Picocyanobacteria and deep-ocean fluorescent dissolved organic matter share similar optical properties

Nature Communications
Zhao ZhaoFeng Chen

Abstract

Marine chromophoric dissolved organic matter (CDOM) and its related fluorescent components (FDOM), which are widely distributed but highly photobleached in the surface ocean, are critical in regulating light attenuation in the ocean. However, the origins of marine FDOM are still under investigation. Here we show that cultured picocyanobacteria, Synechococcus and Prochlorococcus, release FDOM that closely match the typical fluorescent signals found in oceanic environments. Picocyanobacterial FDOM also shows comparable apparent fluorescent quantum yields and undergoes similar photo-degradation behaviour when compared with deep-ocean FDOM, further strengthening the similarity between them. Ultrahigh-resolution mass spectrometry (MS) and nuclear magnetic resonance spectroscopy reveal abundant nitrogen-containing compounds in Synechococcus DOM, which may originate from degradation products of the fluorescent phycobilin pigments. Given the importance of picocyanobacteria in the global carbon cycle, our results indicate that picocyanobacteria are likely to be important sources of marine autochthonous FDOM, which may accumulate in the deep ocean.

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Citations

Dec 27, 2018·Environmental Microbiology·Xiaoting FangQinglu Zeng
Dec 27, 2019·Geophysical Research Letters·Emanuele Organelli, Hervé Claustre
Jul 14, 2020·Frontiers in Microbiology·Hongyue Dang
Jul 18, 2020·Environmental Monitoring and Assessment·Albertina DiasSuresh Thayapurath
Nov 13, 2020·Frontiers in Microbiology·Shuji GotoYouhei Yamashita
Mar 25, 2021·International Journal of Environmental Science and Technology : IJEST·P R MuduliA Sudhakar
Jul 15, 2021·Environmental Science & Technology·Boris P YakimovEvgeny A Shirshin
Dec 13, 2017·Nature Communications·Saeed Roshan, Timothy DeVries

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Methods Mentioned

BETA
nuclear magnetic resonance
nuclear
NMR

Software Mentioned

Openfluor
drEEM toolbox
Parallel Factor Analysis ( PARAFAC )
MATLAB

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