Transgenic glyphosate-resistant oilseed rape (Brassica napus) as an invasive weed in Argentina: detection, characterization, and control alternatives

Abstract The presence of glyphosate-resistant oilseed rapepopulations in Argentina was detected and characterized.The resistant plants were found as weeds in RR soybeansand other fields. The immunological and molecular analysisshowed that the accessions presented the GT73 transgenicevent. The origin of this event was uncertain, as the cultivationof transgenic oilseed rape cultivars is prohibited in Argentina.This finding might suggest that glyphosate resistance couldcome from unauthorized transgenic oilseed rape crops cultivatedin the country or as seed contaminants in imported oilseedrape cultivars or other seed imports. Experimentationshowed that there are alternative herbicides for controllingresistant Brassica napus populations in various situationsand crops. AHAS-inhibiting herbicides (imazethapyr,chlorimuron and diclosulam), glufosinate, 2,4-D, fluroxypyrand saflufenacil proved to be very effective in controllingthese plants. Herbicides evaluated in this research wereemployed by farmers in one of the fields invaded with this biotype and monitoring of this field showed no evidence of itspresence in the following years.

Fil: Pandolfo, Claudio Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina

Fil: Presotto, Alejandro Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina

Fil: Torres Carbonell, Francisco Javier. Universidad Nacional del Sur. Departamento de Agronomía; Argentina

Fil: Ureta, Maria Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina

Fil: Poverene, María Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina

Fil: Cantamutto, Miguel Ángel. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Hilario Ascasubi; Argentina