ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance
ROLE OF DIFFERENT METABOLIC SOURCES OF L-PHENYLALANINE IN THE BIOSYNTHESIS OF FLAVONOIDS |
| Author: | U. Margna |
| DOI: | 10.17660/ActaHortic.1994.381.19 |
| Abstract:
In treatment experiments with a combined use of glyphosate and a-aminooxyphenylpropionic acid and a comparison of the levels of flavonoids, free L-phenylalanine and shikimic acid in the treated tissues evidence was obtained suggesting that flavonoid formation in buckwheat seedling hypocotyls and cotyledons may have different metabolic background. In hypocotyls these compounds seem to be mainly if not exclusively synthesized from L-phenylalanine originating directly from the shikimic acid pathway. In cotyledons, however, the substrate pool for that biosynthesis is apparently composed of L-phenylalanine of both primary and secondary origin with about a half of the total amount of flavonoids being probably synthesized from those molecules of this amino acid which are released from proteins during their catabolism. | |
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