Involvement of secondary metabolites and extracellular lytic enzymes produced by Pseudomonas fluorescens in inhibition of Rhizoctonia solani, the rice sheath blight pathogen

M. Nagarajkumar, R. Bhaskaran, R. Velazhahan

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Fourteen strains of Pseudomonas fluorescens isolated from rhizosphere soil of rice were tested for their antagonistic effect towards Rhizoctonia solani, the rice sheath blight fungus. Among them, PfMDU2 was the most effective in inhibiting mycelial growth of R. solani in vitro. Production of chitinase, β-1,3-glucanase, siderophores, salicylic acid (SA) and hydrogen cyanide (HCN) by P. fluorescens strains was evaluated. The highest β-1,3-glucanase activity, siderophore production, SA production and HCN production were recorded with PfMDU2. A significant relationship between the antagonistic potential of P. fluorescens against R. solani and its level of β-1,3-glucanase, SA and HCN was observed.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalMicrobiological Research
Issue number1
Publication statusPublished - 2004



  • Biological control
  • Oryza sativa
  • Pseudomonas flourescens
  • Rhizoctonia solani
  • Sheath blight

ASJC Scopus subject areas

  • Microbiology

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