Journal or Publishing Institution: Phytochemistry
Study: http://www.ncbi.nlm.nih.gov/pubmed/22015254
Author(s): Rojano-Delgado, A.M., Cruz-Hipolito, H., De Prado, R., de Castro, M.D.L. and Franco, A.R.
Article Type: Peer Reviewed Study
Record ID: 2090
Abstract: Velvet bean (Mucuna pruriens, Fabaceae) plants exhibits an innate, very high resistance (i.e., tolerance) to glyphosate similar to that of plants which have acquired resistance to this herbicide as a trait. We analyzed the uptake of [(14)C]-glyphosate by leaves and its translocation to meristematic tissues, and used scanning electron micrographs to further analyze the cuticle and 3D capillary electrophoresis to investigate a putative metabolism capable of degrading the herbicide. Velvet bean exhibited limited uptake of glyphosate and impaired translocation of the compound to meristematic tissues. Also, for the first time in a higher plant, two concurrent pathways capable of degrading glyphosate to AMPA, Pi, glyoxylate, sarcosine and formaldehyde as end products were identified. Based on the results, the innate tolerance of velvet bean to glyphosate is possibly a result of the combined action of the previous three traits, namely: limited uptake, impaired translocation and enhanced degradation.
Keywords: Mucuna puriens, Amaranthus retroflexus, Glyphosate, Tolerance, Resistance, Metabolism, Degradation, Translocation, Capillary electrophoresis, Drug Dose-Response Relationship, Glycine, Herbicides, Molecular Structure, Mucuna, Shikimic Acid, Analogs & Derivatives, Pharmacology, Ultrastructure, Mucuna pruriens var. utilis, beans, electrons, formaldehyde, herbicide resistance, leaves, meristems
Citation: Rojano-Delgado, A.M., Cruz-Hipolito, H., De Prado, R., de Castro, M.D.L. and Franco, A.R., 2012. Limited uptake, translocation and enhanced metabolic degradation contribute to glyphosate tolerance in Mucuna pruriens var. utilis plants. Phytochemistry, 73, pp.34-41.
