Abstract
The intensity of the A band of thermoluminescence from isolated spinach chloroplasts was greatly dependent on the excitation temperature between −40 and −10°C. This dependency was analyzed in relation to the S states in the oxygen-evolving system, and the following results were obtained. 1. 1. The A band was charged only slightly by excitation at low temperature (−65°C) with continuous light, but when two flashes had been given before cooling the A band was charged efficiently by the low temperature excitation. 2. 2. The efficiency of the double flash pre-illumination for enhancing the A band showed a steep temperature dependency which agreed with the temperature dependency of the photoconversion from the S 2 to S 3 state. 3. 3. The A-band-enhancing effect was dependent on the number of flashes, and underwent a quadruple oscillation. 4. 4. The enhancing effect decayed in darkness and the decay course agreed with that of the B 1 band but not with that of the B 2 band. From these results, the origin of positive charges for the A band was discussed.
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