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KMID : 0545120130230070897
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Journal of Microbiology and Biotechnology
2013 Volume.23 No. 7 p.897 ~ p.904
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Biocontrol of Late Blight and Plant Growth Promotion in Tomato Using Rhizobacterial Isolates
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Kabir Lamsal
Kim Sang-Woo
Kim Yun-Seok
Lee Youn-Su
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Abstract
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Seven bacterial isolates (viz., AB05, AB10, AB11, AB12, AB14, AB15, and AB17) were derived from the rhizosphere and evaluated in terms of plant growth-promoting activities and the inhibition of Phytophthora infestans affecting tomatoes in Korea. According to 16S rDNA sequencing, a majority of the isolates are members of Bacillus, and a single isolate belongs to Paenibacillus. All seven isolates inhibited P. infestans by more than 60% in vitro. However, AB15 was the most effective, inhibiting mycelial growth of the pathogen by more than 80% in vitro and suppressing disease by 74% compared with control plants under greenhouse conditions. In a PGPR assay, all of the bacterial isolates were capable of enhancing different growth parameters (shoot/root length, fresh biomass, dry matter, and chlorophyll content) in comparison with non-inoculated control plants. AB17-treated plants in particular showed the highest enhancement in fresh biomass with 18% and 26% increments in the root and shoot biomass, respectively. However, isolate AB10 showed the highest shoot and root growth with 18% and 26% increments, respectively. Moreover, the total chlorophyll content was 14%~19% higher in treated plants.
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KEYWORD
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Biological control, PGPR, Phytophthora infestans, Solanum lycopersicon, inhibition effect
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