《pp Different cross-resistance patterns to AHAS》.pdf

Pesticide Biochemistry and Physiology 112 (2014) 26–32 Contents lists available at ScienceDirect Pesticide Biochemistry and Physiology journal homepage: www.else /locate/pest Different cross-resistance patterns to AHAS herbicides of two tribenuron-methyl resistant flixweed (Descurainia sophia L.) biotypes in China Wei Deng, Yuan Cao, Qian Yang, Ming jie Liu, Yu Mei, Ming qi Zheng ⇑ Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China a r t i c l e i n f o a b s t r a c t Article history: Flixweed (Descurainia sophia L.) is a troublesome weed in winter wheat fields in China. Two flixweed Received 30 October 2013 accessions, HB08 and HB16 with a Pro-197-Leu and Pro-197-Ser AHAS-mutation respectively, have Accepted 21 May 2014 evolved very high levels resistance to sulfonylurea (SU) herbicide, tribenuron-methyl. Cross resistance Available online 2 June 2014 of HB08 and HB16 to AHAS herbicides of SU, imidazolinone (IMI), triazolopyrimidine (TP) and pyrimid- inyl-thiobenozoate (PTB) families was investigated by dose-response experiments. In addition, the effects Keywords: of AHAS herbicides on the activity of AHAS extracted from HB08 and HB16 plants were evaluated. HB16 AHAS enzyme exhibited cross resistance to SU herbicides halosulfuron-methyl and triasulfuron, TP herbicides flu