NDLI: Quantitative Analysis of Carbon Flow into Photosynthetic Products Functioning as Carbon Storage in the Marine Coccolithophore, Emiliania huxleyi

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Quantitative Analysis of Carbon Flow into Photosynthetic Products Functioning as Carbon Storage in the Marine Coccolithophore, Emiliania huxleyi

Content Provider	Springer Nature Link
Author	Tsuji, Yoshiri Yamazaki, Masatoshi Suzuki, Iwane Shiraiwa, Yoshihiro
Copyright Year	2015
Abstract	The bloom-forming coccolithophore Emiliania huxleyi (Haptophyta) is a dominant marine phytoplankton, cells of which are covered with calcareous plates (coccoliths). E. huxleyi produces unique lipids of C37–C40 long-chain ketones (alkenones) with two to four trans-unsaturated bonds, β-glucan (but not α-glucan) and acid polysaccharide (AP) associated with the morphogenesis of CaCO3 crystals in coccoliths. Despite such unique features, there is no detailed information on the patterns of carbon allocation into these compounds. Therefore, we performed quantitative estimation of carbon flow into various macromolecular products by conducting 14C-radiotracer experiments using NaH14CO3 as a substrate. Photosynthetic 14C incorporation into low molecular-mass compounds (LMC), extracellular AP, alkenones, and total lipids except alkenones was estimated to be 35, 13, 17, and 25 % of total 14C fixation in logarithmic growth phase cells and 33, 19, 18, and 18 % in stationary growth phase cells, respectively. However, less than 1 % of 14C was incorporated into β-glucan in both cells. 14C-mannitol occupied ca. 5 % of total fixed 14C as the most dominant LMC product. Levels of all 14C compounds decreased in the dark. Therefore, alkenones and LMC (including mannitol), but not β-glucan, function in carbon/energy storage in E. huxleyi, irrespective of the growth phase. Compared with other algae, the low carbon flux into β-glucan is a unique feature of carbon metabolism in E. huxelyi.
Starting Page	428
Ending Page	440
Page Count	13
File Format	PDF
ISSN	14362228
Journal	Marine Biotechnology
Volume Number	17
Issue Number	4
e-ISSN	14362236
Language	English
Publisher	Springer US
Publisher Date	2015-04-15
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alkenones Carbon partitioning Carbon storage compound Emiliania huxleyi Haptophyte Lipid biosynthesis Freshwater & Marine Ecology Microbiology Zoology Engineering
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Biotechnology

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Quantitative Analysis of Carbon Flow into Photosynthetic Products Functioning as Carbon Storage in the Marine Coccolithophore, Emiliania huxleyi

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Quantitative Analysis of Carbon Flow into Photosynthetic Products Functioning as Carbon Storage in the Marine Coccolithophore, Emiliania huxleyi

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