Isolation, purification, and identification of 2-(p-hydroxyphenoxy)-5,7-dihydroxychromone: A fungal-induced phytoalexin from Cassia obtusifolia

Amir Sharon*, Rodolfo Ghirlando, Jonathan Gressel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A single phytoalexin was isolated and purified from 12- to 14-day-old leaves of Cassia obtusifolia L. inoculated with Alternaria cassiae Jurair & Khan. The structure was elucidated by 1H- and 13C-nuclear magnetic resonance and mass spectrometry as 2-(p-hydroxyphenoxy)-5,7-dihydroxychromone. The compound was shown to be derived in part from phenylalanine. Radial growth of A. cassiae was inhibited 50% by the compound at 0.3 millimolar. This moderate toxicity is compensated for by the relatively high levels (3 millimolar) accumulated. Phenoxychromones have been previously reported only as constitutive secondary metabolites in Artemisia capillaris Thunb., in which their function is unknown.

Original languageEnglish
Pages (from-to)303-308
Number of pages6
JournalPlant Physiology
Volume98
Issue number1
DOIs
StatePublished - 1992
Externally publishedYes

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