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Type: Journal article
Title: Molecular basis of multiple resistance to ACCase-inhibiting and ALS-inhibiting herbicides in Lolium rigidum
Author: Tan, M.K.
Preston, C.
Wang, G.X.
Citation: Weed Research, 2007; 47(6):534-541
Publisher: Blackwell Publishing Ltd
Issue Date: 2007
ISSN: 0043-1737
Statement of
M-K Tan, C Preston, G-X Wang
Abstract: Herbicide resistance in Lolium rigidum is widespread across much of the agricultural land in Australia. As the incidence of herbicide resistance has increased, so has the incidence of multiple herbicide resistance. This reduces the herbicide options available for control of this weed. This study reports on the successful amplification and sequencing of the acetolactate synthase (ALS) gene of L. rigidum using primers designed from sequence information of related taxa. This enables, for the first time, the successful determination of a mutation in the ALS gene of this species that provides resistance to ALS-inhibiting herbicides. This mutation causes amino acid substitution at Trp574 (numbering standardised to Arabidopsis thaliana) to Leu which had been reported to confer a high level of resistance against all classes of ALS inhibitor herbicides. In addition, multiple resistance to ALS-inhibiting and acetyl-coenzyme A carboxylase-inhibiting herbicides is acquired through the independent accumulation of mutant alleles for the target sites. This may thus explain some of the irregular, mosaic resistance patterns that occur in this predominantly outcrossing species.
Keywords: aryloxyphenoxypropionate; cyclohexanedione; chlorsulfuron; sulfonylurea; imidazolinone; gene; point mutation resistance; ryegrass; sequence
Description: The definitive version is available at
RMID: 0020073619
DOI: 10.1111/j.1365-3180.2007.00591.x
Appears in Collections:Agriculture, Food and Wine publications

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