根據(jù)David Walsh及其同僚的一項(xiàng)新的分析披露，海洋的死亡區(qū)域中存在著一種具有專(zhuān)門(mén)化代謝工具箱的微生物,，使得它們能夠在缺氧的水域中旺盛生長(zhǎng),。海洋的諸如北美墨西哥灣離岸水域等死亡區(qū)正隨著全球暖化和因農(nóng)耕和污水所導(dǎo)致的氮溢流的增加而在擴(kuò)大。海洋死亡區(qū)的擴(kuò)大對(duì)漁業(yè)和海洋碳匯的形成具有重要的影響,。然而人們對(duì)促成其化學(xué)反應(yīng)的該區(qū)域中的微生物卻基本上不了解,。
研究人員對(duì)British Columbia死亡區(qū)的基因?qū)W取樣發(fā)現(xiàn)了一種大量存在的微生物,，它與深海蛤蜊和貽貝腮中的從化學(xué)反應(yīng)獲取其能量的細(xì)菌相似。該死亡區(qū)中的微生物的多種特殊性中還包括其攜帶著有助于碳截留及硫脫毒的基因,。（生物谷Bioon.com）
生物谷推薦原始出處：
Science 23 October 2009:DOI: 10.1126/science.1175309
Metagenome of a Versatile Chemolithoautotroph from Expanding Oceanic Dead Zones
David A. Walsh,1 Elena Zaikova,1 Charles G. Howes,1 Young C. Song,1 Jody J. Wright,1 Susannah G. Tringe,2 Philippe D. Tortell,3,4 Steven J. Hallam1,5,*
Oxygen minimum zones, also known as oceanic "dead zones," are widespread oceanographic features currently expanding because of global warming. Although inhospitable to metazoan life, they support a cryptic microbiota whose metabolic activities affect nutrient and trace gas cycling within the global ocean. Here, we report metagenomic analyses of a ubiquitous and abundant but uncultivated oxygen minimum zone microbe (SUP05) related to chemoautotrophic gill symbionts of deep-sea clams and mussels. The SUP05 metagenome harbors a versatile repertoire of genes mediating autotrophic carbon assimilation, sulfur oxidation, and nitrate respiration responsive to a wide range of water-column redox states. Our analysis provides a genomic foundation for understanding the ecological and biogeochemical role of pelagic SUP05 in oxygen-deficient oceanic waters and its potential sensitivity to environmental changes.
1 Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
2 Department of Energy Joint Genome Institute, Walnut Creek, CA 94598, USA.
3 Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
4 Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
5 University of British Columbia Graduate Program in Bioinformatics, Vancouver, BC V6T 1Z4, Canada.
