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European Journal of Plant Pathology

, Volume 112, Issue 2, pp 133–142 | Cite as

Luteoforol, a flavan 4-ol, is induced in pome fruits by prohexadione-calciumand shows phytoalexin-like properties against Erwinia amylovoraand other plant pathogens

  • Francesco Spinelli
  • John-Bryan Speakman
  • Wilhelm Rademacher
  • Heidi Halbwirth
  • Karl Stich
  • Guglielmo Costa
Article

Abstract

Treatments with prohexadione-calcium led to lowered incidence of fire blight, scab and other diseases in pome fruit trees and other crop plants. In addition to acting as a growth regulator, prohexadione-calcium interferes with flavonoid metabolism and induces the accumulation of the 3-deoxycatechin luteoliflavan in shoots of pome fruit trees. Luteoliflavan does not possess any remarkable antimicrobial activity. Therefore luteoforol, its unstable and highly reactive precursor, has been tested in vitro for its bactericidal and fungicidal activities. Luteoforol was found to be highly active against different strains of Erwinia amylovora, the causal agent of fire blight, and all other bacterial and fungal organisms tested. Phytotoxic effects were also observed in pear plantlets. The results obtained indicate that prohexadione-calcium induces luteoforol as an active principle with non-specific biocidal properties. It is proposed that luteoforol is released upon pathogen attack from its cellular compartment and inhibits further disease development by destroying pathogen cells as well as by inducing a hypersensitive-like reaction in the host plant tissue. This mechanism would be closely analogous to the one known for structurally related phytoalexins in sorghum.

Keywords

Acylcyclohexanediones fire blight induced resistance Pantoea agglomerans, phytoalexins Pseudomonas fluorescens, Venturia inaequalis 

Abbreviations

FHT

flavanone 3-hydroxylase

ProCa

prohexadione-calcium

TrixE

trinexapac-ethyl

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Copyright information

© Springer 2005

Authors and Affiliations

  • Francesco Spinelli
    • 1
  • John-Bryan Speakman
    • 2
  • Wilhelm Rademacher
    • 2
  • Heidi Halbwirth
    • 3
  • Karl Stich
    • 3
  • Guglielmo Costa
    • 1
  1. 1.Department of ArboricultureUniversity of Bologna, BolognaItaly;
  2. 2.BASF Agricultural CenterGlobal Research Crop Protection PR/HBLimburgerhofGermany
  3. 3.Institute of Technical BioScienceTechnical University of ViennaViennaAustria

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