IAL   21557
INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
RETENTION, UPTAKE AND TRANSLOCATION OF GLYPHOSATE IN Parietaria debilis G. Forst.
Autor/es:
DELLAFERRERA, IGNACIO; CHRISTOFFOLETI, PEDRO; GONZÁLEZ-TORRALVA, FIDEL; PERRETA, MARIEL; DE PRADO, RAFAEL
Reunión:
Workshop; International Workshop on “European status and solutions for glyphosate resistance"; 2012
Institución organizadora:
Universidad de Cordoba
Resumen:
The selection pressure imparted by glyphosate will cause weed shifts attributable to the natural tolerance of a particular species to glyphosate or the evolution of glyphosate resistance within the weed population. Mechanisms by which weeds are naturally tolerant to glyphosate are not well defined, and research investigating these mechanisms is limited. Parietaria debilis is a weed found in glyphosate resistant soybean production systems, this species exibit a high tolerance to glyphosate compared with others common sensible species. Dose response assay shows a glyphosate tolerance ratio [ED50 (P. debilis)/ED50 (A. hybridus)] of 11; and the shikimic acid accumulation shows 14,5 fold the concentration in leaves of a sensible species at 96 hours after glyphosate aplication, that confirm the herbicide tolerance and the inhibition of the EPSPs respectively. Foliar retention assays shows less herbicide remained in leaves in P.debilis than in A. hybridus. 93% of applied 14C glyphosate penetrate in A. hybridus at 96 HAT meanwile P. debilis only absorb 55%, at same time the tolerant species translocation is 15% of absorbed 14C glyphosate against 68 % of the sensible one. The mechanisms involved in P. debilis lack of sensitiveness found in this work are the minor foliar retention, lack of absorption and reduced traslocation of herbicide.