Plant and Soil

, Volume 114, Issue 2, pp 269–278 | Cite as

Toxin production by a rhizobacterialPseudomonas sp. that inhibits wheat root growth

  • H. BoltonJr.
  • L. F. Elliott


We studied the production of a toxin inhibitory to both winter wheat (Triticum aestivum L.) root growth andEscherichia coli that was produced by a rhizobacterial pseudomonad. Of several carbon sources tested, the most rapid growth and highest toxin concentrations were obtained with glucose, glycerol, or trehalose. Toxin production was repressed with L-cysteine as the nitrogen source. 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. Toxin production by the bacterium was the same at growth temperatures of 25 and 15°C while it produced less at 5°C. If the bacterium was able to grow, it produced toxin. No compound tested induced an increase in toxin production indicating toxin production is constitutive.

Key words

deleterious inhibitory bacteria pseudomonads rhizobacteria toxin wheat 


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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • H. BoltonJr.
    • 1
  • L. F. Elliott
    • 1
  1. 1.Department of Agronomy and SoilsWashington State University and U.S.D.A., Agricultural Research ServicePullmanUSA

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