Characterization of a toxin produced by a rhizobacterialPseudomonas sp. that inhibits wheat growth

@article{Bolton2005CharacterizationOA,
  title={Characterization of a toxin produced by a rhizobacterialPseudomonas sp. that inhibits wheat growth},
  author={Harvey Bolton and L. F. Elliott and S. Gurusiddaiah and James K. Fredrickson},
  journal={Plant and Soil},
  year={2005},
  volume={114},
  pages={279-287}
}
A toxin produced by a deleterious rhizobacterial pseudomonad that inhibits both winter wheat (Triticum aestivum L.) root andEscherichia coli growth was characterized. The toxin was rapidly deactivated at pH 2 and 12 and by autoclaving (121°C, 15 minutes). Less toxin was destroyed as the temperature and time of exposure decreased, and at 40°C it was stable for at least 24 hours. The toxin was extremely polar and could not be extracted from culture filtrates with organic solvents. The compound… 
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TLDR
Toxin was produced during the late exponential and early stationary phase of growth by the bacterium and, contrary to studies with other toxins, was unaffected by Fe and P concentrations in the growth medium.
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Root-colonizing pseudomonads capable of inhibiting seedling winter wheat root growth in an agar seedling bioassay also significantly inhibited wheatroot growth in vermiculite, providing further evidence that a toxin, produced by these organisms, is involved in growth retardation.
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  • Biology
    Applied and environmental microbiology
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A simple bacteriological technique involving inhibition zone production on a lawn of Escherichia coli was developed to detect antimetabolite toxin production by phytopathogenic species of
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