Isolation and selection of bacterial strains with bioactivity against Erwinia carotovora from Ngoc Linh ginseng cultivated soil in Quang Nam

Abstract

This study aims to isolate and select bacterial strains that are antagonistic to Erwinia carotovora causing the soft rot disease on plants from the Ngoc Linh ginseng cultivated soil in Nam Tra My district, Quang Nam province. Eight out of 65 bacterial strains that were screened and identified by the agar diffusion plate method exhibited their resistance to E. carotovora. The K29 strain was determined as a Gram-positive bacterium, having the capability of producing enzymes and assimilating/fermenting different carbon sources, having the strongest anti-bacterial activity with a resistant zone diameter of 27 mm to E. carotovora and relating closely to Bacillus amyloliquefaciens with 99.44% similarity.