Salicylates of Intact Salix Myrsinifolia Plantlets Do Not Undergo Rapid Metabolic Turnover

Overview

Journal Plant Physiol

Specialty Physiology

Date 2000 Mar 11

PMID 10712554

Citations 13

Authors

T M Ruuhola

Affiliations

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Abstract

Salicylates, the main phenolic glucosides of northern willow (Salix spp.), play an important role in plant-herbivore interactions. Salicylates are labile metabolites that are thought to undergo metabolic turnover. Salicylates are synthesized from phenylalanine (Phe) via the shikimate pathway. 2-Aminoindan-2-phosphonic acid (AIP), a strong inhibitor of Phe ammonia-lyase (EC 4.3.1.5), was used to block the biosynthesis of salicylates. The aim of this study was to investigate long-term turnover of salicylates in intact micropropagated plantlets of Salix myrsinifolia Salisb. The biosynthesis of salicylates was inhibited efficiently but not completely by 30 microM 2-aminoindan-2-phosphonic acid. Inhibitor treatment, aside from leading to a high accumulation of Phe, also led to an increase in tyrosine and tryptophan, indicating that 2-aminoindan-2-phosphonic acid may also inhibit enzymes other than Phe ammonia-lyase. Salicylates were shown to be unexpectedly stable metabolites that did not undergo marked metabolic turnover in intact plants; in leaves no significant turnover occurred, and in the stems the five salicylates studied were turned over slowly, with half-lives of 11 to 25 d. The total amount of salicylate in mature shoots decreased only 0.6% per day.

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