Figure 1.

Growth of wild-type (a, c, e) and ΔHik34 mutant (b, d, f) strains of Synechocystis estimated by changes in optical density at 720 nm and by difference of optical densities Δ680 = OD₆₈₀ − OD₇₂₀ (a, b); steady state fluorescence excited by red (Ft_red) or blue (Ft_blue) lights (c, d); steady state Ft_red response during first hour of transition from 32 °C to 44 °C (e, f). Dashed lines mark time of heat shock treatment. Time zero marks the temperature shift from 32 °C to 44 °C. Cultures were growing 28 h at 32 °C before the heat shock. The graphs represent typical values from 6 and 4 independent experiments for WT and ΔHik34 mutant, respectively.