Diversity of Bacillus thuringiensis in the rice field soils of different ecologies in India |
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Authors: | J Das T K Dangar |
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Institution: | (1) Microbiology Laboratory, Division of Crop Production, Central Rice Research Institute, Cuttack, 753 006, Orissa, India |
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Abstract: | Diversity of the Bacillus thuringiensis (Bt) in the rice field soils of different ecologies viz. the island (Port Blair), the Himalayan (Srinagar), brackish water
(Mahe) and coastal mesophilic (Mangalore) habitats was analyzed by phenotypic characterization of 5, 66, 14 and 54 Bt isolates,
respectively. The Bt isolates produced either monotypic (bipyramidal or spherical) or heterotypic (polymorphic-bipyramidal
or bipyramidal-rhomboidal) crystals. The organisms were generally resistant to the penicillin group of antibiotics, tolerated
5–12% NaCl and 0.5M Na-acetate. The Bt isolates contained 1–5 plasmids of 0.89–58.61 kbp sizes. The plasmid profiles had no
correlation with crystal morphology or salt tolerance of different bacteria. Each soil was inhabited by different types of
Bt. Two Bt strains of Mangalore and one strain each of the other places were phenotypically similar. One Bt strain each of
Port Blair and Srinagar was different from all other strains. |
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Keywords: | Bacillus thuringiensis Diversity Plasmid Rice Salt tolerance |
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