http://www.sciencedirect.com/science/article/pii/S1674987111001344 |
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Authors: | Brian P Hedlund Jessica K Cole Amanda J Williams Weiguo Hou Enmin Zhou Wenjun Li Hailiang Dong |
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Institution: | 1. School of Life Sciences,University of Nevada Las Vegas,Las Vegas,NV 89154-4004,USA 2. School of Life Sciences,University of Nevada Las Vegas,Las Vegas,NV 89154-4004,USA;Geomicrobiology Laboratory,State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;Yunnan Institute of Microbiology,Yunnan University,Kunming 650011,China;Department of Geology; Miami University,Oxford,OH 45056,USA 3. Geomicrobiology Laboratory,State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China 4. Yunnan Institute of Microbiology,Yunnan University,Kunming 650011,China 5. Geomicrobiology Laboratory,State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;Department of Geology; Miami University,Oxford,OH 45056,USA |
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Abstract: | The Rehai Geothermal Field,located in Tengcbong County,in central-western Yunnan Province, is the largest and most intensively studied geothermal held in China.A wide physicochemical diversity of springs(ambient to ~97℃;pH from≤.8 to≥9.3) provides a multitude of niches for extremophilic microorganisms.A variety of studies have focused on the cultivation,identification,basic physiology,taxonomy,and biotechnological potential of thermophilic microorganisms from Rehai.Thermophilic bacteria isolated from Rehai belong to the phyla Firmicutes and Deinococcus-Thenmts. Firmicutes include neutrophilic or alkaliphilic Anoxybacillus,Bacillus,Caldalkalibacillus.Caldanaerobacier, Laceyella,and Geobacillus,as well as thermoacidophilic Alicyclobacillus and Sulfobacillus. Isolates from the Deinococcus-Thermus phylum include several Meiothermus and Thennus species.Many of these bacteria synthesize thermostable polymer-degrading enzymes that may be useful for biotechnology. The thermoacidophilic archaea Acidianus.Melal/osp/utera.and Suljolobus have also been isolated and studied.A few studies have reported the isolation of thermophilic viruses belonging to Siphoviridae(TTSP4 and TTSPIO) and Fuselloviridae(STSVl) infecting Thennus spp.and Suljolobus spp..respectively.More recently,cultivation-independent studies using 16S rRNA gene sequences, shotgun metagenomics,or "functional gene" sequences have revealed a much broader diversity of microorganisms than represented in culture.Studies of the gene and mRNA encoding the large subunit of the ammonia monooxygenase(imioA) of ammonia-oxidizing Archaea(AOA) and the tetraether lipid erenarchaeol. a potential biomarker for AOA.suggest a wide diversity,but possibly low abundance,of thermophilic AOA in Rehai.Finally,we introduce the Tengchong Partnerships in International Research and Education(PIRE) project,an international collaboration between Chinese and U.S.scientists with the goal of promoting international and interdisciplinary cooperation to gain a more holistic and global view of life in terrestrial geothermal springs. |
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Keywords: | Geomicrobiology Thermophile Yunnan Rehai Tengchong PIRE |
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