Herbicide Resistant Weeds

Uptake, translocation and metabolism of 14C isoproturon in wheat, susceptible and resistant biotypes of Phalaris minor.

Singh, S., R. C. Kirkwood, G. Marshall, H. Brown (ed.), G. W. Cussans (ed.), M. D. Devine (ed.), S. O. Duke (ed.), C. Fernandez Quintanilla (ed.), A. Helweg (ed.), R. E. Labrada (ed.), M. Landes (ed.), P. Kudsk (ed.), and J. C. Streibig. 1996. Uptake, translocation and metabolism of 14C isoproturon in wheat, susceptible and resistant biotypes of Phalaris minor. Proceedings of the second international weed control congress, Copenhagen, Denmark, 25-28 June 1996. 1-4: 529-534.

Greenhouse studies compared the uptake, translocation and metabolism of isoproturon in wheat (cv. WH-147) and susceptible (S) and resistant (R) biotypes of Phalaris minor, using 14C radiolabelled isoproturon (0-2 kg/ha). Uptake and translocation increased significantly from 0 to 7 days, but no significant differences were observed between S and R biotypes. Metabolic work (using thin layer chromatography subjected to bio image analysis) indicated greater degradation of the parent compound by the R biotype. Since no target site alteration was observed, the cause of resistance was probably due to enhanced metabolic detoxification.