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Target-Site Resistance Mechanisms to Tribenuron-methyl and Cross-resistance Patterns to ALS-inhibiting Herbicides of Catchweed Bedstraw (Galium aparine) with Different ALS Mutations

Published online by Cambridge University Press:  18 December 2018

Wei Deng
Affiliation:
Doctor, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
Yingjie Di
Affiliation:
Graduate Student, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
Jingxuan Cai
Affiliation:
Graduate Student, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
Yueyang Chen
Affiliation:
Graduate Student, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
Shuzhong Yuan*
Affiliation:
Associate Professor, College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
*
Author for correspondence: Shuzhong Yuan, College of Horticulture and Plant Protection, Yangzhou University, No. 88 of Da Xue Nan Road, Hanjiang District, Yangzhou, China. (Email: yuansz10201@163.com)

Abstract

Catchweed bedstraw (Galium aparine L.) is a problematic dicot weed that occurs in major winter wheat (Triticum aestivum L.) fields in China. Tribenuron-methyl has been widely used to control broadleaf weeds since 1988 in China. However, overuse has led to the resistance evolution of G. aparine to tribenuron-methyl. In this study, 20 G. aparine populations collected from Shandong and Henan provinces were used to determine tribenuron-methyl resistance and target-site resistance mechanisms. In dose–response experiments, 12 G. aparine populations showed different resistance levels (2.92 to 842.41-fold) to tribenuron-methyl compared with the susceptible population. Five different acetolactate synthase (ALS) mutations (Pro-197-Leu, Pro-197-Ser, Pro-197-His, Asp-376-Glu, and Trp-574-Leu) were detected in different resistant populations. Individuals heterozygous for Pro-197-Ser and Trp-574-Leu mutations were also observed in a resistant population (HN6). In addition, pHB4 (Pro-197-Ser), pHB7 (Pro-197-His), pHB8 (Pro-197-Leu), pHB5 (Asp-376-Glu), and pHB3 (Trp-574-Leu) subpopulations individually homozygous for specific ALS mutations were generated to evaluate the cross-resistance to ALS-inhibiting herbicides. The pHB4, pHB7, pHB8, pHB5, and pHB3 subpopulations all were resistant to sulfonylurea, pyrazosulfuron-ethyl, triazolopyrimidine, flumetsulam, sulfonylamino-carbonyl-triazolinone, flucarbazone-sodium, pyrimidinyl thiobenzoate, pyribenzoxim, and the imidazolinone imazethapyr. These results indicated the diversity of the resistance-conferring ALS mutations in G. aparine, and all these mutations resulted in broad cross-resistance to five kinds of ALS-inhibiting herbicides.

Information

Type
Research Article
Copyright
© Weed Science Society of America, 2018 

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