Abstract
Young vegetative red kidney bean, soybean, cowpea, wheat, and corn plants were grown for from 2 to 3 weeks in nutrient-solution cultures which contained various concentrations of 2,4-dichlorophenoxyacetic acid. This growth-regulator, in proportion to the concentration supplied, proved toxic to all species tested, reducing or inhibiting growth and causing distinct morphological changes in these plants. Cereal crops were slightly more resistant than broadleaved crops. The growth of broadleaved plants was decreased by concentrations as low as 0.15 p.p.m., and soybeans were dead after exposure to from 1 to 5 p.p.m. for from 8 to 10 days. Cereal plants were alive after 20 days in nutrient solutions containing 3 p.p.m. or more, though their dry weight was significantly decreased by the lowest concentrations in which they were grown, namely, 0.5 and 3.0 p.p.m. The broadleaved plants appeared to have resistance to the regulator, increasing slightly in the following order: kidney bean, soybean, and cowpea. Wheat a...
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