Bacillus thuringiensisに関する微生物生態学的研究 : III.土壤抽出液におけるBacillus thuringiensisの増殖と抽出液pHとの関係

概要

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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 HC1 or 0.1N NaOH and B.thuringiensis (strain AF 101 and subsp. kurstaki) was inoculated. Strain AF 101 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 AF 101 could grow were adjusted to pH 4.5-5.6,the strain could not grow. When soil extracts in which strain AF 101 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 AF 101. 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 AF 101 and at pH 4.8 for subsp. kurstaki.
日本応用動物昆虫学会の論文
1979-11-25