

FOLLOWUS
1. Department of Biology John Tabor Laboratory University of Essex
2. School of Biological Sciences University of Wales Swansea
3. Department of Marine Botany Institute of Oceanology Chinese Academy of Sciences
Published:1999
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Liang-feng, D., Merrett, M.J. & Chao-yuan, W. Comparative studies of inorganic carbon utilization inEmiliania huxleyi and some non-calcifying marine microalgae., Chin. J. Ocean. Limnol. 17, 219–232 (1999). https://doi.org/10.1007/BF02842599
Inorganic carbon utilization in the non-calcifying marine microalgae
Nannochloropsis oculata
Phaeodactylum tricornutum andPorphyridium purpureum was compared with high- and low-calcifying strains ofEmiliania huxleyi grown in artificial seawater medium aerated with either air (0.03% V/V CO2) or CO2-free air. For high-calcifying strain ofE. oculata andP. tricornutem
similar growth patterns were observed in air-and CO2-free air-grown cultures.P. purpureum showed a less final cell density in CO2-free air than in air-grown culture. However
low-calcifying strain ofE. huxleyi was able to grow only in air-grown culture
but not in CO2-free air-grown culture. Measurements of alkalinity
pH
concentration of dissolved inorganic carbon (DIC) and free CO2 showed different patterns of DIC utilization. WithN. oculata
P. tricornutum andP. purpureum the pattern of DIC utilization was characterized by an increase of pH and a decrease of DIC but a constant alkalinity in the cultures aerated with air or CO2-free air
suggesting that bicarbonate utilization was concomitant with an efflux of OH−. Both alkalinity and pH were maintained rather constant in air-grown culture of low-calcifying strain ofE. huxleyi
suggesting that diffusive entry of CO2 could meet the requirement of DIC for its photosynthesis and growth. High-calcifying strain ofE. huxleyi
however
showed a pattern of decrease of alkalinity and DIC but an almost constant pH
indicating that bicarbonate was the major form of inorganic carbon utilised by this organism and bicarbonate uptake is unlikely to be accompanied by an efflux of OH−. The final pH values reached byN. oculata
P. tricornutum andP. purpureum in a closed system were 10.75
10.60 and 9.85 respectively
showing that bicarbonate utilisation is concomitant with an efflux of OH−. While the final pH of 8.4 in high-calcifyingE. huxleyi suggests that bicarbonate utilization was not accompanied by an efflux of OH−.
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