Causes of phytotoxicity of metsulfuron-methyl bound residues in soil

• Published in: Environmental pollution (1987) Vol. 126; no. 3; pp. 417 - 423
• Main Authors: Ye, Qingfu, Sun, Jinhe, Wu, Jianmin
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2003; Elsevier
• Subjects: Animal, plant and microbial ecology; Applied ecology; Arylsulfonates - toxicity; Bioavailability; Biodegradation, Environmental; Biological and medical sciences; Bound residue; Brassica - drug effects; Brassica - growth & development; Brassica napus; Degradation; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on plants and fungi; Environmental Monitoring - methods; Fundamental and applied biological sciences. Psychology; Herbicides - toxicity; Metsulfuron-methyl; Non agrochemicals pollutants; Phytopathology. Animal pests. Plant and forest protection; Phytotoxicity; Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors; Pollution effects. Side effects of agrochemicals; Soil Pollutants - toxicity; Bound residue; Degradation; Metsulfuron-methyl; Phytotoxicity; Bioavailability; Bioassay; Bioavailabilily; Growth; Pesticides; Soil pollution; Herbicide; Cruciferae; Dicotyledones; Angiospermae; Sulfonylureas; Brassica napus; Spermatophyta; Oil plant (vegetal)
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/S0269-7491(03)00233-1

The bioavailability and phytotoxicity of bound residues of metsulfuron-methyl were studied using 14C-labeling and bioassay with oil rape ( Brassica napus L.). Soil bound residues at the concentration of 0.27 and 0.53 nmol g −1 resulted in significant inhibition of oil rape seedling growth. The biologically active component of the bound residues was identified to be metsulfuron-methyl parent compound. Other metabolites, including the hydrolysis product 2-methylformate-benzenesulfonamide, showed no toxicity to the test species. This study suggests that residues of metsulfuron-methyl bound previously to the soil matrix could be again released upon planting. The phytotoxicity of metsulfuron-methyl bound residues was mainly caused by the metsulfuron-methyl parent compound that became available during plant growth. Residues of metsulfuron-methyl previously bound to the soil matrix can be released during plant growth.