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Microbial diversity in coastal sediments during pre- and post-tsunami periods in the south east coast of India

Frontiers in Biology 2014年第2期9卷 161-167页

作者： Prince S. GODSON N. CHANDRASEKAR S. Krishna KUMAR Vimi P.V GeoMicrobiology Laboratory Centre for GeoTechnology Manonmaniam Sundaranar University Tirunelveli 627 012 Tamil Nadu India Department of Microbiology V.T.M. College of Arts and Science Arumanai Kanyakumari-629 151 Tamil Nadu India

Sediment samples were collected from 12 beaches affected by the 2004 Asian Tsunami in the south-east coast of India between Vanagiri and Nagoor. The objective of the present study is to delineate the microbial diversity in pre- and post-tsunami disaster coastal sediments. The collected marine sediments indicate that the overall microbial diversity is higher in the pre-tsunami sediments. The increase in pathogenic bacteria and fungal species after the tsunami is obscured due to inundation and backwashing of seawater along the coast. The reduction of other microbial diversity after the tsunami is attributed that the coastal and shelf sediments play an important role in the demineralization of organic matter, which supports the growth of microbes. The continuous exchange of ocean water and backwashing of coastal sediments by the tsunami wave probably reduced the pathogenic bacterial diversity in the sediments.

关键词： bacterial diversity tsunami coastal sediments fungal diversity principal component analysis person correlationmatrix

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Widespread Bathyarchaeia encode a novel methyltransferase utilizing lignin-derived aromatics

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mLife 2023年第3期2卷 272-282页

作者： Tiantian Yu Haining Hu Xianhong Zeng Yinzhao Wang Donald Pan Longhui Deng Lewen Liang Jialin Hou Fengping Wang School of Oceanography Shanghai Jiao Tong UniversityShanghaiChina State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghaiChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina

Lignin degradation is a major process in the global carbon cycle across both terrestrial and marine ***,which are among the most abundant microorganisms in marine sediment,have been proposed to mediate anaerobic lignin ***,the mechanism of bathyarchaeial lignin degradation remains ***,we report an enrichment culture of Bathy-archaeia,named Candidatus Baizosediminiarchaeum ligniniphilus DL1YTT001(***),from coastal sediments that can grow with lignin as the sole organic carbon source under mesophilic anoxic *** possesses and highly expresses novel methyltransferase 1(MT1,mtgB)for transferring methoxyl groups from lignin monomers to cob(I)*** have no homology with known microbial methyltransferases and are present only in bathyarchaeial *** expression of the mtgB gene confirmed O-demethylation *** mtgB genes were identified in metagenomic data sets from a wide range of coastal sediments,and they were highly expressed in coastal sediments from the East China *** findings suggest that Bathyarchaeia,capable of O-demethylation via their novel and specific methyltransferases,are ubiquitous in coastal sediments.

关键词： Bathyarchaeia coastal sediments lignin-degrading lignin-derived aromatics specific methyltransferase

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