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Effect of combined glgC and sps overexpression in strains of Syn7942. Sucrose production (a and c) and glycogen content (b and d) of strains QL241, QL233, and FL130 after salt stress are displayed. Cyanobacterial cells were precultivated in medium containing 1 mM IPTG to induce sps expression and then exposed to 150 mM NaCl to induce sucrose production. Asterisks indicate significant differences from QL233 (a), FL130 (c and d), or day 0 (b) (Student's t test, P < 0.05).
