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Effect of extracellular polymeric substances on
Dolichospermum aggregation during temperature rise- Journal of Oceanology and Limnology Vol. 41, Issue 6, Pages: 2208-2218(2023)
- Affiliations：
1.School of Environment, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
2.Green Economy Development Institute, Nanjing University of Finance and Economics, Nanjing 210023, China
3.Jiangsu Engineering Lab of Water and Soil Eco-remediation, Nanjing 210023, China
- Author bio：
liujine@njnu.edu.cn
lmzhang@njnu.edu.cn
- Funds：
DOI：
CLC：Received：15 June 2022，
Accepted：17 August 2022，
Online First：25 November 2022，
Published：01 November 2023
- Accepted：
Scan QR Code
DENG Dailan,MENG Han,MA You,et al.Effect of extracellular polymeric substances on Dolichospermum aggregation during temperature rise[J].Journal of Oceanology and Limnology,2023,41(06):2208-2218.
摘要
Abstract
Dolichospermum
a typical model filamentous of cyanobacteria
has the potentia
l to cause severely bloom. Extracellular polymeric substances (EPSs) are considered to influence the aggregation of the algae
and temperature is a significant factor affecting EPSs secretion. However
the mechanism of how EPSs affects the aggregation of
Dolichospermum
is still unclear because the structure and composition of EPSs are complex. In this study
the effects of EPSs on the aggregation of
Dolichospermum
during the rise of temperature (7–37 °C) were determined. The results showed that the concentration of extracellular polysaccharides and proteins changed significantly with increasing temperature (
P
<
0.01). Firstly
during the increasing temperature
the polysaccharide content of EPSs increased from 20.34 to 54.64 mg/L
and the polysaccharides in the soluble EPS (S-EPS) layer changed significantly. The protein content reached maximum value at 21 °C (14.52 mg/L) and varied significantly in S-EPS and loosely bound EPS (LB-EPS). In the EPSs matrix
humus substances and protein were main components of S-EPS and LB-EPS
and protein was the main component of tightly bound EPS (TB-EPS). Secondly
the cell density of
Dolichospermum
increased during the temperature rise while the aggregation ratio decreased. Moreover
zeta potential and surface thermodynamic analysis of
Dolichospermum
revealed that the interfacial free energy and electrostatic repulsion increased gradually with increasing temperature
which further reduced the aggregation of
Dolichospermum
. Finally
principal component analysis (PCA) analysis showed the aggregation of
Dolichospermum
was directly related to the changes of protein in EPSs (especially S-EPS and LB-EPS) and zeta potential
and polysaccharides in EPSs inhibited the aggregation of
Dolichospermum
. Based on these results
it was illustrated that the composition and concentration of EPSs affected the cell surface properties of
Dolichospermum
with the change of temperature and thus affected the aggregation of
Dolichospermum
.
关键词
Keywords
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