Abstract
Summary Pea plants ( Pisum sativum L. cv. Koray) sensitive to triazine herbicides were treated with 140 and 14 mM atrazine solutions. Endogenous levels of the free and bound low- and high-molecular weight compounds putrescine, spermidine and spermine were determined 0, 6, 12, 24, 48, 144 and 240 hours after treatment. A rapid increase in quantities of free polyamines and polyamines bound with TCA-insoluble substances was observed at the first hours after herbicide spraying. At the same time the content of polyamines bound with TCA-soluble compounds decreased. At the end of the experimental period the total putrescine, spermidine and spermine levels were approximately 1.5 times that of the control. The atrazine-induced change in polyamine contents was dependent on the dose of the herbicide. The role of changed polyamine content under conditions of atrazine stress is discussed.
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