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Probing rapid carbon fixation in fast-growing seaweed Ulva meridionalis using stable isotope 13C-labelling.

Abstract：

:The high growth rate of Ulva seaweeds makes it a potential algal biomass resource. In particular, Ulva meridionalis grows up to fourfold a day. Here, we demonstrated strong carbon fixation by U. meridionalis using 13C stable isotope labelling and traced the 13C flux through sugar metabolites with isotope-ratio mass spectrometry (IR-MS), Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), 13C-nuclear magnetic resonance spectrometry (13C-NMR), and gas chromatography-mass spectrometry (GC-MS). U. meridionalis was first cultured in 13C-labelled enriched artificial seawater for 0-12 h, and the algae were collected every 4 h. U. meridionalis grew 1.8-fold (dry weight), and the 13C ratio reached 40% in 12 h, whereas 13C incorporation hardly occurred under darkness. At the beginning of the light period, 13C was incorporated into nucleic diphosphate (NDP) sugars in 4 h, and 13C labelled peaks were identified using FT-ICR-MS spectra. Using semiquantitative 13C-NMR measurements and GC-MS, 13C was detected in starch and matrix polysaccharides after the formation of NDP sugars. Moreover, the 14:10 light:dark regime resulted into 85% of 13C labelling was achieved after 72 h of cultivation. The rapid 13C uptake by U. meridionalis shows its strong carbon fixation capacity as a promising seaweed biomass feedstock.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tsubaki S,Nishimura H,Imai T,Onda A,Hiraoka M

doi

10.1038/s41598-020-77237-1

subject

Has Abstract

pub_date

2020-11-23 00:00:00

pages

20399

issue

1

issn

2045-2322

pii

10.1038/s41598-020-77237-1

journal_volume

10

pub_type

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