Ruminal acetogens and their potential to lower ruminant methane emissions
Ruminal acetogens and their potential to lower ruminant methane emissions
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DOI：
10.1071/ar99004
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发表时间：
1999-01-01
影响因子：
--
通讯作者：
Joblin, KN
中科院分区：
文献类型：
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作者：
Joblin, KN
反刍动物甲烷是澳大利亚和新西兰人为温室气体清单的主要贡献者。直接干预瘤胃提供了一种控制反刍动物甲烷排放的方法。在这方面，通常存在于瘤胃中的产乙酸菌(乙酸菌)是令人感兴趣的，因为它们有可能为H(2)提供替代汇，H(2)是形成甲烷的关键中间体。虽然对放牧反刍动物中的乙酸菌种群知之甚少，但对饲喂含有精料或保藏饲料的反刍动物的研究表明，瘤胃中含有多种乙酸菌，其中一些具有取代甲烷菌的潜在的水基因营养物的作用。本文介绍了瘤胃乙酸菌的研究现状，并概述了乙酸菌在甲烷缓解策略中的潜在应用。与使用乙酸菌在抑制甲烷菌后维持瘤胃低H(2)水平的策略相比，使用乙酸菌来竞争和取代甲烷菌的策略被认为不太可能成功。不过，前者目前还不能完全打折扣。
Ruminant methane is a major contributor to the anthropogenic greenhouse gas inventories of Australia and New Zealand. Direct intervention in the rumen offers one means for controlling ruminant methane emissions. In this respect, acetogenic bacteria (acetogens) normally present in the rumen are of interest because they have the potential to provide an alternative sink for H(2), an essential intermediate in the formation of methane. Although little is known about the populations of acetogens in grazing ruminants, studies on ruminants fed diets containing concentrates or conserved forages indicate that the rumen contains a diversity of acetogens and that some of these have the potential to act as hydrogenotrophs in place of methanogens. This paper describes the current understanding of ruminal acetogens and outlines potential applications of acetogens in methane mitigation strategies. Strategies which use acetogens to outcompete and displace methanogens are considered less likely to be successful than strategies which use acetogens to maintain low H(2) levels in the rumen following suppression of methanogens. However, the former cannot be completely discounted at present.