Basis for soybean tolerance to thifensulfuron methyl

Brown, H. M.; Wittenbach, Vernon A.; Forney, D. Raymond; Strachan, Stephen

doi:10.1016/0048-3575(90)90137-q

Cited by 31 publications

(31 citation statements)

References 16 publications

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“…Conversely, esters may be herbicidal per se and the resultant hydrolysis products inactive. 33 Other hydrolytic and reductive reactions can be found in the further processing of pesticide residues following primary oxidative attack. However, they feature less commonly in the initial metabolism of pesticides.…”

Section: Other Primary Reactions Of Agrochemicalsmentioning

confidence: 99%

Detoxification and activation of agrochemicals in plants

Cole¹

1994

Pestic. Sci.

122

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Plants are able to metabolize agrochemicals and other foreign compounds by a variety of mechanisms and with extraordinary species diversity. Minor structural alterations of these compounds can bring about dramatic and unpredictable changes in the routes of their metabolism. The enzymes responsible for this exist in multiple forms which renders prediction of herbicide metabolism and, therefore, of selectivity, difficult. In some notable instances, pesticides are activated by plant metabolism. In the main, however, mechanisms such as hydroxylation, dealkylation and glutathione conjugation bring about detoxification and form the basis of herbicide selectivity. The properties of oxygenating and conjugating enzymes in plants are highlighted, with emphasis on the evident narrow substrate specificities, species differences and physiological roles. The molecular cloning of the genes specifying these enzymes will permit a much better definition of these mechanisms and will illuminate the natural roles of the enzymes involved. The prospects for utilizing recombinant enzymes as tools for the rational design of new selective herbicides are discussed. Herbicide safeners can protect certain crops from herbicide injury by promoting herbicide metabolism. The precise mechanisms of safener action and the reasons for their specificity are attracting much interest but are at present obscure. Natural variation in detoxification abilities of weed populations has allowed the field selection of some biotypes resistant to repeatedly used herbicides. By analogy, the introduction of microbial detoxification genes into major crops through genetic transformation has created new herbicideresistant crops which will enhance the flexibility of herbicide usage. CI OCH, David J . Cole Chbrsuhmn 'N=( W CY tolerant \ broadleaves CI \ 4 CH2W

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Section: Other Primary Reactions Of Agrochemicalsmentioning

confidence: 99%

Detoxification and activation of agrochemicals in plants

Cole¹

1994

Pestic. Sci.

122

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“…Thus, the herbicide propachlor in soybean seedlings forms a conjugate with homoglutathione (Lamoureux and Rusness, 1989). Homoglutathionic conjugate, as the main product of chlorimuron-ethyl transformation, is formed in soybean plants (Brown and Neighborns 1987;Brown et al, 1990). Homoglutathionic conjugates of acetochlor are formed by other plants, in particular by soybean, mung bean, and alfalfa (Medicago sativa) (Breaux, 1987).…”

Section: Conjugation Of Xenobiotics With Peptidesmentioning

confidence: 97%

“…Metabolism of three derivatives of sulfonylurea in soybean plants indicated that intensities of cleavage of the esteric bonds are di!erent (Brown and Neighbors, 1987;Brown et al, 1990). Thifensulfuron-methyl is intensely hydrolyzed by the formation of the corresponding thifensulfuronic acid.…”

Section: Reactions Of the Hydrolytic Cleavage Typementioning

confidence: 99%

Organic Toxicants and Plants

Körte¹,

Kvesitadze²,

Ugrekhelidze³

et al. 2000

Ecotoxicology and Environmental Safety

119

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“…The ethyl ester of chlorimuronethyl is de-esterified, while the methyl ester of metsulfuron-methyl is not, even though both compounds possess a phenyl ring. It was speculated that soybeans are incompetent to de-esterify ortho phenyl methyl ester sulfonylureas but are capable of this reaction with certain higher phenyl esters and even the methyl ester of thiophene sulfonylureas [73]. The locoweeds, woolly loco (Astragalus mollissi-mus) and silky crazyweed (Oxytropis sericea), contribute to livestock poisoning in the western United States.…”

Section: Herbicidementioning

confidence: 99%

“…It is a short-residual herbicide, by virtue of its high susceptibility to microbial degradation in the soil. Soybeans metabolize thifensulfuron-methyl relatively rapidly, with half-life of 4-6 h (Table 4) [64]. The very sensitive species, including velvetleaf (Abutilon theophrasti), pigweed (Amaranthus retroflexus), and lambsquarters (Chenopodium album), metabolize the herbicide much more slowly, with half-lives greater than 48 h. Morning glory (Ipomoea purpurea), which is moderately sensitive, metabolizes thifensulfuron-methyl somewhat more rapidly but still more slowly (half-life of 30 h) than soybeans.…”

Section: Metabolism Of Sulfonylurea Herbicides In Weedsmentioning

confidence: 99%

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

Jablonkai¹

2015

Herbicides, Physiology of Action, and Safety

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The metabolic detoxication/bioactivation pathways, the levels and activity of enzymes, and endogenous cofactors mediating these reactions in crops have been well documented; however, much less evidence has been accumulated in weed species. The herbicide metabolism as a selectivity factor is summarized with special attention to acetyl-CoA carboxylases (ACCase)-inhibiting aryloxyphenoxypropionate, protoporphyrinogen IX oxidase (PPO) inhibitor, carotenoid biosynthesis inhibitor clomazone, and acetolactate synthase (ALS) inhibitor imidazolinone and sulfonylurea herbicides in various weed species. The metabolism-based herbicide resistance related to these herbicide classes is also discussed along with the role and level of metabolizing enzymes and cofactors in weed species.

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Basis for soybean tolerance to thifensulfuron methyl

Cited by 31 publications

References 16 publications

Detoxification and activation of agrochemicals in plants

Detoxification and activation of agrochemicals in plants

Organic Toxicants and Plants

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

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