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Isolation and Identification of a nitrite-oxidizing Bacterium from Hepu County

Agricultural Biotechnology 2015年第4期4卷 42-43,46页

作者： Yulong CHEN Ling SHEN Jintao LI Qin HU Qingzong DAI Sichuan Preschool Educators' College Genetic Engineering Research Center School of Life ScienceChongqing University Beijing Key Laboratory of Environmental and Viral Oncology College of Life Science and BioengineeringBeijing University of Technology State Key Laboratory for Infectious Disease Prevention and Control National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention

In order to select the strain that can degrade nitrite, the screening plate with nitrite was used as the sole nitrogen source to screen the strain with ability to degrade nitrite. A strain with nitrite degrading capacity was isolated from the sludge of a shrimp-farming pond in Hepu City, Guangxi Zhuang Autonomous Region. The isolated strain was identified based on colonial morphology, physiological and biochemical characteristics, and 16S rRNA sequence. Results showed that the strain could grow well on the culture medium containing 2.3 g/L nitrite. According to the morphological characteristics, nitrogen source requirements and evolutionary tree of the 16S rRNA sequence, the isolated strain was identified as Acinetobacter radioresistens, which was named HPAR132 strain. This study laid the foundation for further investigation of nitrite-oxidizing bacterium HPAR132.

关键词： nitrite-oxidizing Acinetobacter radioresistens Strain screening

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Evidence for niche differentiation of nitrifying communities in grassland soils after 44 years of different field fertilization scenarios

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Pedosphere 2020年第1期30卷 87-97页

作者： Zhongjun JIA Xue ZHOU Weiwei XIA Dario FORNARA Baozhan WANG Elizabeth Anne WASSON Peter CHRISTIE Martin F.POLZ David D.MYROLD State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098(China) Jiangsu Key Laboratory of Agricultural Meteorology College of Applied MeteorologyNanjing University of Information Science and TechnologyNanjing 210044(China Agri-Food and Biosciences Institute Belfast BT95PX(UK) Department of Civil and Environmental Engineering Massachusetts Institute of TechnologyCambridge MA 02139(USA) Department of Crop and Soil Science Oregon State UniversityCorvallis OR 97331(USA)

Long-term nitrogen(N)fertilization imposes strong selection on nitrifying communities in agricultural soil,but how a progressively changing niche affects potentially active nitrifiers in the field remains poorly *** a 44-year grassland fertilization experiment,we investigated community shifts of active nitrifiers by DNA-based stable isotope probing(SIP)of field soils that received no fertilization(CK),high levels of organic cattle manure(HC),and chemical N fertilization(CF).Incubation of DNA-SIP microcosms showed significant nitrification activities in CF and HC soils,whereas no activity occurred in CK *** 44 years of inorganic N fertilization selected only 13C-ammonia-oxidizing bacteria(AOB),whereas cattle slurry applications created a niche in which both ammonia-oxidizing archaea(AOA)and AOB could be *** analysis indicated that Nitrosospira sp.62-like AOB dominated inorganically fertilized CF soils,while Nitrosospira sp.41-like AOB were abundant in organically fertilized HC *** 13C-AOA in HC soils were affiliated with the 29i4 *** 13C-nitrite-oxidizing bacteria(NOB)were dominated by both Nitrospira-and Nitrobacter-like communities in CF soils,and the latter was overwhelmingly abundant in HC *** 13C-labeled nitrifying communities in SIP microcosms of CF and HC soils were largely similar to those predominant under field *** results provide direct evidence for a strong selection of distinctly active nitrifiers after 44 years of different fertilization regimes in the *** findings imply that niche differentiation of nitrifying communities could be assessed as a net result of microbial adaption over 44 years to inorganic and organic N fertilization in the field,where distinct nitrifiers have been shaped by intensified anthropogenic N input.

关键词： ammonia-oxidizing archaea ammonia-oxidizing bacteria community shift long-term fertilization nitrite-oxidizing bacteria nitrogen enrichment stable isotope probing microcosm

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