• Title/Summary/Keyword: 토양미생물군집 활성도

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Soil Microbial Community Analysis using Soil Enzyme Activities in Red Pepper Field Treated Microbial Agents (토양효소활성을 이용한 미생물제제 처리 고추경작지의 토양미생물군집 분석)

  • Kim, Yo-Hwan;Lim, Jong-Hui;An, Chang-Hwan;Jung, Byung-Kwon;Kim, Sang-Dal
    • Journal of Applied Biological Chemistry
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    • v.55 no.1
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    • pp.47-53
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    • 2012
  • Increasing concerns over green farming technology, plant growth promoting rhizobacterium (PGRP) having growth promoting as well as plant disease suppressing properties was recently preferred to use for biological control of plant pathogens infecting plant. We measured the influence of the selected microbial consortium agents-a mixture of PGPR strains-, commercial bio-fungicide, and chemical pesticides on soil microbial community in red pepper field. The activities of soil enzyme such as dehydrogenase, urease, phosphatase, ${\beta}$-glucosidase, and cellulase were analyzed to investigate that of soil microbial community. We also measured plant length, main stem, stem diameter, number of branches and yields of red-pepper in order to observe the red pepper growth promotion. The results of measuring enzyme activities were dehydrogenase 3.5584 ${\mu}g$ TPF $g^{-1}h^{-1}$, urease 15.8689 ${\mu}g$ $NH_4{^-}N$ $g^{-1}h^{-1}$, phosphatase 0.5692 ${\mu}g$ PNP $g^{-1}h^{-1}$, ${\beta}$-glucosidase 2.4785 ${\mu}g$ PNP $g^{-1}h^{-1}$, and cellulase 86.1597 ${\mu}g$ glucose $g^{-1}h^{-1}$ in the soil treated with the microbial consortium agents, so it came out to be very active in the soil. Observing the growth of red-peppers, the main-stem length and the stem diameter were 6.1% and 8.1% higher in the soil treated with the selected microbial consortium agent than the chemical pesticides. After harvesting, yields were 7.3% higher in the soil treated with selected microbial consortium agents than the chemical pesticides. These results showed that microbial consortium agents contribute to increasing soil microbial diversity, growth promoting, and yield of red pepper.

Metaproteomics in Microbial Ecology (메타프로테오믹스의 미생물생태학적 응용)

  • Kim, Jong-Shik;Woo, Jung-Hee;Kim, Jun-Tae;Park, Nyun-Ho;Kim, Choong-Gon
    • Korean Journal of Microbiology
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    • v.46 no.1
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    • pp.1-8
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    • 2010
  • New technologies are providing unprecedented knowledge into microbial community structure and functions. Even though nucleic acid based approaches provide a lot of information, metaproteomics could provide a high-resolution representation of genotypic and phenotypic traits of distinct microbial communities. Analyzing the metagenome from different microbial ecosystems, metaproteomics has been applied to seawater, human guts, activated sludge, acid mine drainage biofilm, and soil. Although these studies employed different approaches, they elucidated that metaproteomics could provide a link among microbial community structure, function, physiology, interaction, ecology, and evolution. These approaches are reviewed here to help gain insights into the function of microbial community in ecosystems.

Analysis of Community Level Physiological Profiles in the Rhizosphere of Brassica rapa subsp. pekinensis (Brassica rapa subsp. pekinensis 근권 서식 미생물의 기질이용 활성 조사)

