Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 141, Issue -, Pages 84-89Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2016.12.002
Keywords
Large crabgrass; Nicosulfuron; Acetolactate synthase; Non-target-site based resistance
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Funding
- China Special Fund for Agro-scientific Research in the Public Interest [201303031]
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Large crabgrass is a major grass weed widely distributed across China. This weed infests maize fields and has evolved resistance to the acetolactate synthase (ALS)-inhibiting herbicide nicosulfuron due to continuous and intensive use. In this study, a total of 25 out of 26 large crabgrass populations collected from maize field demonstrated resistance to nicosulfuron. Amino acid modifications in ALS known to confer resistance to ALS-inhibiting herbicides in other weeds, were not found in the 9 tested resistant populations. The P450 inhibitor malathion significantly reversed resistance to nicosulfuron in 3 tested populations, indicating one or more P450s may be involved. Nicosulfuron was metabolized more rapidly in one resistant large crabgrass population than in a susceptible biotype. This demonstrates that the metabolic resistance mechanisms involving one or more P450s may be responsible for large crabgrass resistance to nicosulfuron in this biotype. (C) 2016 Elsevier Inc. All rights reserved.
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