SAR11 clade dominates ocean surface bacterioplankton communities
SAR11 clade dominates ocean surface bacterioplankton communities
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DOI：
10.1038/nature01240
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发表时间：
2002-12-26
期刊：
影响因子：
64.8
通讯作者：
Giovannoni, SJ
中科院分区：
文献类型：
--
作者：
Morris, RM;Rappé, MS;Giovannoni, SJ
通过基因克隆在海水DNA中发现的最丰富的细菌核糖体RNA基因属于SAR11-一个α-蛋白细菌分支(1)。除了它们在海水中流行的迹象外，人们对这些生物知之甚少。在这里，我们报道了在马尾藻海西北部至3000米水域和俄勒冈州沿海表层水域SAR11分支细胞丰度的定量测量。平均而言，SAR11分支占存在于地表水中的细胞的三分之一，占存在于中海洋带的细胞的近五分之一。在一些区域，SAR11分支的成员占整个表面微生物群落的50%，占亚表层微生物群落的25%。通过外推，我们估计全球海洋中有2.4×10(28)个SAR11单元，其中一半位于真光区。尽管SAR11分支的生物地球化学作用仍不确定，但这些数据支持了这个微生物群是地球上最成功的生物体的结论。
The most abundant class of bacterial ribosomal RNA genes detected in seawater DNA by gene cloning belongs to SAR11-an alpha-proteobacterial clade(1). Other than indications of their prevalence in seawater, little is known about these organisms. Here we report quantitative measurements of the cellular abundance of the SAR11 clade in northwestern Sargasso Sea waters to 3,000 m and in Oregon coastal surface waters. On average, the SAR11 clade accounts for a third of the cells present in surface waters and nearly a fifth of the cells present in the mesopelagic zone. In some regions, members of the SAR11 clade represent as much as 50% of the total surface microbial community and 25% of the subeuphotic microbial community. By extrapolation, we estimate that globally there are 2.4 x 10(28) SAR11 cells in the oceans, half of which are located in the euphotic zone. Although the biogeochemical role of the SAR11 clade remains uncertain, these data support the conclusion that this microbial group is among the most successful organisms on Earth.