FIG. 2.

Relative luminescence of suspensions of mutant AB5 as a function of the concentration of NaCl, after 2 h of exposure, as measured with an ATP photometer (A) and of AB5DR386a as a function of the time of exposure to 0.1 M NaCl or 0.2 M sucrose, trehalose, or proline (B). Readings in panel B are mean values of captured photons minute⁻¹ spot⁻¹ (3 ng of chlorophyll a per spot; average standard error of the mean/mean, 0.085).