FIG. 3.

Effect of succinate addition on chlorophyll fluorescence yield as a function of time after the addition of KCN (at time zero) in the NDH-1-deficient strain. Variable fluorescence (arbitrary units [A.U.]) was monitored in samples without (closed symbols) and with (open symbols) addition of 1 mM succinate or with both 1 mM succinate and 5 mM malonate (∗) 5 min prior to KCN addition. The NDH-1-deficient culture was incubated with or without succinate for 2 (□, ■) or 10 (◊, ⧫) min while bubbling with 3% CO₂.