Salinity-induced oxidative stress-mediated change in fatty acids composition of cyanobacterium Synechococcus sp. PCC7942
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The present study was undertaken to examine the salinity stress-induced physiological and biochemical alterations in the cyanobacterium Synechococcus sp. PCC 7942. Cyanobacterial cultures supplemented with different concentrations of NaCl were evaluated for growth, carbohydrate, total lipid, ROS generation, and stress biomarkers to evaluate the ROS-mediated lipid production in Synechococcus 7942. Salt concentration of 500 mM induced a five- and threefold increase in the production of carbohydrates and lipids, respectively. The fatty acids composition in terms of total quantity and oleic acid content of the investigated species was also improved as the salinity level increased from 0 to 500 mM NaCl. The data showed maximum MUFA production at 10 mM NaCl with dominance of palmitoleic acid (88.3%) and oleic acid (0.31%), whereas PUFA was found to be maximally produced at 250 mM NaCl with dominance of linoleic acid. Salt stress enhanced the accumulation of carbohydrate and total lipids and antioxidative enzymes, and modulates the fatty acids and hydrocarbon composition of cyanobacterium. Production of fatty acid and hydrocarbon under saline conditions indicates that salinity can be used as a factor to modulate the biochemical pathways of cyanobacteria toward efficient biofuel production.
KeywordsBiofuel FAMEs Lipids Hydrocarbons Salinity Synechococcus sp. PCC 7942
Fatty acid methyl esters
Gas chromatography/mass spectrometry
Monounsaturated fatty acid
Polyunsaturated fatty acid
Reactive oxygen species
Saturated fatty acid
We are thankful to the Head, Department of Botany, Banaras Hindu University, Varanasi, India, for providing laboratory facilities. We thank Prof. Karl Forchhammer, Department of Organismic Interactions (Microbiology), Interfaculty Institute of Microbiology and Infection, Auf der Morgenstelle, 2872076, University of Tübingen, Germany, for providing Synechococcus sp. PCC 7942 strain. Two of us (Ekta Verma and Niveshika) are thankful to the UGC, New Delhi, for financial support in the form of JRF.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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