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https://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 |
DOI: | 10.1046/j.1365-3180.2001.00250.x |
Published version: | http://dx.doi.org/10.1046/j.1365-3180.2001.00250.x |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 2 |
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