  • Jung, Se-Ra;Kim, Seung-Bum
    • Korean Journal of Environmental Biology
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    • v.26 no.1
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    • pp.42-46
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    • 2008
  • The community size of culturable heterotrophic bacteria and community level physiological profiles (CLPP) in the rhizosphere of Brassica rapa subsp. pekinensis (Chinese cabbage) were analyzed in two different sites. The average community size of culturable heterotrophic bacteria ranged between $2.65\times10^6CFU\;g^{-1}$ soil (Suwon) and $3.75\times10^6CFU\;g^{-1}$ soil (Yesan), whereas those of bulk soils ranged between $2.45\times10^6CFU\;g^{-1}$ soil (Suwon) and $2.97\times10^6CFU\;g^{-1}$ soil (Yesan). The average functional richness of Suwon rhizoshpere was 90.8, whereas that of Yesan rhizosphere was 154.1. High level of correlation was found between the community size and functional richness. The most actively utilized substrates in both rhizospheres were adonitol, L-asparagine, D-gluconic acid, L-glutamic acid and D-galacturonic acid. Clear differences were seen in the utilization patterns between the two sites. Differences were also observed for the patterns of bulk soils between the two sites, although D-raffinose and D-mannose were found as the commonly utilized substrates.

Effect of Temperature Condition on Nitrogen Mineralization of Organic Matter and Soil Microbial Community Structure in non-Volcanic Ash Soil (온도가 유기물의 질소무기화와 미생물 군집구조에 미치는 영향)

  • Joa, Jae-Ho;Moon, Kyung-Hwan;Kim, Seong-Cheol;Moon, Doo-Gyung;Koh, Sang-Wook
    • Korean Journal of Soil Science and Fertilizer
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    • v.45 no.3
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    • pp.377-384
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    • 2012
  • This study was carried out to evaluate effect of temperature condition on nitrogen mineralization of organic matter, distribution of microbial group by PLFA profiles, and soil microbial community in non-volcanic ash soil. Dried soil 30 g mixed well each 2 g of pellet (OFPE) organic fertilizers, pig manure compost (PMC), and food waste compost (FWC). And then had incubated at $10^{\circ}C$, $20^{\circ}C$, and $30^{\circ}C$, respectively. Nitrogen mineralization rate increased with increasing temperature and that was in the order of FWC>OFPE>PMC. Distribution ratio of microbial group by PLFA profiles showed that was different significantly according to incubation temperature and the type of organic matter. As incubating time passed, density of microbial group decreased gradually. The Gram-bacteria PLFA/Gram+ bacteria PLFA, Fungi PLFA/Bacteria PLFA, and Unsaturated PLFA/saturated PLFA ratios were decreased according to the increasing temperature gradually. Principal component analysis using PLFA profiles showed that microbial community structures were composed differently by temperature factor at both 75 days ($10^{\circ}C$) and 270 days ($30^{\circ}C$). In conclusion, Soil microbial community structure showed relative sensitivity and seasonal changes as affected by temperature and organic matter type.

Characterization of microbial communities and soil organic carbon degradation associated with the depth and thawing effects on tundra soil in Alaska (Alaska 툰드라 토양의 깊이 및 해동 영향에 따른 미생물 군집과 토양 유기 탄소 분해 특성)

  • Park, Ha Ju;Kim, Dockyu;Park, Hyun;Lee, Bang Yong;Lee, Yoo Kyung
    • Korean Journal of Microbiology
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    • v.52 no.3
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    • pp.365-374
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    • 2016
  • In high-latitude regions, temperature has risen ($0.6^{\circ}C$ per decade) and this leads to the increase in microbial degradability against soil organic carbon (SOC). Furthermore, the decomposed SOC is converted into green-house gases ($CO_2$ and $CH_4$) and their release could further increase the rate of climate change. Thus, understanding the microbial diversity and their functions linked with SOC degradation in soil-thawing model is necessary. In this study, we divided tundra soil from Council, Alaska into two depth regions (30-40 cm and 50-60 cm of depth, designated as SPF and PF, respectively) and incubated that for 108 days at $0^{\circ}C$. A total of 111,804 reads were obtained through a pyrosequencing-based metagenomic study during the microcosm experiments, and 574-1,128 of bacterial operational taxonomic units (OTUs) and 30-57 of archaeal OTUs were observed. Taxonomic analysis showed that the distribution of bacterial taxa was significantly different between two samples. In detail, the relative abundance of phyla Actinobacteria and Firmicutes largely increased in SPF and PF soil, respectively, while phyla Crenarchaeota was increased in both soil samples. Weight measurement and gel permeation chromatography of the SOC extracts demonstrated that polymerization of humic acids, main component of SOC, occurred during the microcosm experiments. Taken together our results indicate that these bacterial and archaeal phyla could play a key function in SOC degradation and utilization in cold tundra soil.

