FIG 2.

Growth and sucrose accumulation of Anabaena PCC 7120 under salt stress conditions. (A) Growth of the wild-type (WT) and the orrA disruptant DRorrAS with (triangles) or without (circles) 50 mM NaCl was measured as the OD₇₅₀. (B) Cells in the logarithmic phase of the wild-type, DRorrAS, and sigB2 disruptant DRsigB2S strains were subjected to salt stress (50 mM NaCl) at time zero. Sucrose contents were determined at the indicated times. Means ± standard deviations (error bars) of at least three independent experiments are shown. Data that represent a significant difference (P < 0.05; t test) between the wild type and DRorrAS (#) or DRsigB2S (§) are indicated.