Abstract
Abscisic acid (ABA) had no significant immediate effect on the activities of Photosystems PS 1 (DPIP/Ascorbate → MV) and PS 2 (H2O → K3[Fe(CN)6]), when added during the activity measurements in a final concentration of 10¯4 M to both freshly prepared chloroplasts from primary leaves ofPhaseolus vulgaris L. and chloroplast preparations preincubated with ABA for 22 h. This incubation also did not induce any significant post-effect on PS activities.
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