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- W2011724132 abstract "A Brazilian strain of Bacillus thuringiensis subsp. kurstaki, designated S93, was analyzed regarding its cry gene and protein contents and activity against the fall armyworm (Spodoptera frugiperda, Smith 1797). Bioassays using lyophilized powders of S93 or HD-1 and third instar larvae of S. frugiperda showed a 12.3-fold lower LC 50 for the S93 strain when compared with the standard HD-1 strain. The spore-crystal mixture, analyzed by SDS-PAGE, showed two major polypeptides of 130 and 65 kDa, corresponding to Cry1 and Cry2 toxins, respectively. Western blot analysis showed that these proteins were immunologically related to the Cry1A protein from B. thuringiensis subsp. kurstaki HD-73. The polymerase chain reaction technique (PCR) using total DNA from the S93 strain and specific primers showed the presence of cry1Aa, cry1Ab, and cry1Ac genes, and a cry1A-type gene was localized in a plasmid of about 44 MDa. A cry1Ab gene was isolated from a S93 plasmid DNA library and completely sequenced. Computer analysis showed that the gene sequence (GenBank acession number AF059670) is identical to cry1Ab1 and has 91.6 and 85.9% identity with cry1Aa1 and cry1Ac1 genes, respectively. The deduced amino-acid sequence showed a high degree of similarity with the amino-acid sequences of the Cry1Ab1 (100%), Cry1Aa1 (93.8%), and Cry1Ac1 (90.6%) proteins.Key words: Bacillus thuringiensis, Spodoptera frugiperda, biological control, crystal protein, cry genes." @default.
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- W2011724132 date "1999-07-15" @default.
- W2011724132 modified "2023-09-25" @default.
- W2011724132 title "Characterization of<i>Bacillus thuringiensis</i>subsp.<i>kurstaki</i>strain S93 effective against the fall armyworm<i>Spodoptera frugiperda</i>)" @default.
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- W2011724132 doi "https://doi.org/10.1139/w99-032" @default.
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