Interactions of the herbicides EPTC and EPTC + R-25788 with ozone and antioxidants in corn

Hatzios, Kriton K.

doi:10.1021/jf00120a012

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…Later, piperonyl butoxide and SKF 525A injected into the stem of maize seedlings were found to increase the toxicity of EPTC (Komives & Dutka, 1980). Similar results were obtained with preplant application of high piperonyl butoxide doses (Hatzios, 1983).…”

Section: Introductionsupporting

confidence: 84%

“…It is worth ting that triazole plant growth regulators 'lich act on cytochrome P-450 inhibitors, were I) antagonists of EPTC (Ekler & Stephenson, 1^87). However, in some earlier studies, insect cytochrome P-450 monooxygenase inhibitors, such as pip>eronyl butoxide, were synergistic (Komives & Dutka, 1980;Hatzios, 1983) or without effect (Taft, 1976) on this herbicide. Possible explanations of these conflicting results are that the mode of application of inhibitors varied in these discussed experiments or that the sensitivities of maize enzymes or isozymes to the chemicals varied.…”

Section: Discussiodmentioning

confidence: 85%

“…Suggestions for the effect of sulfoxidation on EPTC toxicity are also contradictory and vary from bioactivation (Casida, 1982) to no effect (Taft, 1976) and detoxication (Komives & Dutka, 1980;Hatzios, 1983). Moreover, according to recent hypotheses, mono-oxygenases are also involved in the mode of action of herbicide safeners (Fedtke, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Influence of 1‐aminobenzotriazole (ABT) derivatives on the toxicity of EPTC to monocotyledonous plants

Barta

Dutka

1991

Weed Research

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Summary: The effect of l‐aminobenzotriazole (ABT) and EPTC mixtures on plant growth was investigated in greenhouse experiments by presowing application in sand. The concentration of ABT for 50% shoot growth inhibition (I50) was about 1 mM in the monoctyledons investigated. Both subtoxic and toxic doses of ABT were antagonists of EPTC in maize (Zea mays L.) However, subtoxic doses of ABT were syner‐gists of EPTC in wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and oat (Avena sativa L.). No correlation between ABT and EPTC sensitivity of monocotyledonous plants was found. Some of the C‐ and N‐substituted ABT derivatives (e.g. N‐methyl or N‐benzyl‐ABT) completely reversed the effect of toxic dose of EPTC in maize. These results are considered as indirect evidence for the hypothesis that oxidation by cytochrome P‐450 enzymes is the biochemical target of EPTC and is involved in the mode of action of EPTC safeners.

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Section: Introductionsupporting

confidence: 84%

Section: Discussiodmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Influence of 1‐aminobenzotriazole (ABT) derivatives on the toxicity of EPTC to monocotyledonous plants

Barta

Dutka

1991

Weed Research

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“…Whereas earlier experimental results and ideas did not support related modes of action for the different safeners known, more recent data has opened the possibility for a unifying concept (Fedtke, 1985). This concept begins with the observation of synergistic interactions between the insecticide synergist and mono-oxygenase inhibitor PBO and the herbicides metolachlor (Hatzios, 1983c) and EPTC (Hatzios, 1983b), both with and without safeners. Conversely, several herbicide safeners, and also the herbicide metolachlor, can act as insecticide synergists (Ketchersid, Plapp & Merkle, 1985), suggesting that these safeners and herbicides can act as mono-oxygenase inhibitors in insects.…”

Section: Safener Relationshipsmentioning

confidence: 99%

Physiological activity spectra of existing graminicides and the new herbicide 2‐(2‐benzothiazolyl‐oxy)‐N‐methyl‐N‐phenylacetamide (mefenacet)

Fedtke

1987

Weed Research

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Summary inhibitory activities of existing graminicides on root regeneration from monocotyledonous (oat) and dicotyledonous (soybean) plant cuttings in the light, in the dark and on algal growth were compared with the respective inhibitory activities of the new herbicide 2‐(2‐benzothiazo‐lyl‐oxy)‐N‐methyl‐N‐phenylacetamide (mefenacet). The mefenacet activity spectrum resembled that of the α‐chloroacetamide herbicides. Herbicide groups of other structure‐activity can be distinguished by their distinct activity spectrum. The mono‐oxygenase inhibitors piperonyl but‐oxide (PBO) and 1‐aminobenzotriazole (ABT) were found to antagonize the inhibitory activities of herbicides from the thiolcarbamate, α‐chloroacetamide, and oxyacetic acid amide structure groups in the oat rooting and leaf growth tests. The critical evaluation of the presently available information on graminicide and safener mode of action suggests the concept that lipid biosynthesis on the physiological level and mono‐oxygenase type enzymes on the biochemical level may hold the target sites for many of the graminicides and safeners discussed.

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“…Ozone may interact with herbicides on certain crop plants, thereby modifying either the plant response to herbicides (1, 2,3,4,14) or the metabolism of herbi cides in fumigated plants (7,8,9,10). For example, pebulate (5-propyl butylethylcarbamothioate) and chloramben (3-amino-2,5-dichlorobenzoic acid) can in teract synergistically with O3 on selected cultivars of tobacco (Nicotiana tabacum L.) (1).…”

Section: Introductionmentioning

confidence: 99%

Ozone-Metolachlor Interactions on Corn (Zea mays), Bean (Phaseolus vulgaris), and Soybean (Glycine max)

1989

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The potential interactive effects between metolachlor [0, 0.1, 0.5, and 1.0 ppm (w/w)] and the air pollutant ozone (O3) [0.2 and 0.4 ppm (v/v)], on growth of corn, bean, and soybean were examined under controlled conditions. At both concentrations, O3alone reduced corn and bean dry weights but only affected bean at 0.4 ppm (v/v). Shoot dry weight of corn was reduced by O3plus metolachlor more than expected, thus indicating synergism. The expected dry weights of bean and soybean treated with metolachlor plus O3were similar to or higher than expected, thus indicating additive or antagonistic interactions.

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Interactions of the herbicides EPTC and EPTC + R-25788 with ozone and antioxidants in corn

Cited by 9 publications

References 20 publications

Influence of 1‐aminobenzotriazole (ABT) derivatives on the toxicity of EPTC to monocotyledonous plants

Influence of 1‐aminobenzotriazole (ABT) derivatives on the toxicity of EPTC to monocotyledonous plants

Physiological activity spectra of existing graminicides and the new herbicide 2‐(2‐benzothiazolyl‐oxy)‐N‐methyl‐N‐phenylacetamide (mefenacet)

Ozone-Metolachlor Interactions on Corn (Zea mays), Bean (Phaseolus vulgaris), and Soybean (Glycine max)

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