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Plant Pathology Journal
Year: 2008  |  Volume: 7  |  Issue: 1  |  Page No.: 1 - 12

Endophytic Bacillus Species Confer Increased Resistance in Cotton Against Damping off Disease Caused by Rhizoctonia solani

L. Rajendran and R. Samiyappan    

Abstract: Endophytic bacterial strains were evaluated for their efficacy against the damping off disease caused by Rhizoctonia solani in cotton. Among hundred and three endophytic bacterial strains isolated, two strains (Bacillus sp. strains EPCO102 and EPCO16) significantly increased plant growth and inhibited the mycelial growth of Rhizoctonia solani in vitro conditions. The efficacy of talc-based bioformulation of endophytic bacterial strains, EPCO102, EPCO16 and Pseudomonas fluorescens strain Pf1 amended with and without chitin in inducing systemic resistance was tested against damping off disease under greenhouse conditions. The application of the bioformulation through seed, soil and foliar spray significantly reduced disease incidence under greenhouse conditions. The amendment of chitin in the formulation further reduced the disease incidence. EPCO102, EPCO16 and Pf1 strain along with chitin treatment was recorded 46.7, 53.3 and 40.0% damping-off incidence compared to control 83.3%. Treatment with the endophytic bacterial bioformulation increased the levels of the defence-related enzymes chitinase, β-1,3-glucanase, peroxidase, polyphenol oxidase, phenylalanine ammonia-lyase and phenol in cotton plants which had been challenged with R. solani. In addition to plant growth and antibiosis, endophytic bacterial strains enhanced the resistance in plants through the induction of defense enzymes in cotton plants.

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