Publication Date: 2016.
BACKGROUND: Soon after the commercial release of sunflower cultivars resistant to imidazolinone herbicides, several uncontrolled feral radish (Raphanus sativus L.) populations were found in south-eastern Buenos Aires, Argentina. These populations were studied in field, glasshouse and laboratory experiments aiming to characterise their resistance profile and to develop management tools. RESULTS: Three feral radish accessions were highly resistant to ten active ingredients of five families of acetohydroxyacid synthase (AHAS)-inhibiting herbicides. Sequence analysis of the AHAS gene detected a Trp574Leu mutation in all resistant accessions. One accession with an intermediate level of resistance was heterozygous for this mutation, probably owing to gene exchange with a susceptible subpopulation located in the field margin. Herbicide-resistant and herbicide-susceptible radish could be controlled in sunflower by alternative herbicides. CONCLUSION: This is the first report of feral radish with resistance to herbicides belonging to all the AHAS-inhibiting herbicide families, conferred by Trp574Leu mutation in the AHAS gene. An appropriate herbicide rotation with alternative herbicides such as fluorochloridone or aclonifen and an increase in the diversity of cropping systems are important for minimising the prevalence of these biotypes.
Author affiliation: Pandolfo, Claudio Ezequiel. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigación Científica y Técnica; Argentina
Author affiliation: Presotto, Alejandro. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigación Científica y Técnica; Argentina
Author affiliation: Moreno, Florencia. BASF Argentina S.A.; Argentina.
Author affiliation: Dossou, Ida. DNA LandMarks Inc.; Canada
Author affiliation: Migasso, Juan P. BASF Argentina S.A.; Argentina
Author affiliation: Sakima, Ernesto. BASF Argentina S.A.; Argentina
Author affiliation: Cantamutto, Miguel Angel. INTA. Estación Experimental Agropecuaria Hilario Ascasubi; Argentina. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigación Científica y Técnica; Argentina
Repository: INTA Digital (INTA). Instituto Nacional de Tecnología Agropecuaria