근권에 존재하는 Bacillus 속 균주들의 식물 생장 촉진 활성 특성
Plant Growth-Promoting Activity Characteristics of Bacillus Strains in the Rhizosphere
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본 연구에서는 토양 및 근권에 존재하는 Bacillus 속의 식물 생장 촉진 활성, 식물 병원성 곰팡이의 생장 억제활성, 미네랄 가용화능 및 세포 외 효소활성을 확인해 보고자 하였다. 식물 병원성 곰팡이에 대한 항진균 활성에서 DDP257은10종의 병원성 곰팡이에서 항진균 활성이 모두 나타났다. 식물 생장 촉진 인자인 indole-3-acetic acid 생성능에서는ANG20이 70.97 μg/ml로 가장 높게 나타났다. 추가적으로 1- aminocyclopropane-1-carboxylate deaminase 생성능 조사에서는 총 10종에서 생성능을 확인하였고, 질소 고정능과siderophore 생성능 조사에서는 대부분의 분리균주에서 활성을 확인하였다. 이후 분리된 균주에 대하여 phosphate, calcite, zinc과 같은 미네랄 가용화능을 확인하였으며 세포외 효소활성에서도 대부분의 효소에서 활성이 나타났다. 특히 alkaline phosphatase, esterase (C4), acid phosphatase, naphtol-AS-BI-phosphohydrolase에서 선별된 균주 모두 유사한 활성을 보였다. 이는 Bacillus 속이 다양한 유기물과 항생물질 및 세포 외 효소를 분비함으로써 이러한 결과가 나타난 것으로 판단된다. 따라서, 본 연구 결과를 통해 토양의환경 개선에 기여하는 균주를 활용하여 미생물 제제로써의 가능성을 제시한다.
Abstract
This study aimed to identify plant growth-promoting activity, phytopathogenic fungi growth inhibitory activity, mineral solubilization ability, and extracellular enzyme activity of the genus Bacillus in soil and the rhizosphere. With regards to antifungal activity against phytopathogenic fungi, DDP257 showed antifungal activity against all 10 pathogenic fungi tested. ANG20 showed the highest ability to produce indole- 3-acetic acid, a plant growth-promoting factor (70.97 μg/ml). In addition, 10 species were identified to have 1-aminocyclopropane-1-carboxylate deaminase production ability, and most isolates showed nitrogen fixation and siderophore production abilities. Thereafter, the isolated strains’ ability to solubilize minerals such as phosphate, calcite, and zinc was identified. With extracellular enzyme activity, the activity appeared in most enzymes. In particular, all the strains showed similar abilities for alkaline phosphatase, esterase (C4), acid phosphatase, and naphtol-AS-BI-phosphohydrolase production. This result was observed because the genus Bacillus secreted various organic substances, antibiotics, and extracellular enzymes. Therefore, through the results of this study, we suggest the possibility of using strains contributing to the improvement of the soil environment as microbial agents.
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