Abstract
The effect of different types of plant growth retardants on fungal gibberellin (GA) formation has been studied in cultures of Gibberella fujikuroi and Sphaceloma manihoticola. Quaternary ammonium compounds (chlormequat chloride, mepiquat chloride, Amo-1618), triazoles (uniconazole and several experimental compounds), and the norbornanodiazetine tetcyclacis inhibited GA biosynthesis in both fungal species. Concentrations between 2 × 10−4 and 10−9m were required for a 50% inhibition of the production of gibberellin A3 in Gibberella fujikuroi and of giberellin A4 in Sphaceloma manihoticola. The formation of other prominent GAs was affected at a similar degree of intensity. Tetcyclacis was the most active compound in both fungi. Compared to the growth retardants mentioned above, the biological activity of chlorphonium chloride was low. The acylcyclohexanediones prohexadione and LAB 198 999 had virtually no activity. Most likely, this lack of activity is due to a rapid metabolism of the compounds in the cultures. For the triazole-type compounds and tetcyclacis, a relatively distinct correlation exists in their ability to inhibit GA formation in fungal cultures, to block ent-kaurene oxygenase in a cell-free system, and to reduce shoot growth of rice seedlings. Due to differences in their metabolic fate and species specificities, such conclusions cannot be made for the other compounds.
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Selected References
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- Coolbaugh R. C., Hell D. R., West C. A. Comparative Effects of Substituted Pyrimidines on Growth and Gibberellin Biosynthesis in Gibberella fujikuroi. Plant Physiol. 1982 Mar;69(3):712–716. doi: 10.1104/pp.69.3.712. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Harada H., Lang A. Effect of some (2-chloroethyl) trimethylammonium chloride analogs and other growth retardants on gibberellin biosynthesis in Fusarium moniliforme. Plant Physiol. 1965 Jan;40(1):176–183. doi: 10.1104/pp.40.1.176. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rademacher W., Graebe J. E. Gibberellin A4 produced by Sphaceloma manihoticola, the cause of the superelongation disease of cassava (Manihot esculenta). Biochem Biophys Res Commun. 1979 Nov 14;91(1):35–40. doi: 10.1016/0006-291x(79)90579-5. [DOI] [PubMed] [Google Scholar]