Hostname: page-component-5d84bcc8dc-6bbr8 Total loading time: 0 Render date: 2026-09-11T23:21:25.910Z Has data issue: false hasContentIssue false

Resistance Mechanism to Tribenuron-Methyl in White Mustard (Sinapis alba) from Southern Spain

Published online by Cambridge University Press:  20 January 2017

Hugo Cruz-Hipolito*
Affiliation:
Department of Agricultural Chemistry and Edaphology, University of Córdoba, Spain 14071
Jesus Rosario
Affiliation:
Instituto Dominicano de Investigaciones Agropecuarias y Forestales, Dominican Republic
Gerardina Ioli
Affiliation:
Department of Agricultural Chemistry and Edaphology, University of Córdoba, Spain 14071
Maria D. Osuna
Affiliation:
Centro de Investigación Finca La Orden-Valdesequera, Spain
Reid J. Smeda
Affiliation:
Department of Plant Sciences, University of Missouri, Columbia, MO 65211
Fidel González-Torralva
Affiliation:
Department of Agricultural Chemistry and Edaphology, University of Córdoba, Spain 14071
Rafael De Prado
Affiliation:
Department of Agricultural Chemistry and Edaphology, University of Córdoba, Spain 14071
*
Corresponding author's E-mail: cruzhipolito@yahoo.com.mx

Abstract

Tribenuron-methyl has been used widely for the last 15 yr to control white mustard in cereal crops from southern Spain. Since 2007, several cases of tribenuron-methyl resistance have been reported in wheat fields. Greenhouse and laboratory studies were conducted to characterize the mechanism of suspected tribenuron-methyl resistance in a white mustard biotype (hereafter AR16) from Malaga (southern Spain). Under greenhouse conditions, the dose (g ai ha−1) inhibiting fresh weight by 50% (ED50) was 5.20 and 0.57 for the AR16 and AR3 (known susceptible) biotypes, respectively. With the use of 14C-tribenuron-methyl, absorption and translocation from treated leaves were similar between biotypes. Thin-layer chromatography indicated foliar metabolism of tribenuron-methyl was low in both R and S biotypes. Assays on the binding affinity of tribenuron-methyl on acetolactate synthase (ALS) revealed enzyme activity was reduced by 50% (I50 value) at 638.7 and 0.23 nM for the AR16 and AR3 biotypes, respectively. This resulted in 2,777-fold greater resistance to tribenuron-methyl for the AR16 compared to AR3 biotype. Sequencing the gene encoding ALS, a proline/serine amino-acid substitution, was detected in position 197 of the A domain. Based on these results, it is concluded that tribenuron-methyl resistance in the AR16 biotype is due to a target-site mutation in the ALS enzyme, resulting in a lack of affinity to tribenuron-methyl.

Information

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable