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KMID : 0545120170270081449
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Journal of Microbiology and Biotechnology
2017 Volume.27 No. 8 p.1449 ~ p.1456
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Prevalence and Toxin Characteristics of Bacillus thuringiensis Isolated from Organic Vegetables
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Kim Jung-Beom
Choi Ok-Kyung
Kwon Sun-Mok
Cho Seung-Hak
Park Byung-Jae
Jin Na-Young
Yu Yong-Man
Oh Deog-Hwan
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Abstract
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The prevalence and toxin characteristics of Bacillus thuringiensis isolated from 39 organic vegetables were investigated. B. thuringiensis was detected in 30 out of the 39 organic vegetables (76.9%) with a mean value of 2.60 log CFU/g. Twenty-five out of the 30 B. thuringiensis isolates (83.3%) showed insecticidal toxicity against Spodoptera exigua. The hblCDA, nheABC, and entFM genes were found to be the major toxin genes, but the ces gene was not detected in any of the tested B. thuringiensis isolates. The hemolysin BL enterotoxin was detected in all 30 B. thuringiensis isolates (100%). The non-hemolytic enterotoxin complex was found in 27 out of 30 B. thuringiensis isolates (90.0%). The B. thuringiensis tested in this study had similar toxin gene characteristics to B. cereus, which possessed more than one toxin gene. B. thuringiensis could have the potential risk of foodborne illness based on the toxin genes and toxin-producing ability.
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KEYWORD
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Bacillus thuringiensis, enterotoxin, toxin gene, safety
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