title: Uptake of 2,4-D in higher plants from artificial rain.
abstract: Sinapis alba L., Lapsana communis L., Achillea millefolium L., Brassica napus L., Lactuca sativa L., and Lycopersicum esculentum L. were exposed to 2,4-dichlorophenoxy [2-14C]acetic acid (2,4-D) at 10 micrograms liter-1 in artificial rain, pH 6.5 and 3.3. The 2,4-D was absorbed in all species tested. Concentrations of parent 2,4-D appeared at the highest level in Achillea (0.1 mg kg-1 dry wt), and at zero level in Lycopersicum. Twenty-one daily treatments at pH 6.5 for 30-min periods increased dry-matter concentrations (P less than or equal to 0.05) in the leaves of Achillea and decreased those in Brassica. No change in dry-matter concentration was observed in the leaves of Brassica by seven daily treatments for 30-min periods at pH 3.3.
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D002250:Carbon Radioisotopes; D006863:Hydrogen-Ion Concentration; D010944:Plants / Q000378:metabolism*; D011891:Rain; D014887:Weather
chemical_list: D002250:Carbon Radioisotopes; D002245:Carbon Dioxide; D015084:2,4-Dichlorophenoxyacetic Acid