Abstract
The decay of flash-induced delayed luminescence was compared in the seconds to minutes time region in triazine-susceptible and -resistant chloroplasts. The slow luminescence component assigned to S 2Q − B and S 3Q − B recombination decayed more rapidly in resistant as compared to susceptible chloroplasts ( t 1 2 ~ 8.5 and 44 s, respectively) indicating that the midpoint potential of q b is lowered in the resistant chloroplasts. The luminescence intensity depended on the number of exciting flashes. The oscillation pattern was opposite in the two biotypes and could be computer simulated with the assumption that the Q B/Q B − ratio was about 1 in sensitive and 1.5 in resistant chloroplasts. Thus atrazine resistance also induces a change in the oxidation-reduction state of the Q B pool.
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