FIGURE 8.

Circadian rhythm of nhaS3 expression. Synechocystis cells containing a luciferase reporter gene under control of the nhaS3 promoter (PnhaS3::luxAB) were entrained by a 12-h dark period and then shifted to continuous light. The PkaiA::luxAB reporter strain, which shows circadian bioluminescence rhythms,⁴ was used as control. The time scale represents the actual time after transfer to continuous light conditions. The bioluminescence was determined every hour. Each point indicates the average ± standard deviation from seven replicates. The white and black boxes above the graphs represent subjective day and night, respectively.