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Growth of PCC7942-WT and PCC7942-XC1 facing high pH stress under theophylline concentrations of (A) 0 μM, (B) 110 μM. To adjust pH values of the culture medium to 11.0, NaOH would be added in day 2 as the arrow pointed. The OD730 data utilized are averages of measurements from at least three independent biological repeats, and standard deviation bars are also shown. Asterisks’ indicate significant differences between the data of WT and XC1 (Student’s t-test, P < 0.05).
