Characterization of Flagellar Antigens and Insecticidal Activities of Bacillus thuringiensis Populations in Animal Feces |
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Authors: | Dong-Hyun Lee Noriko Shisa Naoya Wasano Akira Ohgushi Michio Ohba |
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Affiliation: | (1) Graduate School of Agriculture, Kyushu University, Fukuoka 812-8581, Japan, JP |
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Abstract: | In total, 287 Bacillus thuringiensis isolates, recovered from feces of 28 zoo-maintained animal species, were examined for flagellar (H) antigenicity and insecticidal activity. Serologically, 209 isolates (72.8%) were allocated to the 8 H serogroups, 4 were untypable, and 74 were untestable. Among the 8 H serotypes detected, H3abc (serovar kurstaki) predominated at a high frequency of 88.0%, followed by H6 (serovar entomocidus) with a frequency of 7.7%. Insecticidal activity was associated with 67.2% of the fecal populations: 188 isolates were toxic to both Bombyx mori (Lepidoptera: Bombycidae) and Aedes aegypti (Diptera: Culicidae), 2 isolates were specific for B. mori, and 3 isolates were toxic to A. aegypti only. Of the isolates with dual toxicity, 97.9% belonged to the serovar kurstaki, producing bipyramidal parasporal inclusions. All of the H7 (serovar aizawai) isolates were toxic to both insects. Received: 4 June 2002 / Accepted: 5 July 2002 |
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