The use of high alkaline medium is a feasible way to provide carbon source and prevent biological contamination for the outdoor cultivation of alkaliphilic microalgae and cyanobacteria. A novel cyanobacterial strain was isolated from the open pond of a marine green alga (Picochlorum sp. SCSIO-45015, Sanya, Hainan) and identified as Cyanobacterium sp. SCSIO-45682. The effects of initial sodium bicarbonate (NaHCO3) concentrations on the growth and biochemical composition of Cyanobacterium sp. SCSIO-45682 were investigated. The results demonstrated that Cyanobacterium sp. SCSIO-45682 had good adaptation to 16.8 g/L NaHCO3 (the same concentration of NaHCO3 used in Zarrouk medium for Spirulina). Moreover, the yields of biomass, polysaccharide, chlorophyll a (chl a), and phycocyanin increased under high NaHCO3 concentrations. The maximum final biomass concentration of 2.5 g/L was observed at 8.4 g/L NaHCO3, while the highest intracellular total saccharide content of 49.2% of dry weight (DW) and exopolysaccharide (EPS) concentration of 93 mg/L were achieved at the NaHCO3 concentration of 16.8 g/L. The crude protein content declined under high NaHCO3 concentrations, which provide a possible explanation for the accumulation of polysaccharide. This study shows a good potential of alkaliphilic Cyanobacterium sp. SCSIO-45682 as a polysaccharide feedstock.
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Supported by Key-Area Research and Development Program of Guangdong Province (No. 2020B1111030004), the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0406), the 13th Five-Year Plan Marine Economy Innovation Development Demonstration Project (No. BHSFS004), the Project of State Key Laboratory of Marine Resource Utilization in South China Sea (No. 2018004), the Guizhou Education Department Young scientific talents Promoting Program (No. KY 160), and the Project of Danzi (WetCode) Group (No. DZ201501)
Data Availability Statement
The data that support the fi ndings of the current study are available from the corresponding author on reasonable request.
Conflict of Interest
The authors declare that they have no conflict of interest.
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Chen, Z., Li, T., Yang, B. et al. Isolation of a novel strain of Cyanobacterium sp. with good adaptation to extreme alkalinity and high polysaccharide yield. J. Ocean. Limnol. (2021). https://doi.org/10.1007/s00343-020-0113-7
- alkaliphilic cyanobacterium
- biochemical composition
- Cyanobacterium sp. SCSIO-45682
- high sodium bicarbonate (NaHCO3) concentrations