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http://dx.doi.org/10.5423/RPD.2021.27.2.61

Suppressive Effects of Crude Extracts of Bacillus sp. CT16 and Neobacillus sp. JC05 against Egg Hatch of Meloidogyne incognita  

Jang, Hwajin (Division of Agricultural Microbiology, National Institute of Agricultural Sciences, Rural Development Administration)
Kim, Sang Tae (Division of Agricultural Microbiology, National Institute of Agricultural Sciences, Rural Development Administration)
Sang, Mee Kyung (Division of Agricultural Microbiology, National Institute of Agricultural Sciences, Rural Development Administration)
Publication Information
Research in Plant Disease / v.27, no.2, 2021 , pp. 61-65 More about this Journal
Abstract
Root-knot disease caused by Meloidogyne incognita is major soil pathogen and cause severe economic damages to vegetable crops. In this study, we selected rhizobacteria for biocontrol of the root-knot nematode, M. incognita, and identified; performed bioassay of the bacterial extracts in cucumber seedlings. The crude extracts of strains CT16 and JC05 out of 180 strains inhibited egg hatching and increased juvenile mortality in vitro assay; based on 16S rRNA sequences analysis, the two strains were identified as Bacillus sp. CT16, and Neobacillus sp. JC05. After extracting the bacterial supernatants by using various organic solvents, n-butanol and n-hexane extracts of strain CT16 and n-butanol extract of strain JC05 showed inhibitory activity of egg hatching depending on concentrations. Subsequently, n-butanol extracts of two strains significantly suppressed formation of egg masses in cucumber seedling. Therefore, these results indicated that strains CT16 and JC05 could be used as potential biocontrol agents against M. incognita.
Keywords
Biocontrol; Crude extract; Meloidogyne incognita;
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