Uptake and translocation of carpropamid in rice (Oryza sativa L).
Translocation of the antiblast compound, carpropamid, was investigated in rice using [14C]carpropamid. When applied to the seed, carpropamid was not only readily absorbed but was translocated to different parts of the seedlings emerging from treated seeds. A substantial portion of fungicide appeared to be exuded onto the leaf surface. In 21-day-old plants grown from [14C]carpropamid-treated seeds, 27.2% of the radioactivity isolated from leaves was present on the surface of lamina. This exuded fraction is probably responsible for its action as a fungal anti-penetrant compound. Following 30-min root dipping of 14-day-old seedlings, carpropamid was rapidly absorbed and translocated throughout the seedling. Its intra-laminar distribution was uniform as determined by autoradiography. Only a small fraction (< 2%) of fungicide applied to the foliage was translocated beyond the site of application within the treated leaf. Translocation was primarily apoplastic. Approximately 54% of the radioactivity recovered from leaves was in the form of carpropamid. At least seven radiolabelled metabolic products were observed by TLC. Only 8.3% of radioactivity applied through the seeds could be recovered from 21-day-old seedlings.
Rohilla
R
R
Department of Plant Pathology, College of Agriculture, GB Pant University of Agriculture and Technology, Pantnagar 263 145, India.
Singh
U S
US
Singh
R L
RL
D000577:Amides / Q000493:pharmacokinetics*; D001345:Autoradiography; D002250:Carbon Radioisotopes / Q000493:pharmacokinetics; D002855:Chromatography, Thin Layer; D003521:Cyclopropanes / Q000493:pharmacokinetics*; D005122:Exudates and Transudates; D005659:Fungicides, Industrial / Q000493:pharmacokinetics*; D007553:Isotope Labeling; D012275:Oryza / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D012639:Seeds / Q000378:metabolism
D000577:Amides; D002250:Carbon Radioisotopes; D003521:Cyclopropanes; D005659:Fungicides, Industrial; C113565:carpropamid