Figure 6.

PAM fluorescence monitoring of the induction of state 1 in Cyanothece sp. ATCC 51142 at D2 and D3. The fluorescence levels used in calculations are tagged as described in Methods. R, D, F, A, and 1, resting state in the dark, in the presence of DCMU, measurements with a saturating flash, measurements under actinic light, and state 1, respectively. Samples of 1 mL at 2 μg chlorophyll/mL were treated with 10 μm DCMU and the maximum intensity of the red actinic light of the PAM fluorimeter to induce state 1, as per the protocol in Meunier et al. (1997). The actinic light went off just before the flash.