Distribution of Bacillus thuringiensis in the complex of spore-forming bacteria of the genus Bacillus Cohn in the soils of the nut-fruit forests of southern Kyrgyzstan.

摘要

Three-year-long investigation of the microflora in the soil of nut-fruit forests in the south of Kyrgyzstan showed a wide distribution of spore-forming bacteria Bacillus subtilis, B. cereus, B. idosus, and B. megaterium. In the complex of these bacteria, crystal-forming bacteria B. thuringiensis are abundant. The occurrence of B. thuringiensis in mountain-forest black-brown soils reaches 80% of soil samples. Dominating subspecies are tohokuensis (H17), israelensis (H14), and toguchini (H31). Abundance of B. thuringiensis was insignificant and accounted for only 1% of spore-forming bacteria. The abundance B. thuringiensis in oozy biocenoses on the shores of water bodies within the Sary-Chelek Biosphere Reserve reaches 12.6-18.0% of soil-forming bacteria. Thus, it is possible to assume that B. thuringiensis not only are conserved in soils but also can reproduce.