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Transcriptome analysis of differential gene expression in Dichomitus squalensduring interspecific mycelial interactions provides insight into its laccase induction

Transcriptome analysis of differential gene expression in Di...

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第二十次全国环境微生物学学术研讨会

作者： Zixuan Zhong Nannan Li Li Liu Huiting Zhang Yasuo Igarashi Deti Xie Feng Luo Research Center of Bioenergy and Bioremediation College of Resources and EnvironmentSouthwest University Beibei Chongqing 400715 China

Interspecific mycelial interactions between white rot fungi are always accompanied by increased production of *** this study,the potential of white rot fungi Dichomitus squalensfor enhancing laccase production during interaction with two other white rot fungi Trametes versicolor or Pleurotus ostreatuswas *** probe the induction mechanism of laccase and the role of laccase played during the combative interaction,we analyzed the laccase induction response to stressful conditions during fungal interaction related to the differential gene expression *** further confirmed the expression patterns of 16 selected genes by qRT-PCR *** noted that many differential expression genes (DEGs) encoding proteins were involved in xenobiotics detoxification and ROS generation or reduction,including aldo/keto reductase,glutathione S-transferases,aldehyde dehydrogenase,cytochrome P450 enzymes,alcohol oxidases,GroEs-like protein and ***,many DEG-encoding proteins were involved in antagonistic mechanisms of nutrient acquisition and antifungal properties,including glycoside hydrolase,alpha/betahydrolase and terpenoid *** analysis effectively revealed that laccase induction was likely caused by protective responses to oxidative stress and nutrient competition during fungal interspecific interaction.

关键词： white rot fungi laccase mycelial interactions Transcriptome analysis Dichomitus squalens

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Dynamics change of soil bacteria and fungi across the mountain vegetation conversion processes

Dynamics change of soil bacteria and fungi across the mounta...

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第二十次全国环境微生物学学术研讨会

作者： Yangying Liu Ye deng CAS Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Sciences C CAS Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Sciences C

Vegetation types change has been recognized as having effect on the soil ***,the microbial dynamics change response to the vegetation conversion processes were still not *** this study,we studied the diversity,community composition and molecular ecological network change mechanisms across the two vegetation conversion types from broad-leaved forest to coniferous forest than to alpine *** soil bacterial diversity and community composition significantly changed during these two vegetation conversion types (P<0.05),the soil bacterial α diversity decreased from broad-leaved forest to coniferous forest,but increased from coniferous forest to alpine *** molecular ecological network revealed that bacterial network complexity increased from broad-leaved forest to coniferous forest,then decreased from coniferous forest to alpine ***,for fungal communities,complexity was gradually increased from broad-leaved forest to coniferous then to alpine *** results showed that bacterial community and fungal community response to different factors related to two vegetation conversion *** bacterial communities were driven by pH,while soil fungal were driven by NO3+-***,vegetation type conversion significantly altered both α diversity,community composition and species interrelationships of soil bacterial and fungal community.

关键词： Vegetation conversion 16S rDNA sequencing Microbial community Network

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Biosynthesisand characterizationofselenium nanoparticles mediated by fungus Mariannaea ***

Biosynthesisand characterizationofselenium nanoparticles med...

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第二十次全国环境微生物学学术研讨会

作者： Xiaofang Pei Ying Yang Liyu Ran Xin Shi XinTian Mingrui Li Bo Zhao YuanyuanQu State Key Laboratory of Fine Chemicals Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China

The biosynthesis of selenium nanoparticles (SeNPs) by *** was reported for the first *** cultural conditions,including SeO2 concentrations and pH were studied,2 mM SeO2 and pH 10 were favorable for the removal of Se(Ⅳ),and extracellular SeNPs were observed in alkaline ***-vis spectroscopy,transmission electron microscopy (TEM),scanning electron microscope (SEM),X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS) were used to characterize *** results showed that removal of Se(Ⅳ) ions occurred during the late exponential phase of strain *** and SEM images revealed that spherical nanoparticles were deposited on the cell war and in the cytoplasmic region of strain HJ with a good size *** pattern suggested the standard hexagonal phase of selenium ***,XPS and selective passivation experiments implicated that carboxyl and amide groups were involved in the formation process and Se(Ⅰ) or Se(Ⅱ) species were demonstrated to be *** on the analyses of SDS,the upregulated proteins of MW ~91.6 and ~37.4-57.2kDa might promote SeNP formation,and a number of proteins adsorbed on the surface of nanoparticles,which may act as a natural stabilizing agent.

