Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Biochemical and cultural characteristics of mineral-solubilizing Acinetobacter sp. DDP346

미네랄 가용화능을 갖는 Acinetobacter sp. DDP346의 생화학적 및 배양학적 특성

  • Received : 2021.07.22
  • Accepted : 2021.09.23
  • Published : 2021.12.31
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Abstract

In this study, to select strains suitable as microbial agent from among rhizosphere microorganisms present in rhizosphere soil and roots, the mineral solubilization ability, antifungal activity against 10 types of plant pathogenic fungi, and plant growth-promoting activity of rhizosphere microorganisms were evaluated. As a result, DDP346 was selected because it has solubilization ability of phosphoric acid, calcium carbonate, silicon, and zinc; nitrogen fixing ability; production ability of siderophore, indole-3-acetic acid, and aminocyclopropane-1-carboxylate deaminase; and antifungal activity against seven types of plant pathogenic fungi. DDP346 showed a 99.9% homology with Acinetobacter pittii DSM 21653 (NR_117621.1); phylogenetic analysis also revealed a close relationship with Acinetobacter pittii based on the 16S rRNA base sequence. The growth conditions of DDP346 were identified as temperatures in the range of 10-40 ℃, pH in the range of 5-11, and salt concentrations in the range of 0-5%. In addition, a negative correlation coefficient (r2 = -0.913, p <0.01) was shown between pH change and the solubilized phosphoric acid content of Acinetobacter sp. DDP346, and this is assumed to be due to the organic acid generated during culture. Consequently, through the evaluation of its mineral solubilization ability, antifungal activity against plant pathogenic fungi, and plant growth-promoting activity, the potential for the utilization of Acinetobacter sp. DDP346 as a multi-purpose microbial agent is presented.

본 연구는 근권 토양 및 뿌리에 존재하는 근권 미생물 중 미생물 제제로 적합한 균주를 선별하기 위해서 미네랄 가용화능, 10종의 식물 병원성 곰팡이에 대한 항진균 활성 및 식물 생장 촉진 활성을 평가하였다. 결과적으로 불용성 인산, 탄산칼슘, 규소 및 아연 가용화능과 질소고정능, siderophore, indole-3-acetic acid와 aminocyclopropane-1-carboxylate deaminase 생성능 및 7종의 식물 병원성 곰팡이에 대해 항진균 활성을 갖는 DDP346을 선별하였다. 선별된 DDP346은 Acinetobacter pittii DSM21653 (NR_117621.1)와 99.9% 이상의 높은 상동성을 보였으며, 16S rRNA 염기서열을 바탕으로 계통도를 분석한 결과에서도 Acinetobacter pittii와 높은 유연관계를 나타내었다. DDP346의 생장 조건은 온도(10-40 ℃), pH (5-11) 염농도(0-5%) 범위로 확인하였다. 또한 pH 변화와 가용화된 인산 함량 간에 음의 상관계수(r2= -0.913, p <0.01)를 나타내는 것을 확인하였는데, 이는 배양 중에 생성되는 유기산에 의한 것으로 추정된다. 결과적으로 미네랄 가용화능, 식물 병원성 곰팡이에 대한 항진균 활성 및 식물 생장 촉진 활성 평가를 통해 Acinetobacter sp. DDP346을 다목적 미생물 제제로써 활용 가능성을 제시한다.

Keywords

References

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