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The Scientific World Journal
Volume 2012, Article ID 723293, 6 pages
Research Article

Isolation, Characterization, and Identification of Biological Control Agent for Potato Soft Rot in Bangladesh

1Department of Plant Pathology, Bangabadhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
2Nanotechnology and Catalysis Research Center, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
3Institute of Tropical Agriculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Malaysia
4Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000 Kangar, Malaysia

Received 8 January 2012; Accepted 12 February 2012

Academic Editors: F. J. de Bruijn, J.-F. Hausman, and D. Zhou

Copyright © 2012 M. M. Rahman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A total of 91 isolates of probable antagonistic bacteria of potato soft rot bacterium Erwinia carotovora subsp. carotovora (Ecc) were extracted from rhizospheres and endophytes of various crop plants, different soil varieties, and atmospheres in the potato farming areas of Bangladesh. Antibacterial activity of the isolated probable antagonistic bacteria was tested in vitro against the previously identified most common and most virulent soft rot causing bacterial strain Ecc P-138. Only two isolates E-45 and E-65 significantly inhibited the in vitro growth of Ecc P-138. Physiological, biochemical, and carbon source utilization tests identified isolate E-65 as a member of the genus Bacillus and the isolate E-45 as Lactobacillus sp. The stronger antagonistic activity against Ecc P-138 was found in E-65 in vitro screening and storage potatoes. E-65 reduced the soft rot infection to 22-week storage potatoes of different varieties by 32.5–62.5% in model experiment, demonstrating its strong potential to be used as an effective biological control agent for the major pectolytic bacteria Ecc. The highest (62.5%) antagonistic effect of E-65 was observed in the Granola and the lowest (32.7%) of that was found in the Cardinal varieties of the Bangladeshi potatoes. The findings suggest that isolate E-65 could be exploited as a biocontrol agent for potato tubers.