Biocontrol and plant growth promoting potential of Pseudomonas sp. MML2212 from the rice rhizosphere

摘要

A total of 460 fluorescent pseudomonads were isolated from rice rhizosphere soils collected from TamilNadu State, India and screened against Rhizoctonia solani, the sheath blight pathogen of rice by dualculture. Due to superior antagonistic efficacy against the fungal pathogens over the other strains, anefficient bacterial strain (MML2212) was selected and identified as Pseudomonas sp. The culture filtrateof Pseudomonas sp. MML2212 significantly inhibited the mycelial growth, conidial and sclerotialgermination of many fungal pathogens. The strain Pseudomonas sp. MML2212 produced two antifungalcompounds with the Rf values of 0.67 and 0.36. The production of hydrogen cyanide and siderophoreswas determined. The whole culture of Pseudomonas sp. MML2212 significantly improved the plantgrowth parameters in rice as compared to culture filtrate and medium control both in non-sterile andsterile soils.