Abstract
The effect of polyethylene glycol (PEG‐6000), abscisic acid (ABA), 2‐chloroethylphosphonic acid (ethephon) and 1‐aminocyclopropane‐1‐carboxylic acid (ACC) on the germination of Amaranthus caudatus L. seeds was examined. Both PEG‐6000 and ABA inhibited the rate and percentage of seed germination. ABA potentiated the effect of PEG. Ethephon was highly effective in reversing the inhibitory effect of PEG and ABA or combinations of both. ACC relieved inhibition by ABA and the combined effect of ABA and PEG. Aminoethoxyvinylglycine (AVG) increased the inhibition of seed germination caused by ABA. The inhibition of seed germination by ABA seems to be related more or less to ethylene biosynthesis or is associated with a change of tissue sensitivity to ethylene. The possibility of ethylene control of water uptake by seeds is also considered.
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