Physiological Basis for Differential Selectivity of Four Grass Species to Aminocyclopyrachlor

Parker, Ethan T.; Wehtje, Glenn; McElroy, J. Scott; Flessner, Michael L.; Panizzi, Peter

doi:10.1614/ws-d-15-00053.1

Cited by 3 publications

(4 citation statements)

References 38 publications

(46 reference statements)

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“…Parker et al (2015) Flessner et al (2011a) found injury consistent with other synthetic auxin-type herbicides that included growth stimulation and vascular inhibition.…”

Section: Invasive Plant Science and Management 85supporting

confidence: 53%

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Response of twelve Florida cogongrass (Imperata cylindrica) populations to herbicide treatment

Enloe

Lucardi

Loewenstein

et al. 2018

Invasive plant sci. manag.

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Cogongrass [Imperata cylindrica (L.) Beauv.] is an invasive grass in the southeastern United States, and its impacts strongly affect the region, especially Florida. Herbicide strategies have been limited to glyphosate in natural areas and imazapyr in managed pine forests and non-crop areas where its soil residual activity is of less concern. This lack of options has raised concern for herbicide resistance, which has never been documented for I. cylindrica. Land managers have also reported variable I. cylindrica control, especially with glyphosate. To determine whether herbicide resistance was a possible explanation, we examined glyphosate response of I. cylindrica from 12 Florida populations. We also tested aminocyclopyrachlor with and without glyphosate and flumioxazin with glyphosate. Results indicated that herbicide performance was similar across I. cylindrica populations: glyphosate and aminocyclopyrachlor reduced I. cylindrica biomass by 78% and 76%, respectively, and the combined tank mix reduced cogongrass biomass by 91%. Flumioxazin tank mixed with glyphosate did not improve control compared with glyphosate alone. There were no differences in pretreatment I. cylindrica shoot height, with the exception of two panhandle populations that were shorter. Subsequent harvests indicated few differences in shoot and root plus rhizome weights among untreated controls for almost all populations, with the exception of one of the initially shorter panhandle populations. Our findings indicate that variability in glyphosate efficacy, as suggested by managers, is unlikely due to any conferred resistance. Other abiotic factors such as drought and shade and applicator factors such as carrier water quality should be examined to better understand this issue. Additional studies examining non-target impacts of aminocyclopyrachlor should be conducted to determine its potential fit into I. cylindrica management.

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“…Parker et al (2015) Flessner et al (2011a) found injury consistent with other synthetic auxin-type herbicides that included growth stimulation and vascular inhibition.…”

Section: Invasive Plant Science and Management 85supporting

confidence: 53%

“…Although aminocyclopyrachlor primarily controls many broadleaf weeds, certain grasses have also exhibited susceptibility to aminocyclopyrachlor. Parker et al (2015) found I. cylindrica was more susceptible to aminocyclopyrachlor than tall fescue [ Lolium arundinaceum (Schreb.) Darbysh.…”

Section: Resultsmentioning

confidence: 99%

Response of twelve Florida cogongrass (Imperata cylindrica) populations to herbicide treatment

Enloe

Lucardi

Loewenstein

et al. 2018

Invasive plant sci. manag.

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“…japonicus showed a high level of tolerance to mesotrione with no dry weight inhibition at 80 g a.i. ha –1 (data not shown), which may be caused by the different uptake, translocation, and metabolism of herbicides as well as target enzyme sensitivity to herbicides among different weed species. ,− …”

Section: Resultsmentioning

confidence: 99%

Cypyrafluone, a 4-Hydroxyphenylpyruvate Dioxygenase Inhibitor to Control Weed in Wheat Fields

