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- Title
Widespread occurrence of both metabolic and target-site herbicide resistance mechanisms in Lolium rigidum populations.
- Authors
Han, Heping; Yu, Qin; Owen, Mechelle J; Cawthray, Gregory R; Powles, Stephen B
- Abstract
BACKGROUND Lolium rigidum populations in Australia and globally have demonstrated rapid and widespread evolution of resistance to acetyl coenzyme A carboxylase ( ACCase)-inhibiting and acetolactate synthase ( ALS)-inhibiting herbicides. Thirty-three resistant L. rigidum populations, randomly collected from crop fields in a most recent resistance survey, were analysed for non-target-site diclofop metabolism and all known target-site ACCase gene resistance-endowing mutations. RESULTS The HPLC profile of [ 14C]-diclofop-methyl in vivo metabolism revealed that 79% of these resistant L. rigidum populations showed enhanced capacity for diclofop acid metabolism (metabolic resistance). ACCase gene sequencing identified that 91% of the populations contain plants with ACCase resistance mutation(s). Importantly, 70% of the populations exhibit both non-target-site metabolic resistance and target-site ACCase mutations. CONCLUSIONS This work demonstrates that metabolic herbicide resistance is commonly occurring in L. rigidum, and coevolution of both metabolic resistance and target-site resistance is an evolutionary reality. Metabolic herbicide resistance can potentially endow resistance to many herbicides and poses a threat to herbicide sustainability and thus crop production, calling for major research and management efforts. © 2015 Society of Chemical Industry
- Subjects
HERBICIDE resistance; LOLIUM rigidum; ACETYLCOENZYME A; AGRICULTURAL productivity; INTEGRATED pest control
- Publication
Pest Management Science, 2016, Vol 72, Issue 2, p255
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.3995