title: Different cross-resistance patterns to AHAS herbicides of two tribenuron-methyl resistant flixweed (Descurainiasophia L.) biotypes in China.
abstract: Flixweed (Descurainiasophia L.) is a troublesome weed in winter wheat fields in China. Two flixweed accessions, HB08 and HB16 with a Pro-197-Leu and Pro-197-Ser AHAS-mutation respectively, have evolved very high levels resistance to sulfonylurea (SU) herbicide, tribenuron-methyl. Cross resistance of HB08 and HB16 to AHAS herbicides of SU, imidazolinone (IMI), triazolopyrimidine (TP) and pyrimidinyl-thiobenozoate (PTB) families was investigated by dose-response experiments. In addition, the effects of AHAS herbicides on the activity of AHAS extracted from HB08 and HB16 plants were evaluated. HB16 exhibited cross resistance to SU herbicides halosulfuron-methyl and triasulfuron, TP herbicides flumetsulam and penoxsulam, but displayed more sensitivity to IMI herbicide imazethapyr. By contrast, HB08 only showed cross resistance to SU herbicides halosulfuron-methyl and triasulfuron. The in vitro sensitivity of AHAS to AHAS herbicides is consistent with the results of dose-response experiments and the estimated Pearson's r values for HB08 and HB16 are 0.996 and 0.912 respectively. These indicated that altered AHAS sensitivity was responsible mainly for cross resistance patterns observed in the two resistant biotypes.
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China.
authors: Wei
authors: W
authors: Deng
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China.
authors: Yuan
authors: Y
authors: Cao
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China.
authors: Qian
authors: Q
authors: Yang
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China.
authors: Ming Jie
authors: MJ
authors: Liu
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China.
authors: Yu
authors: Y
authors: Mei
authors: Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China. Electronic address: mqzheng@cau.edu.cn.
authors: Ming Qi
authors: MQ
authors: Zheng
mesh_terms: D000095:Acetolactate Synthase / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D019943:Amino Acid Substitution; D001190:Arylsulfonates / Q000494:pharmacology*; D019607:Brassicaceae / Q000145:classification / Q000235:genetics* / Q000254:growth & development; D002681:China; D004305:Dose-Response Relationship, Drug; D053209:Herbicide Resistance / Q000235:genetics*; D048288:Imidazolines / Q000494:pharmacology; D009154:Mutation; D010940:Plant Proteins / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D057685:Plant Weeds / Q000145:classification / Q000235:genetics* / Q000254:growth & development; D011743:Pyrimidines / Q000494:pharmacology; D013045:Species Specificity; D013453:Sulfonylurea Compounds / Q000494:pharmacology; D014230:Triazoles / Q000494:pharmacology; D000096926:Benzenesulfonamides
chemical_list: D000095:Acetolactate Synthase; D001190:Arylsulfonates; D048288:Imidazolines; D010940:Plant Proteins; D011743:Pyrimidines; D013453:Sulfonylurea Compounds; D014230:Triazoles; C532033:halosulfuron methyl; C050296:metsulfuron methyl; C094039:triasulfuron; D000096926:Benzenesulfonamides
keywords: AHAS enzyme; AHAS herbicides; Cross resistance; Flixweed