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http://dx.doi.org/10.4014/jmb.1203.03068

Physiological and Molecular Characterization of a Newly Identified Entomopathogenic Bacteria, Photorhabdus temperata M1021  

Jang, Eun-Kyung (School of Applied Biosciences, Kyungpook National University)
Ullah, Ihsan (School of Applied Biosciences, Kyungpook National University)
Lim, Jong-Hui (School of Applied Biosciences, Kyungpook National University)
Lee, In-Jung (School of Applied Biosciences, Kyungpook National University)
Kim, Jong-Guk (Department of Life Sciences and Biotechnology, College of National Sciences, Kyungpook National University)
Shin, Jae-Ho (School of Applied Biosciences, Kyungpook National University)
Publication Information
Journal of Microbiology and Biotechnology / v.22, no.12, 2012 , pp. 1605-1612 More about this Journal
Abstract
The present study concerned the identification and characterization of a novel bacterial strain isolated from entomopathogenic nematodes collected from different regions in Korea. The bacterial isolate M1021 was Gramnegative, bioluminescent, and produced red colonies on MacConkey agar medium. A rod-shaped structure was confirmed by the electron micrograph. Fatty acid composition was analyzed by using the Sherlock MIDI system. The identification was further supported by 16S rDNA sequence analysis, which revealed 96-99% sequence homology with strains of Photorhabdus temperata. The location of the isolated strain of P. temperata in the phylogenetic tree was confirmed and it was named P. temperata M1021. P. temperata M1021 exhibited catalase, protease, and lipase activities when grown on appropriate media supplemented with respective substrates. The culture of P. temperata M1021 exhibited insecticidal activity against the larvae of Galleria mellonella and the activity was the highest after 3-4 days of cultivation with agitating at $28^{\circ}C$ under 220 rpm. Antibacterial activity was also observed against Salmonella Typhimurium KCTC 1926 and Micrococcus luteus KACC 10488.
Keywords
Antibacterial activity; entomopathogenic; Galleria mellonella; insecticidal toxicity; Photorhabdus temperata;
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