Sulfate reducing bacteria in microbial mats: Changing paradigms, new discoveries
Sulfate reducing bacteria in microbial mats: Changing paradigms, new discoveries
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DOI：
10.1016/j.sedgeo.2005.12.008
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发表时间：
2006-03-15
影响因子：
2.8
通讯作者：
Visscher, PT
中科院分区：
文献类型：
--
作者：
Baumgartner, LK;Reid, RP;Visscher, PT
硫酸盐还原菌（SRB）存在于地球的大部分历史中，并且仍然是现代系统中碳循环的主要贡献者。尽管其重要性，对SRB的误解是普遍的。特别是，SRB通常被认为缺乏耐氧性，并且仅存在于缺氧环境中。在过去的二十年里，研究人员发现SRB实际上可以耐受甚至呼吸氧气。微生物垫系统的研究表明，硫酸盐还原菌在垫的好氧区既丰富又活跃。此外，硫酸盐还原菌已被发现是高度活跃的微生物垫的石化区，这表明硫酸盐还原和垫石化之间的连接。在本文中，我们回顾了最近的研究SRB的分布和目前的新的初步研究结果都死的多样性和分布的delta-proteobacteria SRB在石化和非石化微生物垫系统。这些初步的研究结果表明，未开发的微生物垫系统中的SRB的多样性，并展示了密切的微空间关联的SRB和蓝藻在好氧区的垫。可能的机制和进一步的研究，以阐明通过硫酸盐还原碳酸盐沉淀的机制进行了讨论。(c)2006 Elsevier B. V.保留所有权利。
Sulfate reducing bacteria (SRB) have existed throughout much of Earth's history and remain major contributors to carbon cycling in modem systems. Despite their importance, misconceptions about SRB are prevalent. In particular, SRB are commonly thought to lack oxygen tolerance and to exist only in anoxic environments. Through the last two decades, researchers have discovered that SRB can, in fact, tolerate and even respire oxygen. Investigations of microbial mat systems have demonstrated that SRB are both abundant and active in the oxic zones of mats. Additionally, SRB have been found to be highly active in the lithified zones of microbial mats, suggesting a connection between sulfate reduction and mat lithification. In the present paper, we review recent research on SRB distribution and present new preliminary findings on both die diversity and distribution of delta-proteobacterial SRB in lithifying and non-lithifying microbial mat systems. These preliminary findings indicate the unexplored diversity of SRB in a microbial mat system and demonstrate the close microspatial association of SRB and cyanobacteria in the oxic zone of the mat. Possible mechanisms and further studies to elucidate mechanisms for carbonate precipitation via sulfate reduction are also discussed. (c) 2006 Elsevier B.V. All rights reserved.