二甲基磺酰丙酸盐
二甲基硫醚
γ蛋白杆菌
基因组
硫循环
生物
极地的
自行车
生物地球化学循环
海洋学
生态学
浮游植物
硫黄
化学
细菌
地质学
古生物学
遗传学
基因
物理
营养物
考古
有机化学
历史
16S核糖体RNA
天文
作者
Zhao-Jie Teng,Qi‐Long Qin,Weipeng Zhang,Jian Li,Huihui Fu,Peng Wang,Musheng Lan,Guangfu Lu,Jianfeng He,Andrew McMinn,Min Wang,Xiu-Lan Chen,Yuzhong Zhang,Yin Chen,Chunyang Li
出处
期刊:Microbiome
[Springer Nature]
日期:2021-10-16
卷期号:9 (1)
被引量:18
标识
DOI:10.1186/s40168-021-01153-3
摘要
Dimethyl sulfide (DMS) is the dominant volatile organic sulfur in global oceans. The predominant source of oceanic DMS is the cleavage of dimethylsulfoniopropionate (DMSP), which can be produced by marine bacteria and phytoplankton. Polar oceans, which represent about one fifth of Earth's surface, contribute significantly to the global oceanic DMS sea-air flux. However, a global overview of DMS and DMSP cycling in polar oceans is still lacking and the key genes and the microbial assemblages involved in DMSP/DMS transformation remain to be fully unveiled.Here, we systematically investigated the biogeographic traits of 16 key microbial enzymes involved in DMS/DMSP cycling in 60 metagenomic samples from polar waters, together with 174 metagenome and 151 metatranscriptomes from non-polar Tara Ocean dataset. Our analyses suggest that intense DMS/DMSP cycling occurs in the polar oceans. DMSP demethylase (DmdA), DMSP lyases (DddD, DddP, and DddK), and trimethylamine monooxygenase (Tmm, which oxidizes DMS to dimethylsulfoxide) were the most prevalent bacterial genes involved in global DMS/DMSP cycling. Alphaproteobacteria (Pelagibacterales) and Gammaproteobacteria appear to play prominent roles in DMS/DMSP cycling in polar oceans. The phenomenon that multiple DMS/DMSP cycling genes co-occurred in the same bacterial genome was also observed in metagenome assembled genomes (MAGs) from polar oceans. The microbial assemblages from the polar oceans were significantly correlated with water depth rather than geographic distance, suggesting the differences of habitats between surface and deep waters rather than dispersal limitation are the key factors shaping microbial assemblages involved in DMS/DMSP cycling in polar oceans.Overall, this study provides a global overview of the biogeographic traits of known bacterial genes involved in DMS/DMSP cycling from the Arctic and Antarctic oceans, laying a solid foundation for further studies of DMS/DMSP cycling in polar ocean microbiome at the enzymatic, metabolic, and processual levels. Video Abstract.
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