Lian

Wang

Zhang

et al. 2023

J. Agric. Food Chem.

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As a bleaching herbicide, cypyrafluone was applied postemergence in wheat fields for annual weed control; especially, this herbicide possesses high efficacy against cool-season grass weed species such as Alopecurus aequalis and Alopecurus japonicus. In this study, the target of action of cypyrafluone on 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibition was confirmed. This herbicide caused severe foliar whitening symptoms at 5−7 days after treatment (DAT) and death of the whole plant within 10 DAT. Significant increases in phytoene content and significant decreases in kinds of carotenoid and chlorophyll pigments were observed. The content of chlorophyll pigments in cypyrafluone-treated Spirodela polyrhiza decreased upon the addition of homogentisic acid (HGA), which indicated that cypyrafluone prevents the HGA production, possibly by inhibiting the catalytic activity of 4-HPPD. Indeed, cypyrafluone strongly inhibited the catalytic activity of Arabidopsis thaliana HPPD produced by Escherichia coli, which was approximately 2 times less effective than mesotrione. In addition, overexpression of Oryza sativa HPPD in rice and A. thaliana both conferred a high tolerance level to cypyrafluone on them. Molecular docking found that cypyrafluone bonded well to the active site of the HPPD and formed a bidentate coordination interaction with the Fe 2+ atom, with distances of 2.6 and 2.7 Å between oxygen atoms and the Fe 2+ atom and a binding energy of −8.0 kcal mol −1 .

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“…Herbicide treatments were applied inside the growth chamber to prevent any outside conditions (wind, differing temperature and humidity) from affecting herbicide penetration and absorption and to restrict observed effects to those originating from environmental factors, limiting any confounding outside effects on target plant physiology and metabolic processes. The application strategy was similar to that used by Parker et al (2015) for absorption experiments. Herbicide treatments were made under separate growth chamber conditions to determine the effect of differing temperature, day/night temperature differential, and humidity on phytotoxicity and hydrogen peroxide formation.…”

Section: Plant Materials and Treatmentsmentioning

confidence: 99%

Investigation into interactions of environmental and application time effects on 2,4-D and dicamba-induced phytotoxicity and hydrogen peroxide formation

Johnston¹,

Vencill

Grey

et al. 2019

Weed Sci

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Application timing and environmental factors reportedly influence the efficacy of auxinic herbicides. In resistance-prone weed species such as Palmer amaranth (Amaranthus palmeri S. Watson), efficacy of auxinic herbicides recently adopted for use in resistant crops is of utmost importance to reduce selection pressure for herbicide-resistance traits. Growth chamber experiments were conducted comparing the interaction of different environmental effects with application time to determine the influence of these factors on visible phytotoxicity and hydrogen peroxide (H2O2) formation in A. palmeri. Temperature displayed a high degree of influence on 2,4-D and dicamba efficacy in general, with applications at the low-temperature treatment (31/20 C day/night) resulting in an increase in phytotoxicity compared with high-temperature treatments (41/30 C day/night). Application time across temperature treatments significantly affected 2,4-D–induced phytotoxicity, resulting in a ≥30% increase across rates with treatments at 4:00 PM compared with 8:00 AM. Temperature differential had a significant influence on dicamba efficacy based on visible phytotoxicity data, with a ≥46% increase with a high (37/20 C day/night) compared with a low differential (41/30 C day/night). Concentration of H2O2 in herbicide-treated plants was 34% higher under a high temperature differential compared with the low differential. Humidity treatments and application time interactions displayed undetected or inconsistent effects on visible phytotoxicity and H2O2 production. Overall, temperature-related influences seem to have the largest environmental effect on auxinic herbicides within conditions evaluated in this study. Leaf concentration of H2O2 appears to be generally correlated with phytotoxicity, providing a potentially useful tool in determining efficacy of auxinic herbicides in field settings.

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Physiological Basis for Differential Selectivity of Four Grass Species to Aminocyclopyrachlor

Cited by 3 publications

References 38 publications

Response of twelve Florida cogongrass (Imperata cylindrica) populations to herbicide treatment

Response of twelve Florida cogongrass (Imperata cylindrica) populations to herbicide treatment

Cypyrafluone, a 4-Hydroxyphenylpyruvate Dioxygenase Inhibitor to Control Weed in Wheat Fields

Investigation into interactions of environmental and application time effects on 2,4-D and dicamba-induced phytotoxicity and hydrogen peroxide formation

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