Effect of Monuron and of Related Compounds on the Growth of Seedling Peas

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Abstract
Shoots of peas grown in phosphate buffer were no more sensitive to monuron applied continuously than were roots. They were, however, more readily damaged than roots when high monuron concentrations were applied for short periods of time. Neither root nor shoot was more sensitive to monuron in light than in darkness. The damage caused by a high monuron concentration was far greater at times, or under conditions, of high metabolic activity. The toxicities of alkyl or aryl substituted ureas and thioureas were closely related to their solubilities in water. In view of this similarity with physical poisons and the probable sites of their main toxic actions, it is considered more likely that they disrupt an integrating surface than that they act upon specific active groups of enzymes.

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