关键词： Selenium nanoparticles Mariannaea sp. Biosynthesis Characterization Mechanism

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Treating organic cyanide-containing groundwater by immobilization of a nitrile-degrading bacteriumwith abiofilm-forming bacterium using fluidized bed reactors

Treating organic cyanide-containing groundwater by immobiliz...

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第二十次全国环境微生物学学术研讨会

作者： XuejiaoAn Yi Cheng Mingyan Huang Yueling Sun HailanWang Xi Chen JinmingWang DapengLi ChunyanLi College of Resources and Environment Northeast Agricultural University Harbin 150030Heilongjiang College of Science China Agricultural University Beijing 100083 PR China

Organic cyanide are widely used asan ingredient in the production of plastics,synthetic rubbers,polymers,pharmaceuticalsand pesticides or used in laboratories and industries as *** nitrile-containingwastewateris subjected toprimary and secondary treatments,residual nitriles may slowlyseep and further migrate through groundwater,resulting in the micropollution ofgroundwater byorganic *** this study,water samples were collected from different study areas in North China during a period of three years (from 2013 to 2015) and analyzed to evaluate organic cyanide (CN) contamination in *** parallel lab-scale FBRs were tested for their ability to remove organic cyanide from *** organic cyanide concentration in groundwater increased significantly (P<0.05) from 2013 to *** an optimal hydraulic residence time (HRT) of 54 min,reactor R3 (inoculated with a nitriledegrading bacterium,BX2,and a biofilm-forming bacterium,M1) effectively removed 99.84% of CN under steady operation,which was better than that of other ***-term shutdowns of FBRs had no serious effects on the efficiency ofireating organic *** work demonstrated that the biofilm-forming bacterium could facilitate the fixation of nitrile-degrading bacterium and enhance the efficiency of removing organic cyanide from groundwater.

关键词： Water quality Rhodococcus rhodochrous BX2 Biofilm Immobilization Organic cyanide Groundwater treatment

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Revealing the relationship between the biodiversity and performance in microbial electrolysis cells operated with the diversity gradient

Revealing the relationship between the biodiversity and perf...

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第二十次全国环境微生物学学术研讨会

作者： Zhaojing Zhang Ye Deng Yuanyuan Qu State Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education Chi Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Science Chines State Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education Chi

Understanding the relationship between the biodiversity of microbial communities and ecosystem functioning has been one of the grand challenges among ***,the extremely diverse of natural microbial communities makes it impossible to completely *** electrolysis cells (MEC) especially the anodic biofilm community is an ideal model to explore this relationship within microbial ecosystem due to its moderate complexity,easy controllability and measurable *** this study,we constructed a series of biofilm communities with different biodiversity by diluting the input source community,and applied the high-throughput sequencing of 16S rRNA genes to assess the diversity of anodic microbial communities in *** performances of MEC reactors were monitored,and the high-throughput sequencing of 16S rRNA genes were applied to assess the structures and diversity of microbial communities in MEC *** results demonstrated that biofilms communitieswith a relatively higher α-diversity could obtain a better performance of MEC ***,null model analysis indicated that both deterministic and stochastic processes played important roles in controlling the assembly of the anodic biofilm communities in MECs,but the relative importance of the stochastic processes were decreased substantially with the increasing dilution *** results presented in this study represent important contributions to the understanding of the mechanisms involved in shaping microbial biodiversity,and provide new insights into our understanding of the relationship between diversity and ecosystem functioning.

关键词： Diversity gradient Microbial community assembly Microbial electrolysis cell Biodiversity

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Degradation potential and preliminary metabolic pathway analysis of 17β-estradiol (E2) by Pseudomonas putida M39

Degradation potential and preliminary metabolic pathway anal...

