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Coordinated regulation of growth, activity and transcription in natural populations of the unicellular nitrogen-fixing cyanobacterium Crocosphaera.

Abstract：

:The temporal dynamics of phytoplankton growth and activity have large impacts on fluxes of matter and energy, yet obtaining in situ metabolic measurements of sufficient resolution for even dominant microorganisms remains a considerable challenge. We performed Lagrangian diel sampling with synoptic measurements of population abundances, dinitrogen (N2) fixation, mortality, productivity, export and transcription in a bloom of Crocosphaera over eight days in the North Pacific Subtropical Gyre (NPSG). Quantitative transcriptomic analyses revealed clear diel oscillations in transcript abundances for 34% of Crocosphaera genes identified, reflecting a systematic progression of gene expression in diverse metabolic pathways. Significant time-lagged correspondence was evident between nifH transcript abundance and maximal N2 fixation, as well as sepF transcript abundance and cell division, demonstrating the utility of transcriptomics to predict the occurrence and timing of physiological and biogeochemical processes in natural populations. Indirect estimates of carbon fixation by Crocosphaera were equivalent to 11% of net community production, suggesting that under bloom conditions this diazotroph has a considerable impact on the wider carbon cycle. Our cross-scale synthesis of molecular, population and community-wide data underscores the tightly coordinated in situ metabolism of the keystone N2-fixing cyanobacterium Crocosphaera, as well as the broader ecosystem-wide implications of its activities.

journal_name

Nat Microbiol

journal_title

Nature microbiology

authors

Wilson ST,Aylward FO,Ribalet F,Barone B,Casey JR,Connell PE,Eppley JM,Ferrón S,Fitzsimmons JN,Hayes CT,Romano AE,Turk-Kubo KA,Vislova A,Armbrust EV,Caron DA,Church MJ,Zehr JP,Karl DM,DeLong EF

doi

10.1038/nmicrobiol.2017.118

subject

Has Abstract

pub_date

2017-07-31 00:00:00

pages

17118

issn

2058-5276

pii

nmicrobiol2017118

journal_volume

2

pub_type

杂志文章

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