Lack of Cross-Resistance of Imazaquin-Resistant Xanthium strumarium Acetolactate Synthase to Flumetsulam and Chlorimuron

Schmitzer, Paul R.; Eilers, R.J.; Cséke, Csaba

doi:10.1104/pp.103.1.281

Cited by 50 publications

(41 citation statements)

References 9 publications

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“…The control differences diagnosed in the resistant biotypes may be related to the differential affinity of the herbicide molecule with the enzyme target-site, due to the possible mutation of the ALS gene (Délye, 2013). Similar results were obtained in biotypes of Xanthium strumarium resistant to herbicides inhibitor of the ALS enzyme, where the resistant biotypes were less sensitive to herbicides of the chemical group of the imidazolinones, when compared to herbicides of the group of the sulfonylureas and triazolopyrimidines (Schmitzer et al, 1993).…”

Section: Crossed Resistancesupporting

confidence: 74%

Resistence of Radish Biotypes to Iodosulfuron and Alternative Control

et al. 2016

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-The repetitive use of iodosulfuron for the control of weeds in winter cereals in the south of Brazil has favored the emergence of resistant Raphanus sativus biotypes. The objective of this study was to evaluate: the response of Raphanus sativus biotypes susceptible and resistant to different dosages of iodosulfuron; the control of biotypes with alternative registered herbicides for the control of the species in crops of wheat, corn and soybean; and the existence of cross-resistance of the biotypes. Thus, four experiments were done in a greenhouse, with a completely randomized design and four replicates. The experimental units were composed of vases with a volumetric capacity of 0.75 L filled with substrate, containing a plant each. For the dose-response curve, three biotypes (factor A) and nine doses of the iodosulfuron herbicide (factor B) were used. For the alternative control, the recommendation was herbicides in pre or postemergence of the crops, and the crossedresistance was evaluated by using herbicides that inhibit the ALS enzyme of different chemical groups. The analyzed variables were control and shoot dry matter. GR 50 of the susceptible biotype (B 1 ) was 0.11 g a.i. ha -1 , whereas GR 50 of resistant biotypes (B 4 and B 13 ) was 102.9 and 86.8 g a.i. ha -1 of the iodosulfuron herbicide, respectively. The resistant biotypes presented crossed resistance to herbicides that inhibit the ALS enzyme, where the control can be efficient with the use of herbicides with different action mechanisms. Keywords:Raphanus sativus, dose-response, acetolactate synthase, weed. RESUMO -O uso repetido do herbicida iodosulfurom para controle de plantas daninhas em cereais de inverno no Sul do Brasil favoreceu o surgimento de biótipos de Palavras-chave:Raphanus sativus, dose-resposta, acetolactato sintase, planta daninha.

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Section: Crossed Resistancesupporting

confidence: 74%

Resistence of Radish Biotypes to Iodosulfuron and Alternative Control

et al. 2016

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“…fi ALS herbicide resistance has been observed worldwide, and the development of target site resistance resulting from repeated applications is probably the most signifi cant barrier to the long-term successful use of TSA fi herbicides (Gerwick and Kleschick 1991;Rubin 1996;Whitcomb 1999). Almost all cases of resistance to TSA herbicides or other ALS inhibitors are the result of an altered ALS enzyme that is less sensitive to inhibitors (Schmitzer et al 1993;Bernasconi et al 1995). Resistance is commonly the result of a point mutation within discrete conserved domains of the als gene, resulting in an altered target site and, thus, target site resistance.…”

Section: Mode Of Toxic Actionmentioning

confidence: 98%

Chemistry and Fate of Triazolopyrimidine Sulfonamide Herbicides

Jabusch

Tjeerdema

2008

Reviews of Environmental Contamination and Toxicology

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The triazolopyrimidine sulfonamide (TSA) herbicides were registered in the United States in 1993. Their mode of action is by inhibition of acetolactate synthase (ALS), an enzyme common to plants and microorganisms but not found in animals. ALS inhibitors include other herbicide families such as the sulfonylureas, imidazolinones, and pyrimidinyl thiobenzoates. In the 1970s, sulfonylureas were the first ALS inhibitors to be introduced to the market. Their discovery was greeted as a great achievement because of their ability to suppress weeds at extremely low application rates compared to previously used herbicides and with low toxicity risk to humans and wildlife. By 1991, the market value of ALS inhibitors had reached $1.3 billion (U.S.). However, some of the problems associated with their use include the induction of resistance in weed species to both ALS-inhibiting and alternative herbicides. ALS inhibitors have also been found to damage nontarget plants at residual levels that are below the detection limits of standard analytical methods (Saari et al. 1994; Whitcomb 1999).

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“…In 1991 a population ofX. strumarium in Mississippi was confirmed to be resistant to imazaquin in a soybean field that had received multiple applications of the herbicide over a 4 year period (Schmitzer et al, 1993). In 1992 bensulfuron resistant populations of Sagittaria montevidensis and Cyperus difformis were found in rice growing areas of California (Saari et al, 1994).…”

Section: Development Of Herbicide Resistance In North Americamentioning

confidence: 99%