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第二十次全国环境微生物学学术研讨会

作者： Ma Lin Yang Qi Amit Pratush Wu Yi-Rui Huang Tong-Wang Hu Zhong Department of Biology College of Science Shantou University Shantou China

In present study M39 a potential E2 degrader was isolated from deep sea water (depth 208 meter) from South China *** both microbiological and molecular characterization of isolated strain revealed that the isolated bacterial strain was bacillus in shape belongs to genus Pseudomonas,and class *** strain was gram negative in *** optimization of growth media and culture condition results of the M39 strain showed that it exhibited maximum growth and E2 degradation at 25℃C,pH 6 and 3% *** was seen that M39 bacterial cells metabolize E2 best (51%) when gown in the presence of sole carbon sources for 9 *** degradation potential analysis was carried out by *** the E2 metabolism by M39 a new intermediate compound (COA-E1) was observed first time after 6 h of *** compound was not accumulated during the reaction because there was no such compound found in later hrs of same *** presence of this new intermediate compound was confirmed by GC-MS *** study only showed the preliminary results about the finding out the new intermediate compound during E2 transformation to E1.

关键词： Pseudomonas putida M39 17β-E2 Metabolic intermediates South China Sea COA-E1

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Biosynthesis of gold nanoparticles using fungus Trichoderma ***-Go and their catalysis in reduction of 4-nitrophenol and decoloration of azo dyes

Biosynthesis of gold nanoparticles using fungus Trichoderma ...

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第二十次全国环境微生物学学术研讨会

作者： Xuanying Li Hao Feng Ziyi Ju Jian Hui Lu Hangzhou Lu Yuanyuan Qu Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of TechnologyDalian 116024 China

Biological synthesis of gold nanoparticles (AuNPs) has attracted more and more attention due to its advantages of mild conditions,low cost and environment-friendly *** the present study,biosynthesis of gold nanoparticles (AuNPs) by the cell-free extracts of a fungus Trichoderma ***-Go was *** as-synthesized particles were characterized by UV-vis spectroscopy,transmission electron microscopy (TEM).The effects of different parameters on AuNPs biosynthesis were investigated and cell-free extract concentration of 90 mg/L and reacting for 7 days were demonstrated to be suitable for AuNPs *** AuNPs were sphere shapes,with size range of 1-24 nm and an average size of 9.8 *** as-synthesized AuNPs were demonstrated to have good catalytic activities for the reduction of nitro-aromatics (2-Nitrophenol,3-Nitrophenol,4-Nitrophenol,2-Nitroaniline,3-Nitroaniline) with the catalytic rate constants of 7.4×10-3 s-1,10.3×10-3 s-1,4.9×10-3 s-1,5.8×10-3 s-1,15.0×10-3 s-1,***,in decolorization of azo dyes,the AuNPs showed excellent catalytic performance with the decolorization rate of 82.2%-97.5%.The assynthesized AuNPs with small diameter exhibited great potentiality in catalysis and decolorization,which giving AuNPs much value of application.

关键词： Gold nanoparticles Biosynthesis Trichoderma sp. Catalytic activity

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Biosynthesis of indigo by Cupriavidus *** andits functional gene

Biosynthesis of indigo by Cupriavidus *** andits functional ...

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第二十次全国环境微生物学学术研讨会

作者： Shengnan You Yuxin Lin Duandi Zhou Shiqin Long Qi Li Rouyi Wang Yuanyuan Qu Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China

The biosynthesis of indigo has been attracting a huge attention for its increasing *** this study,a novel bacterial strain IDO capable of utilizing indole as sole carbon source was isolated from soil samples and identified as Cupriavidus *** to 16S rRNA sequence *** found that Cupriavidus *** IDO was able to degrade 100 mg/L indole in 12 *** performance liquid chromatographymass spectrometry analysis indicated that indigo was the major products generated during indole *** genomics,proteomics and functional studies were applied to investigate the genetic determinants for indigo biosynthesis in strain Cupriavidus ***.A total of 317 proteins were notably altered (262 up-and 55 downregulated) in the cells growing in indole mineral salt medium with respect to that in sodium citrate *** the related indole oxygenase genes were knocked out,strain IDO was unable to degrade indole and produce ***,the indole oxygenase genes were cloned from strain IDO and successfully expressed in Escherichia coli BL21 (DE3) (designated as ING_IDO).Strain ING_IDO was able to produce 55 mg/L indigo from tryptophan *** optimization of induction time,IPTG concentration and culture medium,indigo production was increased to 110 mg/*** study obtained valuable indole oxygenase and offered the promise of applying strain ING IDO for producing indigo.

