Growth and sporulation of some pathogenic fungi in the presence of grapefruit extract

Meded Rijksuniv Gent Fak Landbouwkd Toegep Biol Wet. 2002;67(2):315-20.

Abstract

Development of Fusarium oxysporum f. sp. cyclaminis, F. oxysporum f. sp. dianthi, Botrytis cinerea and B. elliptica in the presence of grapefruit extract (GE) was evaluated. Amendment of potato-dextrose agar with 40 micrograms of GE/cm3 inhibited linear growth of tested species at least in 50%. Addition of 40 micrograms of GE/cm3 of medium inhibited spore germination of F. oxysporum f.sp. cyclaminis about 34% whereas germ tube growth was suppressed in 87%. In case of Botrytis species, B. cinerea spores were more susceptible on GE than B. elliptica. They did not germinate, however, at 200 micrograms of GE/cm3. Drenching of peat, artificially infested with F. oxysporum f. sp. dianthi, with GE at conc. 165 micrograms/cm3 resulted in drastical decrease of colony forming unit numbers and this suppressive effect was observed at least 35 days.

MeSH terms

  • Botrytis / drug effects
  • Botrytis / growth & development
  • Citrus paradisi*
  • Colony Count, Microbial
  • Fungi / drug effects*
  • Fungi / growth & development
  • Fusarium / drug effects
  • Fusarium / growth & development
  • Plant Extracts / pharmacology*
  • Spores, Fungal / drug effects*
  • Spores, Fungal / growth & development

Substances

  • Plant Extracts