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Proferrorosamines and phytopathogenicity in Erwinia spp
G J Feistner1, A Mavridis, K Rudolph
1Beckman Research Institute of the City of Hope, Duarte, CA, USA. gfeistner@aol.com
Summary
Proferrorosamine A from Erwinia bacteria inhibits plant growth by chelating iron. This compound
Area of Science:
- Microbiology
- Plant Pathology
- Biochemistry
Background:
- Plant pathogenic bacteria Erwinia rhapontici produce proferrorosamine A (pFR A).
- pFR A is an iron-chelating compound with potential roles in bacterial virulence.
Purpose of the Study:
- To investigate the phytotoxicity of pFR A.
- To explore the role of pFR A in the virulence of Erwinia species.
- To assess the iron-chelating properties and oxidative stability of pFR A.
Main Methods:
- Seedling growth inhibition assays with wheat and cress.
- Germination rate analysis under varying pFR A concentrations.
- Electrospray ionization mass spectrometry (ESI-MS) for analyzing bacterial metabolites.
Main Results:
- Proferrorosamine A significantly inhibited wheat and cress seedling growth and germination at concentrations of 10 ppm and higher.
- Inhibition was reversible by adding ferrous iron, confirming iron chelation as the mechanism.
- Erwinia persicinus was identified as a producer of pFR A and pFR B, with preliminary evidence of phytopathogenicity.
Conclusions:
- The phytopathogenicity of Erwinia rhapontici and Erwinia persicinus may be partly attributed to the production of proferrorosamines.
- The iron-chelating ability of pFR A is responsible for its growth-inhibitory effects on plants.
- Proferrorosamine A's resistance to oxidation suggests a role in oxidative stress mechanisms within the plant-bacterium interaction.