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. 1982 Apr;69(4):853–858. doi: 10.1104/pp.69.4.853

Metabolism of Tryptophan, Indole-3-acetic Acid, and Related Compounds in Parasitic Plants from the Genus Orobanche

Volker Magnus 1, Šumski Šimaga 1, Sonja Iskrić 1, Sergije Kveder 1
PMCID: PMC426317  PMID: 16662308

Abstract

Metabolic reactions involving the aliphatic side chain of tryptophan were studied in the holoparasitic dicotyledonous plants Orobanche gracilis Sm., O. lutea Baumg., and O. ramosa L. Unlike known autotrophic plants, the parasite metabolized l-tryptophan directly to indole-3-carboxaldehyde, which was further converted to indole-3-methanol and indole-3-carboxylic acid. Independently, these metabolites were also formed from d-tryptophan, tryptamine, indole-3-lactic acid, and indole-3-acetic acid. As in autotrophic plants, tryptophan and tryptamine were also converted, via indole-3-acetaldehyde, to indole-3-acetic acid, indole-3-ethanol, and its glucoside. The branch of tryptophan metabolism relevant to auxin biogenesis and catabolism is, therefore, not rudimentary in Orobanche but even more complex than in autotrophic higher plants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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