Evaluation of Microbial PCE Reductive Dechlorination Activity and Microbial Community Structure using PCE-Contaminated Groundwater in Korea (사염화에틸렌(PCE)으로 오염된 국내 4개 지역 지하수 내 생물학적 PCE 탈염소화 활성 및 미생물 군집의 비교)

  • Kim Young;Kim Jin-Wook;Ha Chul-Yoon;Kwon Soo-Yeol;Kim Jung-Kwan;Lee Han-Woong;Ha Joon-Soo;Park Hoo-Won;Ahn Young-Ho;Lee Jin-Woo
    • Journal of Soil and Groundwater Environment
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    • v.10 no.2
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    • pp.52-58
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    • 2005
  • In Korea, little attention has been paid to microbial perchloroethylene (PCE) and/or trichloroethylene (TCE) dechlorination activity and identification of microorganisms involved in PCE reductive dechlorination at a PCE-contaminated aquifer. We performed microcosm tests using the groundwater samples from 4 different contaminated sites (i.e. Changwon A, Changwon B, Bucheon and Yangsan) to assess PCE reductive dechlorination activity. We also adapted molecular techniques to screen what types of known reductive dechlorinators are present at the PCE-contaminated aquifers. In the Changwon A and Changwon B active microcosms where potential electron donors such as sodium propionate, sodium lactate, sodium butyrate, and sodium fumarate, were added, ethylene, an end-product of complete reductive dechlorination of PCE, was detected after a period of 90 days of incubation. In the Bucheon and Yangsan active microcosms, cis-1,2-dichloroethylene (c-DCE) was accumulated without the production of vinyl chloride (VC) and ethylene. Molecular techniques were used to evaluate the microbial community structures in the Changwon B and Yangsan aquifer. We found two sequence types that were closely related to a known PCE to ethylene dechlorinator, named uncultured bacterium clone DCE47, in the Changwon B site clone library. However, in the Yangsan site clone library, no sequence type was closely related to known PCE dechlorinators reported. It is plausible that microorganisms being capable of completely dechlorinating PCE to ethylene may be present in the Changwon B site aquifer. In this study we find that complete PCE reductive dechlorinators are present at some PCE-contaminated sites in Korea. In an engineering point of view this information makes it feasible to apply a biological reductive dechlorination process for remediating PCE- and/or TCE-contaminated aquifers in Korea.

Effect of the Long-term Application of Organic Matters on Microbial Diversity in Upland Soils (유기물 장기 연용이 밭토양 미생물의 다양성에 미치는 영향)

  • Suh, Jang-Sun;Kwon, Jang-Sik;Noh, Hyung-Jun
    • Korean Journal of Soil Science and Fertilizer
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    • v.43 no.6
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    • pp.987-994
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    • 2010
  • To investigate the effect of long term application of organic matter in upland soils, plots for treatments of NPK, NPK+pig manure compost, rape seed cake, rice straw compost, and green manure were set up. Populations of Bacillus and Gram negative bacteria were high in the plot treated with green manure application, but microbial biomass was increased with chemical fertilizer or pig manure compost in upland soils. Activities of phosphomonoesterase and dehydrogenase were high with organic matter application comparing to control. Cluster patterns analysed using phospholipid fatty acid of plots treated with rice straw and or pig manure compost were clearly different comparing with other treatments. Dominant bacteria in upland soils were Bacillus flexus, B. subtilis and B. megaterium. And the strains isolated from upland soils had amylase, protease and lipase activities.

