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Solanum ptycanthum resistance to acetolactate synthase inhibitors

Published online by Cambridge University Press:  20 January 2017

Dean S. Volenberg
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
Chris M. Boerboom
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706

Abstract

Solanum ptycanthum plants putatively resistant to acetolactate synthase (ALS) inhibitors were identified in a Wisconsin Glycine max field in 1999. Three- to four-leaf-stage S. ptycanthum plants in the greenhouse were 150, 120, and 5.9-fold resistant to imazethapyr, imazamox, and primisulfuron, respectively, compared with susceptible plants. In vivo ALS was 170- and less than 20-fold more resistant to imazethapyr and primisulfuron, respectively. These results suggested that the S. ptycanthum accession was highly resistant to imazethapyr and imazamox, and that resistance was associated with insensitive ALS. This is the first confirmed occurrence worldwide of S. ptycanthum resistance to ALS inhibitors.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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