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옥수수와 톨페스큐 근권 유래의 메탄 산화 및 아산화질소 환원 세균 컨소시움 특성

Characterization of CH4-oxidizing and N2O-reducing Bacterial Consortia Enriched from the Rhizospheres of Maize and Tall Fescue

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초록

옥수수(Zea mays)와 톨페스큐(Festuca arundinacea) 근권 토양을 접종원으로 사용하여 농화배양을 통해 CH4 산화컨소시움과 N2O 환원 컨소시움을 얻었다. Illumina MiSeq 염기서열 분석법으로 접종원과 컨소시움의 세균 군집 특성을 비교하였고, 컨소시움의 CH4 산화와 N2O 환원 활성에 미치는 뿌리삼출물의 영향을 규명하였다. 접종원이 다름에도불구하고 옥수수와 톨페스큐 유래 CH4 산화 컨소시움 사이의 유사성이 높았고, 2종의 N2O 환원 컨소시움도 서로 유사성이 높았다. 2종의 CH4 산화 컨소시움에서 우점도가 높은metanotrophs는 Methylosarcina, Methylococcus 및Methylocystis이었다. 2 종의 N2O 환원 컨소시움에서 대표적인 N2O 환원 세균은 Cloacibacterium, Azonexus 및Klebsiella이었다. 옥수수 근권 유래 N2O 환원 컨소시움의N2O 환원 속도는 옥수수 뿌리삼출물 첨가에 의해 1.6배, 톨페스큐 유래 컨소시움의 N2O 환원 속도는 톨페스큐 뿌리삼출물 첨가에 의해 2.7배 향상되었다. 그러나 CH4 산화 컨소시움의 활성은 뿌리삼출물 첨가에 의해 향상되지 않았다. 본연구의 옥수수 및 톨페스큐 근권 유래 CH4 산화 및 N2O 환원 컨소시움은 유류 오염 정화과정에서 non-CO2 온실가스배출을 저감하는데 활용 가능하다.

Abstract

CH4-oxidizing and N2O-reducing bacterial consortia were enriched from the rhizosphere soils of maize (Zea mays) and tall fescue (Festuca arundinacea). Illumina MiSeq sequencing analysis was performed to comparatively analyze the bacterial communities of the consortia with those of the rhizosphere soils. Additionally, the effect of root exudate on CH4 oxidation and N2O reduction activities of the microbes was evaluated. Although the inoculum sources varied, the CH4-oxidizing and N2O-reducing consortia derived from maize and tall fescue were similar. The predominant methanotrophs in the CH4-oxidizing consortia were Methylosarcina, Methylococcus, and Methylocystis. Among the N2O-reducing consortia, the representative N2Oreducing bacteria were Cloacibacterium, Azonexus, and Klebsiella. The N2O reduction rate of the N2Oreducing consortium from maize rhizosphere and tall fescue rhizosphere increased by 1.6 and 2.7 times with the addition of maize and tall fescue root exudates, respectively. The CH4 oxidization activity of the CH4-oxidizing consortia did not increase with the addition of root exudates. The CH4-oxidizing and N2Oreducing consortia can be used as promising bioresources to mitigate non-CO2 greenhouse gas emissions during remediation of oil-contaminated soils.

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