Abscisic acid (ABA) at low concentrations brings about the formation of turions (dormant fronds) in Lemna polyrhiza within 3 to 5 days after application. The incorporation of 3H-thymidine into DNA, separated by polyacrylamide-gel electrophoresis, is inhibited by 80 to 90 per cent within 1 to 3 h of ABA application. The incorporation of 14C-orotate and 32P into RNA is not inhibited until 3 to 9 h after ABA application, but 70 per cent inhibition is reached after 24 h on 10−5 M ABA. There is little inhibition of 14C-leucine incorporation into protein until 2 to 3 days after application of ABA. The capacity of nitrate to induce nitrate reductase in cultures previously grown on nitrate-free medium is not affected by ABA even up to 3 days after application. The results are discussed in relation to the mode of action of ABA.
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Stewart et al. (1972) studied this question.