Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 117, Issue -, Pages 68-74Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2014.10.012
Keywords
Acetohydroxy acid synthase (AHAS); AHAS herbicides; Mutation diversity; Flixweed
Categories
Funding
- Special Fund for Agro-scientific Research in the Public Interest [201303031]
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Flixweed (Descurainia Sophia L) is a problematic weed in winter wheat fields in China, which causes great loss of wheat yield. A total of 46 flixweed accessions from winter wheat-planting areas were collected and used for the survey of resistance to tribenuron-methyl and Pro197 mutation diversity. According to the R resistance rating system, 16 flixweed accessions have evolved resistance to tribenuron-methyl, 13 accessions have high risk of developing resistance to this herbicide and 17 accessions are susceptible. The mutation of Pro197 codon (CCT) changed proline (Pro) into leucine (Leu) (homozygous, RR), serine (Ser, RR), histidine (His, RR), threonine (Thr, RR), Pro/Leu (heterozygous, RS), Pro/Ser (RS), Pro/His, Pro/Thr (RS) and Pro/Tyr (RS). Among these amino acid changes, a Pro197-Pro/Tyr (heterozygous, RS) substitution caused by the mutation of two successive nucleotides was identified for the first time in resistant weed species. In addition, the Pro197-His and Pro197-Pro/His mutations have not been reported previously in flixweed. Finally, a CPAS marker was developed to identify flixweed plants with or without Pro197 mutation. (C) 2014 Elsevier Inc. All rights reserved.
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