《Table 2 Bioassay results of Cry57Ab protein against certain insect larvae》

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《A Novel Bacillus thuringiensis Cry57 Protein Domain Swap Influence on Insecticidal Activity》

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In this study，the preliminary insecticidal activity of protein Cry57Ab was conducted.The protein concentration in screening test was set at 100μg·m L-1（Luo et al.，1999；Wang et al.，2007；Wang et al.，2008），and each treatment was repeated three times with 10 mmol·L-1 Tris-Cl used as a negative control.Results of screening are shown in Table 2.The death rates of Helicoverpa armigera and Spodoptera exiguacaused by protein Cry57Ab were less than 10%both after treated，indicating that the protein Cry57Ab had few insecticidal activity against Helicoverpa armigera and Spodoptera exigua.As for Ostrinia furnacalis，the death rate was 10.0%，and Plutella xylostella was 13.4%，indicating that the protein Cry57Ab had slight insecticidal activity against them.