Umbelliferone, a phytoalexin associated with resistance of immature Marsh grapefruit to Penicillium digitatum

Uzi Afek, Janeta Orenstein, Shmuel Carmeli, Victor Rodov, Moshe Bar Joseph

Research output: Contribution to journalArticlepeer-review

Abstract

A low concentration (2 μg-1 FW) of 7-hydroxycoumarin (umbelliferone) was found in albedo of non-inoculated mature yellow Marsh grapefruit (Citrus paradisi). The concentration of umbelliferone in albedo of immature green grapefruit (2 months before full maturity) was 17 μg g-1 FW. Four days following inoculation with Penicillium digitatum, the accumulation of umbelliferone in the albedo of mature and immature grapefruit was 28 and 250 μg g-1 FW, respectively. By that period, the infected area in the yellow fruit was as large as 230 mm2, as compared with 8 mm2 in the green fruit. The EC50 of umbelliferone to P. digitatum growth in vitro was 95 μg ml- 1. Additionally, umbelliferone inhibited growth of several other pathogenic fungi in vitro. It is suggested that umbelliferone plays a role in the defense mechanisms of immature grapefruit against P. digitatum.

Original languageEnglish
Pages (from-to)1129-1132
Number of pages4
JournalPhytochemistry
Volume50
Issue number7
DOIs
StatePublished - 10 Apr 1999

Keywords

  • 7- Hydroxycoumarin
  • Citrus paradisi
  • Marsh grapefruit
  • Penicillium digitatum
  • Phytoalexin
  • Resistance
  • Rutaceae
  • Umbelliferone

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