Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/27761
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Type: Journal article
Title: Resistance to diclofop-methyl in two Lolium spp. populations from Italy: studies on the mechanism of resistance
Author: Bravin, F.
Zanin, G.
Preston, C.
Citation: Weed Research, 2001; 41(5):461-473
Publisher: Blackwell Science Ltd
Issue Date: 2001
ISSN: 0043-1737
1365-3180
Statement of
Responsibility: 
F Bravin, G Zanin, C Preston
Abstract: The mechanisms of herbicide resistance were investigated in two diclofop-methyl-resistant Lolium spp. populations from central Italy, Roma ’94 and Tuscania ’97. These two populations were compared with two susceptible Italian populations (Vetralla ’94, Tarquinia ’97) and a resistant and a susceptible population from Australia, SLR31 and VLR1. The activity of acetyl Co-A carboxylase (ACCase) extracted from susceptible (S) or resistant (R) individuals from the Italian populations was inhibited by both aryloxyphenoxypropanoate (diclofop acid and fluazifop acid) and cyclohexanedione (sethoxydim) herbicides. Diclofop-methyl was rapidly de-esterified to diclofop acid at a similar rate in both R and S populations. In all populations, diclofop acid was subsequently degraded to other metabolites. The rate of degradation of diclofop acid was not significantly faster in R than in S populations; however, diclofop acid was degraded more completely in Roma ’94 and Tuscania ’97 compared with the S populations. Application of the mixed-function oxidase inhibitor 1-aminobenzotriazole (ABT) significantly enhanced diclofop-methyl toxicity towards both R populations, but not in S populations. However, enhanced herbicide metabolism does not completely account for the measured resistance level. A mechanism other than an altered ACCase and enhanced herbicide metabolism appears to be responsible for resistance to diclofop-methyl in Roma ’94 and Tuscania ’97.
Keywords: Lolium spp.; herbicide resistance; diclofop-methyl; ACCase; aminobenzotriazole
Description: The definitive version is available at www.blackwell-synergy.com
RMID: 0020010068
DOI: 10.1046/j.1365-3180.2001.00250.x
Appears in Collections:Agriculture, Food and Wine publications

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