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Silicon content of individual cells of Synechococcus from the North Atlantic Ocean

机译：北大西洋冰球菌单个细胞的硅含量

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The widely distributed marine cyanobacterium Synechococcus is thought to exert an influence on the marine silicon (Si) cycle through its high cellular Si relative to organic content. There are few measurements of Si in natural populations of Synechococcus, however, and the degree to which Synechococcus from various oligotrophic field sites and depths accumulate the element is unknown. We used synchrotron x-ray fluorescence to measure Si quotas in individual Synechococcus cells collected during three cruises in the western North Atlantic Ocean in the summer and fall, focusing on cells from the surface mixed layer (SML; <10 m) and the deep chlorophyll maximum (DCM). Individual cell quotas varied widely, from 1 to 4700 amol Si cell(-1), though the middle 50% of quotas ranged between 17 and 119 amol Si cell-1. Mean station-specific quotas exhibited an even narrower range of 31-72 amol Si cell-1. No significant differences in Si quotas were observed across cruises or among stations, and no effect of ambient silicic acid concentration on quotas was observed within the narrow range of silicic acid concentrations encountered (0.6-1.3 mu M). Despite this small range in ambient silicic acid, cells collected from the SML had an average of two-fold more Si than cells collected from the DCM. Differences in Si content with depth may be related to observed differences in the dominant Synechococcus clades between the SML and DCM habitats, determined by petB gene sequencing. (C) 2016 Elsevier B.V. All rights reserved.
机译：人们认为，分布广泛的海洋蓝细菌Syechococcus通过其相对于有机物含量较高的细胞硅来影响海洋硅（Si）循环。但是，在自然球菌的自然种群中几乎没有Si的测量值，而且各种贫营养场位点和深度的球菌对元素的积累程度还不得而知。我们使用同步加速器X射线荧光来测量夏季和秋季在北大西洋西部的三个航行中收集的单个Synechococcus细胞中的Si配额，重点是来自表面混合层（SML; <10 m）和深层叶绿素的细胞最大值（DCM）。单个电池配额的变化范围很大，从1至4700 amol Si cell（-1），尽管中间的50％配额介于17至119 amol Si cell-1之间。平均站特定配额显示出更窄的31-72 amol Si cell-1范围。在整个航行中或在各站之间，未观察到硅配额的显着差异，并且在遇到的硅酸浓度窄范围内（0.6-1.3μM），未观察到环境硅酸浓度对配额的影响。尽管周围硅酸的范围很小，但从SML收集的细胞的Si平均比从DCM收集的细胞多两倍。 Si含量随深度的差异可能与观察到的由petB基因测序确定的SML和DCM生境之间的优势Synechococcus进化枝差异有关。 （C）2016 Elsevier B.V.保留所有权利。

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