본 연구의 목적은 Bt 배추의 토양미생물 군집에 미치는 영향을 조사하기 위한 것이다. 토양미생물 조사에 앞서 토양 화학성분을 분석한 결과, Bt 배추와 일반품종 배추 근권토양간 화학성분의 유의성 있는 차이는 없는 것으로 조사되었다. 생육 최대 성숙기의 토양미생물 군집밀도를 조사했을 때 Bt 배추 근권토양의 미생물 군집밀도 범위가 일반 배추 근권토양의 미생물 군집밀도 범위내에 속하는 것으로 나타났다. 월별 DGGE 분석결과 일반품종 배추 근권토양 미생물 군집에 비해 Bt 배추 근권토양 미생물 군집의 변이는 없었다. 형질전환 벡터 유래 유전자부위를 이용하여 유전자의 수평이동성을 조사했을 때 Bt 근권토양 유래 DNA에서는 벡터 유래 유전자가 검출되지 않았다.
The aim of this study was to investigate the possible impact of Bt Chinese cabbage on the soil microbial community. Microbial communities were isolated from the rhizosphere of one Bt Chinese cabbage variety and four varieties of conventional ones and were subjected to be analyzed using both culture-dependent and molecular methods. The total counts of bacteria, fungi, and actinomycetes in the rhizosphere of transgenic and conventional Chinese cabbages were observed to have an insignificant difference. Denaturing gradient gel electrophoresis (DGGE) analysis of PCR-amplified 16S rRNA genes revealed that the bacterial community structures were very similar to each other and this genetic stability of microbial communities was maintained throughout the culture periods. Analysis of dominant isolates in the rhizosphere of transgenic and conventional Chinese cabbages showed that the dominant isolates from the soil of transgenic Chinese cabbage belonged to the Bacilli and Alphaproteobacteria, while the dominant isolates from the soil of conventional cabbage belonged to the Holophagae and Planctomycetacia, respectively. These results indicate that the Bt transgenic cabbage has no significant impact on the soil microbial communities.
