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The pH dependence of two, flash-induced slowly decaying delayed luminescence components - resulting from charge recombination of QA- and QB- with the S2 and S3 states (S2QA- + S3QA- and S2QB- + S3QB- recombinations) - in untreated and herbicide treated chloroplasts was investigated within a pH range of 5.5 to 8.5. The component associated with QA- showed the same pH-dependence in untreated and in DCMU-treated chloroplasts: its half-decay time increased with increasing pH reflecting an appr. +5doi:10.1515/znc-1987-9-1021 fatcat:sapomgbby5d6xbu5d5lv6hodyu