Interaction Between Plants and Rhizobacteria in Phytoremediation of Heavy Metal- Contaminated Soil (중금속 오염 토양의 식물상 복원에 있어 식물과 근권세균의 상호작용)

  • Koo So-Yeon;Cho Kyung-Suk
    • Microbiology and Biotechnology Letters
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    • v.34 no.2
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    • pp.83-93
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    • 2006
  • In heavily industrialized areas, soil sites are contaminated with high concentrations of heavy metals. These pollutants are highly accumulated to the human body through the food web and cause serious diseases. To remove heavy metals from the soil, a potential strategy is the environmental friendly and cost effective phytoremediation. For the enhancement of remediation efficiency, the symbiotic interaction between the plant and plant growth-promoting rhizobacteria (PGPR) has been attended. In this review, the interaction of the plant and PGPR in the heavy metal-contaminated soil has been reviewed. The physicochemical and biological characteristics of the rhlzosphere can influence directly or indirectly on the biomass, activity and population structure of the rhizobacteria. The root exudates are offered to the soil microbes as useful carbon sources and growth factors, so the growth and metabolism of rhizobacteria can be promoted. PGPR have many roles to lower the level of growth-inhibiting stress ethylene within the plant, and also to provide iron and phosphorus from the soil to plant, and to produce phytohormone such as indole acetic acid. The plant with PGPR can grow better in the heavy metal contaminated soil. Therefore higher efficiency of the phytoremediation will be expected by the application of the PGPR.

Diversity and Antimicrobial Activity of Actinomycetes Isolated from Rhizosphere of Rice (Oryza sativa L.) (벼 근권에서 분리한 방선균의 다양성과 항균 활성)

  • Lee, Hye-Won;Ahn, Jae-Hyung;Weon, Hang-Yeon;Song, Jaekyeong;Kim, Byung-Yong
    • The Korean Journal of Pesticide Science
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    • v.17 no.4
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    • pp.371-378
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    • 2013
  • Various microorganisms live in soil, of which those colonizing rhizosphere interact with nearby plants and tend to develop unique microbial communities. In this study, we isolated diverse actinomycetes from rhizosphere of rice (Oryza sativa L.) cultivated in fertilized (APK) and non-fertilized (NF) paddy soils, and investigated the diversity and antimicrobial activity of them. Using four kinds of selective media, 152 isolates were obtained from the soil samples and identified by determining 16S rRNA gene sequence. All of the isolates showed 99.0%~100.0% similarities with type strains and were classified into six genera: Dactylosporangium, Micromonospora, Kitasatospora, Promicromonospora, Streptomyces and Streptosporangium. Most of the isolates, 143 isolates, were classified into the genus Streptomyces. Additionally, many isolates had antimicrobial activity against plant pathogens, especially Magnaporthe oryzae (rice blast pathogen) in fungi. These findings demonstrated that rice rhizosphere can be a rich source of antagonistic actinomycetes producing diverse bioactive compounds.

Characteristics of Microbial Community Enzyme Activity and Substrate Availability of Damaged Soil (훼손 토양의 미생물군집 효소 활성과 기질 이용성 특성)

  • Ji Seul Kim;Gyo-Cheol Jeong;Myoung Hyeon Cho;Eun Young Lee
    • Journal of Soil and Groundwater Environment
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    • v.28 no.5
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    • pp.68-77
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    • 2023
  • The effect of soil damage on the physicochemical characteristics and activity of the soil microbial community is not well known. This study investigates this relationship by analyzing 11 soil samples collected from various points of soil damage across Gyeonggi-do. Soil damage resulted from forest fires, landslides, and development areas, with their impacts most severe on the topsoil layer (0-30 cm). Dehydrogenase and β-glucosidase activities were notably higher at locations damaged by forest fires compared to other sites. While enzyme activities in soils influenced by landslides and development areas were relatively low, sites with a pollution history exhibited elevated dehydrogenase activity, likely due to past microbial response to the pollution. Additionally, an assessment of carbon substrate usability by soil microorganisms indicated higher substrate availability in areas impacted by forest fires, contrasting with lower availability in landslide and development sites. Statistical analysis revealed a positive correlation between organic content of sand and clay and microbial activity. These findings provide valuable insights into soil damage and associated restoration research, as well as management strategies.