Dominant oceanic bacteria secure phosphate using a large extracellular buffer.

Abstract:

:The ubiquitous SAR11 and Prochlorococcus bacteria manage to maintain a sufficient supply of phosphate in phosphate-poor surface waters of the North Atlantic subtropical gyre. Furthermore, it seems that their phosphate uptake may counter-intuitively be lower in more productive tropical waters, as if their cellular demand for phosphate decreases there. By flow sorting (33)P-phosphate-pulsed (32)P-phosphate-chased cells, we demonstrate that both Prochlorococcus and SAR11 cells exploit an extracellular buffer of labile phosphate up to 5-40 times larger than the amount of phosphate required to replicate their chromosomes. Mathematical modelling is shown to support this conclusion. The fuller the buffer the slower the cellular uptake of phosphate, to the point that in phosphate-replete tropical waters, cells can saturate their buffer and their phosphate uptake becomes marginal. Hence, buffer stocking is a generic, growth-securing adaptation for SAR11 and Prochlorococcus bacteria, which lack internal reserves to reduce their dependency on bioavailable ambient phosphate.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zubkov MV,Martin AP,Hartmann M,Grob C,Scanlan DJ

doi

10.1038/ncomms8878

subject

Has Abstract

pub_date

2015-07-22 00:00:00

pages

7878

issn

2041-1723

pii

ncomms8878

journal_volume

6

pub_type

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