Multiple Resistance to Dissimilar Herbicide Chemistries in a Biotype ofLolium rigidumDue to Enhanced Activity of Several Herbicide Degrading Enzymes

Preston, Christopher; Tardif, François J.; Christopher, Jack; Powles, Stephen B.

doi:10.1006/pest.1996.0016

Cited by 209 publications

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“…Indeed, grass weed control in wheat by some ACCase herbicides is based on differential rates of herbicide metabolism mediated by the cytochrome P450 and glutathione-S-transferase enzyme families (see Cole and Edwards, 2000). The evolution of enhanced rates of herbicide detoxification, mediated by cytochrome P450 monooxygenases, has previously been documented as a mechanism of evolved resistance to ACCase herbicides in L. rigidum (Preston et al, 1996) and Alopecurus Table 1). Relative survival is calculated by subtracting the survival (%) of original untreated lines from observed survival of diclofopmethyl selected lines.…”

Section: Discussionmentioning

confidence: 99%

“…Since the 1970s, L. rigidum control has been dominated by herbicides and many populations have evolved multiple-and crossresistance (Burnet et al, 1994;Preston et al, 1996;Neve et al, 2004), in some cases after as few as 3-4 herbicide applications (Gill 1995). In a large random survey conducted in 1998, 46% of L. rigidum populations were resistant to field application rates of the acetyl-coenzyme A caboxylase (ACCase) inhibiting herbicide diclofopmethyl (Llewellyn and Powles, 2001).…”

Section: Introductionmentioning

confidence: 99%

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High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

2005

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The frequency of phenotypic resistance to herbicides in previously untreated weed populations and the herbicide dose applied to these populations are key determinants of the dynamics of selection for resistance. In total, 31 Lolium rigidum populations were collected from sites with no previous history of exposure to herbicides and where there was little probability of gene flow from adjacent resistant populations. The mean survival frequency across all 31 populations following two applications of commercial rates (375 g ha À1 ) of the acetyl-coenzyme A carboxylase (ACCase) inhibiting herbicide, diclofop-methyl was 0.43%. Survivors from five of these populations were grown to maturity and seed was collected. Dose-response experiments compared population level resistance to diclofop-methyl in these selected lines with their original parent populations. A single cycle of herbicide selection significantly increased resistance in all populations (LD 50 R:S ratios ranged from 2.8 to 23.2), confirming the inheritance and genetic basis of phenotypic resistance. In vitro assays of ACCase inhibition by diclofop acid indicated that resistance was due to a non-target-site mechanism. Following selection with diclofop-methyl, the five L. rigidum populations exhibited diverse patterns of crossresistance to ACCase and ALS-inhibiting herbicides, suggesting that different genes or gene combinations were responsible for resistance. The relevance of these results to the management of herbicide resistance are discussed. Heredity (2005) 95, 485-492.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

2005

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“…In some areas more than 40% of cropping fields are infested with herbicide-resistant L. rigidum populations (Nietschke et al, 1996). Multiple herbicide resistant populations of L. rigidum can be simultaneously resistant to herbicides from more than 12 herbicide chemistries representing seven modes of action (Hall et al, 1994;Preston et al, 1996). The majority of cases of herbicide resistance in L. rigidum populations are to herbicides that inhibit acetyl-coenzyme A carboxylase (ACCase) or acetolactate synthase (ALS).…”

Section: Introductionmentioning

confidence: 99%

Evolution of herbicide resistance in weeds: initial frequency of target site-based resistance to acetolactate synthase-inhibiting herbicides in Lolium rigidum

2002

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The frequency of individuals resistant to two acetolactate synthase (ALS)-inhibiting herbicides in three previously untreated populations of Lolium rigidum was determined. The frequency of individuals resistant to the sulfonylurea herbicide sulfometuron-methyl varied from 2.2 × 10 −5 to 1.2 × 10 −4 and the frequency of individuals resistant to the imidazolinone herbicide imazapyr varied from 1 × 10 −5 to 5.8 × 10 −5 depending on the population. Application of sulfometu-

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“…The biochemical basis of ACCase herbicide resistance has been revealed in several populations to involve resistant ACCase (Matthews et al, 1990;Holtum et al, 1991;Tardif et al, 1993Tardif et al, , 1996. Many resistant populations can also have a nontarget site-based resistance mechanism of enhanced rates of ACCase herbicide metabolism (Tardif and Powles, 1994;Preston et al, 1996;Preston and Powles, 1998). L. rigidum is an obligate cross-pollinated plant and it is emphasized that individual plants and populations can accumulate resistance mechanisms.…”

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confidence: 99%

Diversity of Acetyl-Coenzyme A Carboxylase Mutations in Resistant Lolium Populations: Evaluation Using Clethodim

Yu¹,

Collavo²,

Zheng³

et al. 2007

Plant Physiol.

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Multiple Resistance to Dissimilar Herbicide Chemistries in a Biotype ofLolium rigidumDue to Enhanced Activity of Several Herbicide Degrading Enzymes

Cited by 209 publications

References 0 publications

High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

Evolution of herbicide resistance in weeds: initial frequency of target site-based resistance to acetolactate synthase-inhibiting herbicides in Lolium rigidum

Diversity of Acetyl-Coenzyme A Carboxylase Mutations in Resistant Lolium Populations: Evaluation Using Clethodim

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