| | 1 | Author
| NigelC P Baldwin, BarrieW. Bycroft, PaulM. Dewick, John Gilbert, Ian Holden | Requires cookie* | | | Title
| Biosynthesis of Trichothecene My cotoxins in Fusarium culmorum Cultures  | | | | Abstract
| A high yielding production of the trichothecene mycotoxin 3-acetyldeoxynivalenol (3-AcDON) in cultures of Fusarium culmorum is described. By supplying [14C]acetate, 14C-labelled 3-AcDON suitable for further metabolic studies has been obtained. The pattern of labelling has been ascertained by using 13C-labelled acetate precursors, and is in line with established biosynthetic data. A second trichothecene produced in significant amounts by F. culmorum has been identified as 3a, 15-diacetoxy-7a, 8a-dihydroxy-12, 13-epoxytrichothec-9-ene (7a, 8 a-dihydroxycalonec-trin). | | | |
Reference
| Z. Naturforsch. 40c, 514—518 (1985); received May 8 1985 | | | |
Published
| 1985 | | | |
Keywords
| Mycotoxin, Trichothecene, Fusarium, Biosynthesis, 3-Acetyldeoxynivalenol | | | |
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| default:Reihe_C/40/ZNC-1985-40c-0514.pdf | | | | Identifier
| ZNC-1985-40c-0514 | | | | Volume
| 40 | |
| 2 | Author
| U. Margna, L. Laanest, E. Margna, T. Vainjärv | Requires cookie* | | | Title
| L-Tyrosine as a Precursor of Flavonoids in Buckwheat Cotyledons | | | | Abstract
| Exogenous L-tyrosine was incorporated 1 3 -1 4 tim es less effectively than exogenous L-phenyl-alanine into flavonoids in excised cotyledons o f 3 days old buckw heat seedlings but proved to be an only 5 times poorer precursor when the experim ents were carried out with 5 days old material. Simultaneous administration o f L-phenylalanine m arkedly reduced incorporation o f L-tyrosine into flavonoids. A similar decrease in the utilization o f exogenous L-tyrosine for flavonoid b io synthesis occurred in kinetin-treated cotyledons. H owever, in cotyledons treated with high doses o f glyphosate, an inhibitor o f the shikim ic acid pathway, an increase in the formation o f flavonoids from exogenously supplied L-tyrosine was observed. Under all conditions the relative incorporation rate o f exogenous L-tyrosine was highest for anthocyanins and lowest for C-glyco-sylflavones while within the latter class o f com pounds the luteolinic derivatives orientin and iso-orientin incorporated more label than their apigeninic analogues vitexin and isovitexin. PAL and TAL activities were found to be present in the cotyledons in a ratio o f 50:1. The possible role o f L-tyrosine as an alternative natural precursor for the biosynthesis o f flavonoids and other related polyphenols is discussed. | | | |
Reference
| Z. Naturforsch. 40c, 154 (1985); received April 24/O ctober 29 1984 | | | |
Published
| 1985 | | | |
Keywords
| Anthocyanins, Flavonoids, Biosynthesis, [14C-L]Tyrosine, [14C-L]Phenylalanine, Kinetin, Glyphosate, Fagopyrum esculentum | | | |
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| default:Reihe_C/40/ZNC-1985-40c-0154.pdf | | | | Identifier
| ZNC-1985-40c-0154 | | | | Volume
| 40 | |
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