Point mutation in acetolactate synthase confers sulfonylurea and imidazolinone herbicide resistance in spiny annual sow-thistle [Sonchus asper (L.) Hill] Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/m900nv116

This is the publisher’s final pdf. The published article is copyrighted by the Agricultural Institute of Canada and can be found at:  http://pubs.aic.ca/journal/cjps.

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  • Suspected thifensulfuron resistant spiny annual sow-thistle was identified near Colfax, Washington, in two fields with a winter wheat and lentil rotation. Therefore, studies were conducted to examine resistance of spiny annual sow-thistle to thifensulfuron and cross-resistance to other acetolactate synthase inhibitors and to determine the physiological and molecular basis for herbicide resistance. Whole-plant bioassay confirmed that the biotype was highly resistant to the sulfonylurea (SU) herbicides, thifensulfuron, metsulfuron, and prosulfuron. The resistant (R) biotype was also highly resistant to the imidazolinone (IMI) herbicides, imazamox and imazethapyr. An in vivo acetolactate synthase (ALS) assay indicated that the concentrations of SU and IMI herbicides required for 50% inhibition (I₅₀) were more than 10 times greater for R biotype compared with susceptible (S) biotype. Analysis of the nucleotide and predicted amino acid sequences for ALS genes demonstrated a single-point mutation from C to T at the als1 gene, conferring the substitution of the amino acid leucine for proline in the R biotype at position197. The results of this research indicate that the resistance of spiny annual sow-thistle to SU and IMI herbicides is due to on altered target site and caused by a point mutation in the als1 gene
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  • Park, K. W., Kolkman, J. M. and Mallory-Smith, C. A. 2012. Point mutation in acetolactate synthase confers sulfonylurea and imidazolinone herbicide resistance in spiny annual sow-thistle [Sonchus asper (L.) Hill]. Can. J. Plant Sci. 92: 303–309
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2013-04-09T00:08:43Z No. of bitstreams: 1 Mallory-SmithCarolCropSoilSciencePointMutationAcetolactate.pdf: 239325 bytes, checksum: 3499ab41164720ae3f5b2d1124b03254 (MD5)
  • description.provenance : Made available in DSpace on 2013-04-09T00:09:21Z (GMT). No. of bitstreams: 1 Mallory-SmithCarolCropSoilSciencePointMutationAcetolactate.pdf: 239325 bytes, checksum: 3499ab41164720ae3f5b2d1124b03254 (MD5) Previous issue date: 2012-03
  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2013-04-09T00:09:21Z (GMT) No. of bitstreams: 1 Mallory-SmithCarolCropSoilSciencePointMutationAcetolactate.pdf: 239325 bytes, checksum: 3499ab41164720ae3f5b2d1124b03254 (MD5)

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