

FOLLOWUS
1.College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo315832, China
2.School of Biological and Chemical Engineering, Panzhihua University, Panzhihua617000, China
3.Ningbo Institute of Oceanography, Ningbo315832, China
4.School of Marine Life, Ningbo University, Ningbo315832, China
5.Earth & Life Institute, Catholic University of Louvain, Louvain-La-Neuve 1348, Belgium
hanjichang@nbu.edu.cn
Received:05 December 2023,
Online First:04 January 2024,
Published:01 September 2024
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ZHU Zhengfeng,HE Zhichao,LI Jian,et al.An axenic strain reveals the responses of Phaeodactylum tricornutum to external organic carbon[J].Journal of Oceanology and Limnology,2024,42(05):1621-1633.
ZHU Zhengfeng,HE Zhichao,LI Jian,et al.An axenic strain reveals the responses of Phaeodactylum tricornutum to external organic carbon[J].Journal of Oceanology and Limnology,2024,42(05):1621-1633. DOI: 10.1007/s00343-024-3251-5.
The model diatom
Phaeodactylum
tricornutum
is considered a promising source of various high value bioproducts
and developing cultivation processes is crucial for its commercialization. Although mixotrophy and heterotrophy have been recommended as effective strategies for microalgal cultivation
previous studies on
P
.
tricornutum
have yielded conflicting results in terms of cultivating this microalga. To verify the capacity of this microalga utilizing extern
al organic carbon
both heterotrophic and mixotrophic cultivation with varied carbon sources were performed using an axenic strain. The results demonstrate that glycerol was the only organic carbon that substantially stimulated the growth of
P
.
tricornutum
in the presence of light. Sodium acetate (NaAc) at low concentrations could also promote growth
while at high concentrations led to severe inhibition under mixotrophic conditions. The addition of glucose imposed no appreciable impact on either cell density or biomass concentration
confirming that
P
.
tricornutum
cannot metabolize external glucose. Subsequently
a comparative analysis between mixotrophy and autotrophy was performed to reveal the influences of glycerol on the cellular metabolism based on growth performances
biochemical compositions
and chlorophyll fluorescence parameters. Results also indicate that the addition of glycerol did not have detrimental effects on the capacity of either pigments biosynthesis or photosynthesis
but enhanced the saturated fatty acids and reduced the unsaturated fatty acids.
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