Translocation of Glyphosate and Quizalofop and Metabolism of Quizalofop in Quackgrass Biotypes (<i>Elytrigia repens</i>)

Tardif, François J.; Leroux, Gilles

doi:10.1017/s0890037x00027275

Cited by 13 publications

(11 citation statements)

References 14 publications

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“…Substantial uptake of glyphosate by quackgrass was observed in other studies and was 63 to 78% of applied herbicide 2 DAT (17). In addition 80% of glyphosate was absorbed by quackgrass 7 OAT and foliar uptake was similar among five biotypes (32). In hemp dogbane (Apocynum cannabinum L.), uptake increased from 13 to 59% between 0.5 and 12 d (24).…”

Section: Resultsmentioning

confidence: 86%

Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Tucker

Langeland²,

Corbin

1994

Weed technol.

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The absorption and translocation of the isopropylamine salts of14C-glyphosate and14C-imazapyr were compared in established terrestrial alligatorweed. Results indicated that more than twice as much imazapyr as glyphosate was absorbed by treated leaves of alligatorweed. In addition, more imazapyr was translocated to the underground storage tissues in alligatorweed than was glyphosate. This difference in translocation to roots and subterranean storage tissues is proposed as a mechanism for tolerance of alligatorweed to glyphosate and susceptibility to imazapyr.

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Section: Resultsmentioning

confidence: 86%

Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Tucker

Langeland²,

Corbin

1994

Weed technol.

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“…Growth stage has been shown to affect absorption and translocation of 14 C-glyphosate in both weeds and crops (Davis et al 1979;Tardiff and Leroux 1991). There appears to be no direct relationship of growth stage and glyphosate behavior; instead, the effect of plant growth stage on glyphosate movement seems to be species dependent.…”

mentioning

confidence: 99%

Absorption and translocation of glyphosate in glyphosate-resistant cotton as influenced by application method and growth stage

Pline

Price

Wilcut³

et al. 2001

Weed Science

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The influence of herbicide placement and plant growth stage on the absorption and translocation patterns of 14C-glyphosate in glyphosate-resistant cotton was investigated. Plants at four growth stages were treated with 14C-glyphosate on a 5-cm2 section of the stem, which simulated a postemergence-directed spray (PDS) application, or on the newest mature leaf, which simulated a postemergence (POST) application. Plants were harvested 3 and 7 d after treatment and divided into the treated leaf or treated stem, mature leaves, immature leaves and buds, stems, roots, fruiting branches (including the foliage on the fruiting branch), squares, and bolls. The PDS versus POST application main effect on absorption was significant. Absorption of 14C-glyphosate applied to stem tissue was higher in PDS applications than in POST applications. Plants receiving PDS applications absorbed 35% of applied 14C-glyphosate, whereas those receiving POST applications absorbed 26%, averaged over growth stages at application. Absorption increased from the four-leaf growth stage to the eight-leaf stage in POST applications but reached a plateau at the eight-leaf stage. Plants with PDS applications showed an increase in absorption from the four- to eight- to twelve-leaf stages and reached a plateau at the 12-leaf stage. Translocation of 14C-glyphosate to roots was greater at all growth stages with PDS treatments than with POST treatments. Herbicide placement did not affect translocation of 14C-glyphosate to squares and bolls. Squares and bolls retained 0.2 to 3.7% of applied 14C-glyphosate, depending on growth stage. Separate studies were conducted to investigate the fate of foliar-applied 14C-glyphosate at the four- or eight-leaf growth stages when harvested at 8- or 10-leaf, 12-leaf, midbloom (8 to 10 nodes above white bloom), and cutout (five nodes above white bloom, physiological maturity) stages. Thirty to 37% of applied 14C-glyphosate remained in the plant at cutout in four- and eight-leaf treatment stages, respectively. The concentration of 14C-glyphosate in tissue (Bq g−1 dry weight basis) was greatest in mature leaves and immature leaves and buds in plants treated at the four-leaf stage. Plants treated at the eight-leaf stage and harvested at all growth stages except cutout showed a higher concentration of 14C-glyphosate in squares than in other plant tissue. Accumulation of 14C-glyphosate in squares reached a maximum of 43 Bq g−1 dry weight at harvest at the 12-leaf stage. This concentration corresponds to 5.7 times greater accumulation of 14C-glyphosate in squares than in roots, which may also be metabolic sinks. These data suggest that reproductive tissues such as bolls and squares can accumulate 14C-glyphosate at higher concentrations than other tissues, especially when the herbicide treatment is applied either POST or PDS during reproductive stages (eight-leaf stage and beyond).

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“…Selective action of quizalofop-ethyl in a sensitive (Biotype 10) and a less sensitive (Biotype 2) quackgrass (Elytrigia repens) biotypes was partially attributed to differential rates of metabolism [20]. Conversion of the relatively inactive applied form (quizalofop-ethyl) to the biologically active form (quizalofop) occurred rapidly and further conversion of quizalofop to polar metabolites occurred more slowly.…”

Section: Metabolism and Selectivity Of Accase Inhibitor Aryloxyphenoxmentioning

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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Translocation of Glyphosate and Quizalofop and Metabolism of Quizalofop in Quackgrass Biotypes (Elytrigia repens)

Cited by 13 publications

References 14 publications

Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Absorption and translocation of glyphosate in glyphosate-resistant cotton as influenced by application method and growth stage

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

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Translocation of Glyphosate and Quizalofop and Metabolism of Quizalofop in Quackgrass Biotypes (Elytrigia repens)

Cited by 13 publications

References 14 publications

Absorption and Translocation of14C-Imazapyr and14C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Absorption and Translocation of14C-Imazapyr and14C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Absorption and translocation of glyphosate in glyphosate-resistant cotton as influenced by application method and growth stage

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

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Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides

Absorption and Translocation of¹⁴C-Imazapyr and¹⁴C-Glyphosate in AlligatorweedAlternanthera philoxeroides