The effect of chlorffenprop‐methyl on 32P uptake, transport and metabolism in Avena fatua L. and Hordeum vulgare L.

Summary: The eflect of chlorfenprop‐methyl on plant weight, root uptake, transport and metabolism of 32P in wild oat and barley plants was examined 4 h. 1, 3 and 9 days after treatment. The fresh weight of treated wild oat plants became significantly less than that of the controls by day 9. There was no significant effect on the weight of barley plants during this period. Uptake of 32P by treated wild oat planus progressively decreased during the experiment and by day 9 was significantly 70% less yhan that in the control: uptake by barley plants showed a significant 30% increase by day 9. Transport of 32P to the shoots followed a similar pattern. In wild oat plants, transport was significantly inhibited at all sampling dales by 44–91%. In barley plants. 32P transport to the shoots tended to be enhanced by day 9 after herbicide treatment. Metabolism of 32P in wild oat plants was affected 4 h after treatment. The content of 32‐P in individual fractions (inorganic, organic, lipidic, and nucleic acid P) was lower in treated plants, especially in the shools. In barley plants. 32P incorporation into the individual fractions was initially inhibited 4 h after treatment, but later corresponded to that found in the control.