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RESEARCH ARTICLE

Molecular basis of multiple resistance to herbicides inhibiting acetyl-CoA carboxylase and acetolactate synthase in American sloughgrass (Beckmannia syzigachne) from China

Lang Pan A B , Haitao Gao A B , Han Wu A B and Liyao Dong A B C
+ Author Affiliations
- Author Affiliations

A College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.

B Key Laboratory of Integrated Pest Management in Crops in Eastern China (Ministry of Agriculture), Nanjing Agricultural University, Nanjing 210095, China.

C Corresponding author. Email: dly@njau.edu.cn

Crop and Pasture Science 67(11) 1208-1214 https://doi.org/10.1071/CP16109
Submitted: 24 March 2016  Accepted: 5 September 2016   Published: 7 October 2016

Abstract

American sloughgrass (Beckmannia syzigachne Steud.) is a problematic grass that is widely distributed in wheat and oilseed rape fields in China. The herbicides fenoxaprop-P-ethyl and mesosulfuron-methyl failed to control B. syzigachne JCWJ-R populations collected from a wheat field in Jiangsu Province. Dose-response experiments showed that JCWJ-R was resistant to the acetyl-CoA carboxylase (ACCase) inhibitors fenoxaprop-P-ethyl (33.8-fold), haloxyfop-R-methyl (12.7-fold), clethodim (7.8-fold) and pinoxaden (11.6-fold), and to the acetolactate synthase (ALS) inhibitors mesosulfuron-methyl (15.9-fold), pyroxsulam (17.6-fold), flucarbazone-Na (10.7-fold) and imazethapyr (7-fold). Resistance to ALS inhibitors was due to a Pro-197-Ser mutation in the ALS gene and resistance to ACCase inhibitors was due to an Ile-1781-Leu mutation in the ACCase gene. A derived cleaved amplified polymorphic sequence method was developed to detect the ALS mutation in B. syzigachne. This was combined with a previously established method to detect Ile-1781-Leu, and the mutation frequency and homozygous mutation rates in the JCWJ-R population were determined. The evolution of multiple resistance to ACCase and ALS inhibitors in this B. syzigachne population indicated that alternative methods should be developed to control resistant weeds.

Additional keywords: amino acid substitution, cross-resistance, herbicide resistance, target-site resistance.


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