Functional characteristics of New Zealand wheat rhizosphere <i>Pseudomonas fluorescens</i> isolates and their potential to inhibit invitro growth of <i>Gaeumannomyces graminis</i> var <i>tritici</i>


  • R.M. Warren
  • S.F. Chng
  • R.C. Butler



Pseudomonas fluorescens are soilinhabiting plant growthpromoting rhizobacteria (PGPR) linked with suppression of takeall of wheat a soilborne disease caused by Gaeumannomyces graminis var tritici (Ggt) PGPR increase plant growth by direct stimulation producing metabolites (such as 24diacetylphloroglucinol 24DAPG) to inhibit plant pathogens or by inducing host defence mechanisms Fortythree New Zealand P fluorescens isolates collected from wheat rhizospheres of different cropping histories were characterised for secondary metabolite production using biochemical assays and PCR analysis Their ability to inhibit the growth of Ggt was determined in dual plate assays All of the bacterial isolates produced siderophores and 10 isolates produced hydrogen cyanide (HCN) However none of the isolates produced indole acetic acid and the phlD gene responsible for the production of 24DAPG was not detected Isolates that showed at least 60 inhibition of Ggt growth were found to produce either HCN or high levels of siderophore The results suggest HCN and siderophores could play a role in suppressing Ggt and managing takeall in New Zealand




How to Cite

Warren, R.M., S.F. Chng, and R.C. Butler. “Gt”;. New Zealand Plant Protection 69 (January 8, 2016): 48–56. Accessed February 25, 2024.




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