Microbial Ecological Studies on <i>Bacillus thuringiensis</i> III.

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  • ?EＢａｃｉｌｌｕｓ　ｔｈｕｒｉｎｇｉｅｎｓｉｓ?Fに関する微生物生態学的研究　ＩＩＩ　　土壌抽出液における?EＢ．ｔｈｕｒｉｎｇｉｅｎｓｉｓ?Fの増殖と抽出液ｐＨとの関係
  • Bacillus thuringiensis ニ カンスル ビセイブツ セイタ
  • III. 土壤抽出液における<i>Bacillus thuringiensis</i>の増殖と抽出液pHとの関係

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Abstract

The effect of pH of soil extracts on the growth of Bacillus thuringiensis was investigated in 8 soil samples from 3 mulberry plantations. PH of soil extracts was adjusted with 0.1N HCl or 0.1N NaOH and B. thuringiensis (strain AF101 and subsp. kurstaki) was inoculated. Strain AF101 could grow in 5 samples of soil extracts with a pH of 6.1-6.7 but could not grow in 3 samples with a pH of 4.5-4.8. When soil extracts in which strain AF101 could grow were adjusted to pH 4.5-5.6, the strain could not grow. When soil extracts in which strain AF101 could not grow were adjusted to pH 5.4-8.5, the strain was able to grow. The growth of subsp. kurstaki in soil extracts showed the same trends as those observed with AF101. It was concluded that B. thuringiensis could not grow when pH of soil extracts was acid and the growth occurred at pH 5.5 for strain AF101 and at pH 4.8 for subsp. kurstaki.

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