关键词： Biotransformation Cupriavidus sp. indole oxygenase metabolic pathway indigo

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Distinct rhizosphere effecton active and total microbial communities in paddy soils

Distinct rhizosphere effecton active and total microbial com...

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第二十次全国环境微生物学学术研讨会

作者： Hu Li Jian-Qiang Su Xiao-Ru Yang Bo-Sen Weng Yong-Guan Zhu Key Lab of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Key Lab of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences

Rhizosphere microbes are critical for plant health and biogeochemical *** the diversity of active microorganisms in the rhizosphere is key to enhancing plant growth and *** examined rhizosphere microbial communities of rice by comparison of the 16S ribosomal subunit amplicons generated from both total (DNA-based,16S rDNA) and active (RNA-based,16S rRNA) soil *** based on 16S rDNA showed high diversity,but with little change in microbial populations across growth *** of 16S rRNA recovered much less diversity,demonstrating that much of the 16S signal was derived from free DNA,dead or inactive *** rRNA analysis showed a stable microbial population present in the rhizosphere,and this was distinct from that in the bulk soil,which was also stable across the growth *** exudates (e.g.,acetate,lactate,oxalate and succinate),as one of major components contributing to rhizosphere effect,appeared to shape the microbial community,with some taxa (e.g.,Oxobacter,Lanchnospiraceae,Coprococcus and α-Proteobacteria) being enhanced in the *** compartment (rhizosphere vs bulk) had a greater effect on microbial communities than did plant phenological stages,especially at the rRNA *** results suggested that rhizosphere effect play key roles in structuring microbial communities in rhizosphere soils with distinct effect on active and total microbial communities.

关键词： rice rhizosphere bacterial community phenological stages RNA DNA root exudates

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Adaptive mechanisms of Sphingobium hydrophobicum C1 to the electronic-waste contaminated sediment

Adaptive mechanisms of Sphingobium hydrophobicum C1 to the e...

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第二十次全国环境微生物学学术研讨会

作者： Da Song Xingjuan Chen Meiying Xu Guoping Sun Jun Guo School of Biology and Biological Engineering South China University of TechnologyGuangzhou 510006 Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application Guangdong Instit

Electronic waste has causedaserious pollution *** the molecular mechanism underlying the bacterial adaption to electronic-waste contaminated environmentcontributetoin-situ ***,little is known about this *** hydrophobicum C1 was previously isolated from electronic-waste contaminated sediment in Guiyu China,and verified to possess favorable phenotypes for adapting to its habitat such as cell surface hydrophobicity,phthalate esters-degrading ability and heavy metal *** sequenced and analyzed the genome of stain C1,and compared it with other 18 Sphingobium representatives to further elucidate the genetic *** C1 genome comprises two chromosomes and five plasmids,and plasmid-like Chromosome 2,plasmids and the genomic islands on Chromosome l carry many genes for environmental *** abundant mobile genetic elements (e.g.,5 plasmids,10 prophages,26 genomic islands and 91 insertion sequences),massive candidate HGT-derived genes and several homologous regions among replicons indicate that strain C1 has undergone high-frequency HGT and rearrangement for adaption to the electronic-waste contaminated *** extensive and exclusive genesfor xenobiotics degradation,toxic pollutant resistance,cell surface hydrophobicity and two-component regulatory systemsprovidesurvival advantages,and the location,organization and homology of some related genes indicate that they may be acquired via horizontal gene *** C1 may serve as a favorable-gene provider to promote adaptive evolution of other strains in the complexly contaminated *** study provides valuable insights into the bacterial adaptive mechanisms of the electronic-waste contaminated sediment and lays the foundation for in-situ bioremediation.

关键词： Sphingobium Genome EvolutionAdaption

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