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Agricultural crops are susceptible to abiotic and biotic factors. Among biotic factors, plant pathogens attacks are prominent and significantly reduce the crop productivity and production. Long term application of synthetic pesticides in agriculture not only causes resistance development in pathogens but also deteriorates the soil quality and pollutes the ecosystem. In the current study, an investigation has been made with an objective to isolate an endophytic bacterium from  Withania somnifera  seed and evaluate its potential biocontrol activity against soil-borne pathogens like  Fusarium oxysporum  var.  ciceri  and  Rhizoctonia solani . The molecular approach of bacterium identification using 16S rRNA sequencing methods includes kit based DNA extraction and PCR amplification and the isolated endophytic bacterium was identified as  Pseudomonas stutzeri . In dual culture assay, the endophytic bacterium  P. stutzeri  PSIISS-1 effectively suppressed growth of pathogenic fungi  F. oxysporum  var.  ciceri  (61.0%) and  R. solani  (53.3%), respectively.  In vivo  studies were conducted with initial microbial inoculum size of 10 8 cell/ml and the studies revealed that the bacterium  P. stutzeri  PSIISS-1 co-inoculated with  R. solani  had significantly inhibited the sheath blight disease with the efficacy of 76% in susceptible paddy MTU-7029. Simultaneously, co-inoculation of  P. stutzeri  PSIISS-1 along with the pathogen  F. oxysporum  var.  ciceri  in chickpea JG-14 variety resulted in reduction of wilt symptom up to 80.45%. Bacterial inhibitions against the pathogens were corroborated with chitinase, protease and lipase enzymatic activities. Based on the results obtained from the study,  P. stutzeri  showed biocontrol activity against plant pathogens which can be used as potential bio-pesticides.

archives of phytopathology and plant protection

Biocontrol potential of  Pseudomonas stutzeri  endophyte from  Withania somnifera  (Ashwagandha) seed extract against pathogenic  Fusarium oxysporum  and  Rhizoctonia solani