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Effectiveness of Antagonistic Bacterial Metabolites to Control Rhizoctonia solani on Lettuces and Fusarium oxysporum on Tomatoes

  • Vu, Van Hanh (Institute of Biotechnology) ;
  • Thi, Quyen Dinh (Institute of Biotechnology) ;
  • Rita, Grosch (Leibniz Institute for Vegetable and Ornamental Crops (IGZ)) ;
  • Dung, Nguyen Ngoc (Institute of Biotechnology)
  • Received : 2012.07.05
  • Accepted : 2013.01.03
  • Published : 2013.03.28

Abstract

Rhizoctonia solani and Fusarium oxysporum cause yield losses in numerous economically important crops. To develop a bio-control agent, cell free extracellular compounds (ECs) of 5 bacterial strains Burkholdria sp. L1, Pseudomonas sp. L4, Pseudomonas chlororaphis VN391, Bacillus subtilis VN21 and Enterobacter sp. VN99 from Vietnamese fields, which reduced levels of R. solani root rot in lettuces and F. oxysporum root rot in tomatoes, were investigated. In a growth chamber, ECs of all antagonists markedly enhanced the biomass of lettuces (10 to 14.1%) and tomatoes (11.38 to 13.88%). In greenhouses, the disease's severity on both crops treated with ECs of the antagonists was reduced significantly and biomass losses in the plants decreased markedly. The reduction level of R. solani root rot in lettuces was 75, 66.7, 50, and 16.7% by ECs of strains L1, L4, VN21 and VN391, respectively. The biomass of lettuces increased markedly by 29.13%, 21.67%, and 23.4% by ECs of strains L1, L4 and VN21, respectively. Similarly, the reduction levels of F. oxysporum root rot in tomatoes was 76.3, 75, 41.7 and 25% by ECs of strain L1, L4, VN21 and VN391, respectively, and the biomass was significantly enhanced by 14.42, 12.7 and 13%, respectively. The ECs of strain L1 exhibited the most effective bio-control agents to suppress R. solani and F. oxysporum.

Keywords

Rhizoctonia solani root rot;Fusarium oxysporum root rot;extracellular compounds;antagonist;enhanced biomass

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