Immunological detection of syringopeptins produced by Pseudomonas syringae pv. lachrymans

V. Fogliano, M. Gallo, F. Vinale, A. Ritieni, G. Randazzo, M. Greco, R. Lops, A. Graniti*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)

Abstract

Several strains of plant pathogenic Pseudomonas are known to produce phytotoxic lipodepsipeptides (syringomycin, syringopeptins and related compounds) in vitro. However, detection of these compounds in organic extracts from diseased plant tissues has been attempted by chromatographic methods for syringomycin only. A macromolecular derivative of syringopeptins (KLH-SP(25A+B)) was used to raise polyclonal antibodies in rabbit. The antiserum was able to recognize free syringopeptins (SP22 and SP25) with an estimated detection limit of 0.05 μg per well in the indirect ELISA, and 0.01 μg per well in the competitive ELISA. Cross-reaction with other structurally related lipodepsipeptides, e.g. syringomycins and pseudomycin A, was less than 20%. Using the competitive ELISA method developed in this study, relatively abundant quantities of the toxins, i.e. approximately 0.1 mg of syringopeptins per gram fresh tissue, were detected when an aqueous extract from cotyledons of zucchini infected with a strain of P. syringae pv. lachrymans was tested.

Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalPhysiological and Molecular Plant Pathology
Volume55
Issue number5
DOIs
Publication statusPublished - Nov 1999
Externally publishedYes

Keywords

  • Cucurbita pepo
  • Pseudomonas syringae pv. lachrymans
  • Syringopeptins
  • Zucchini

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