환경스트레스와 관련된 indole-3-acetic acid 및 1-aminocylopropane-1-carboxylyic acid deaminase 활성을 갖는 박테리아의 분리와 특성 연구
Isolation and Characterization of Indole-3-acetic acid- and 1-aminocylopropane-1-carboxylyic Acid Deaminase-producing Bacteria Related to Environmental Stress
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본 연구에서 부산, 창원, 제주도 일대에서 채취한 토양으로부터 분리한 미생물을 이용하여 식물 생장 촉진활성 및 식물병원성 곰팡이에 대한 길항능을 확인하고자 하였으며, 분리주 간에 비교우위를 통해 Pseudomonas plecoglossicida ANG14, Pseudarthrobacter equi ANG28, Beijerinckia fluminensis ANG34, Acinetobacter calcoaceticus ANG35 를 최종 선정하였다. 이들은 ACC deaminase 생성능, IAA 생성능, 질소 고정능, 인산 가용화능 및 siderophore 생성능을 모두 가지며, 일부 식물병원성 곰팡이에 대해 길항능을가지는 것을 확인하였다. 특히 ANG35의 경우에는 7가지 식물병원성 곰팡이 중 6가지에 대해 비교적 높은 억제율을 나타내어 식물 생장 촉진뿐만 아니라 방제활성을 가지므로 식물이 생장하는 데 도움을 줄 것으로 기대된다. 또한, 4균주간의 세포외 효소활성 synergy effect를 확인한 결과 단독배양을 했을 때보다 혼합배양 시 세포외 효소활성이 증가하는것을 확인하였다. 따라서, 식물 생장촉진 활성 및 식물병원성 곰팡이에 대한 결과를 통해 새로운 생물학적 제제로서 이용 가능성을 제시한다.
Abstract
In this study, strains isolated from soil samples collected from Busan, Changwon, and Jeju Island were examined to verify their abilities of phosphate solubilization and nitrogen fixation, production of indole-3- acetic acid (IAA), siderophore, and 1-aminocylopropane-1-carboxylyic acid (ACC) deaminase in order to select strains that promote plant growth and play a role in biocontrol of pests or pathogens. According to the results of this study, most of the isolated strains were found to have ability of phosphate solubilization, nitrogen fixation, IAA production, siderophore production, and production of ACC deaminase. These isolated strains might help plant growth by directly improving absorption of nutrients essential for phosphate solubilization and nitrogen fixation. In addition, they can promote plant growth and control resistance to plant diseases through extracellular enzyme activity and antifungal activity. In addition, most of the selected strains were found to survive in various environmental conditions such as temperature, salinity, and pH. Therefore, Pseudomonas plecoglossicida ANG14, Pseudarthrobacter equi ANG28, Beijerinckia fluminensis ANG34, and Acinetobacter calcoaceticus ANG35 were finally selected through a comparative advantage analysis to suggest their potential as novel biological agents. Further studies are necessary in order to prove their efficacy as novel biological agents through formulation and optimization of effective microorganisms, their preservation period, and crop cultivation tests.
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