A Unique Insecticidal Activity in Bacillus thuringiensis Growth Medium

概要

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The supernatant of Bacillus thuringiensis subsp. kurstaki HD-1 culture was found to be toxic against Plutella xylostella, Adoxophyes sp., Bombyx mori and Spodoptera litura. The activity in it against the first three species was substantially lower than that of pellets, but in S. litura activity of supernatant and pellets was similar. A small amount of 130 kDa toxin proteins was found in the concentrated supernatant as well as in pellets by SDS-PAGE. A small amount of solubilized δ-endotoxin seemed to explain the toxicity of the supernatant against the species except S. litura, but in S. litura the toxicity of the supernatant could not be explained by its solubilized toxin protein. When enough supernatant was given to S. litura with pellets, the insecticidal activity became higher than that of the pellets alone. These results strongly suggest that the supernatant might contain some unique factor (s) that enhance the toxicity specific to S. litura.
日本応用動物昆虫学会の論文
1994-02-25