Synechococcus sp. strain PCC 7002 Can Produce Glycogen for Biofuels in an Oceanic Environment

Glycogen-producing cyanobacteria is a promising feedstock for ethanol production. Utilization of marine cyanobacteria as a glycogen producer can also eliminate the need for a freshwater supply. Synechococcus sp. strain PCC 7002 is a fast-growing marine coastal cyanobacteria, however, its glycogen yield has not yet been determined. 

The optimal culture conditions for glycogen production in Synechococcus sp. strain PCC 7002 were investigated. The maximum glycogen production of 3.5 g/L for 7 days was obtained under a high light intensity, a high CO2 level, and a nitrogen-depleted condition in brackish water. The glycogen production performance in Synechococcus sp. strain PCC 7002 was the best ever reported glycogen or starch production in cyanobacteria and microalgae. Glycogen production of Synechococcus sp. strain PCC 7002 was also evaluated in seawater and freshwater. The peak of glycogen production of Synechococcus sp. strain PCC 7002 in seawater and freshwater were 3.0 and 1.8 g/L in 7 days, respectively.

Synechococcus sp. strain PCC 7002 was proven to have a high glycogen production activity and glycogen can also be provided from coastal waters. This work supports Synechococcus sp. strain PCC 7002 as a promising source for biofuel production.