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Seedlings of Solanum scabrum Mill. and Solanum ptycanthum Dun. were treated with [14C]ethalfluralin (N-ethyl-α,α,α-trifluoro-N-(methylallyl)-2,6-dinitro-p-toluidine) and [14C]trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) supplied in nutrient solution to determine the basis for differences in response by these two species to these two herbicides. Plants of S. scabrum absorbed more [14C]ethalfluralin and [14C]trifluralin than plants of S. ptycanthum. During the first 24 h, S. scabrum seedlings, but not S. ptycanthum seedlings absorbed more [14C]ethalfluralin than did plants treated with [14C]trifluralin. More [14C]ethalfluralin than [14C]trifluralin was found in the shoots of plants of both species. Seventy-two hours after treatment with [14C]herbicides, the conversion to water-soluble metabolites was greater for [14C]ethalfluralin than for [14C]trifluralin. In the shoots of plants from both species an average of nearly 55% of the 14C recovered was found in the water-soluble fraction following [14C]ethalfluralin treatment whereas an average of only 40% was found in the water-soluble fraction following [14C]trifluralin treatment. |
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