pp. 333–363.Google Scholar
- Seem, R. C., H. Cole and N. L. Lacasse. 1972. Suppression of ozone injury to Phaseolus vulgaris “Pinto III” with triarimol and its monochlorophenyl cyclohexyl analogue. Plant Dis. Rept, 56: 386–390.Google Scholar