Influence of Crop Safeners on the Interaction of Primisulfuron and Terbufos in Corn (<i>Zea mays</i>)

Frazier, Todd L.; Nissen, Scott J.

doi:10.1017/s004317450008022x

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…Corn injury from the interaction of organophosphate insecticides with sulfonylurea herbicides has been attributed to reduced herbicide metabolism in insecticide-treated plants [ 24 , 25 ]. The use of herbicide safeners to compensate for reduced sulfonylurea herbicide metabolism in insecticide-treated plants is of interest because several safeners have increased the metabolism of sulfonylurea herbicides [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Physiological basis for isoxadifen-ethyl induction of nicosulfuron detoxification in maize hybrids

Sun

et al. 2017

PLoS ONE

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Isoxadifen-ethyl can effectively alleviate nicosulfuron injury in the maize. However, the effects of safener isoxadifen-ethyl on detoxifying enzymes in maize is unknown. The individual and combined effects of the sulfonylurea herbicide nicosulfuron and the safener isoxadifen-ethyl on the growth and selected physiological processes of maize were evaluated. Bioassays showed that the EC50 values of nicosulfuron and nicosulfuron plus isoxadifen-ethyl for maize cultivar Zhengdan958 were 18.87 and 249.28 mg kg-1, respectively, and were 24.8 and 275.51 mg kg-1, respectively, for Zhenghuangnuo No. 2 cultivar. Evaluations of the target enzyme of acetolactate synthase showed that the I50 values of nicosulfuron and nicosulfuron plus isoxadifen-ethyl for the ALS of Zhengdan958 were 15.46 and 28.56 μmol L-1, respectively, and were 0.57 and 2.17 μmol L-1, respectively, for the acetolactate synthase of Zhenghuangnuo No. 2. The safener isoxadifen-ethyl significantly enhanced tolerance of maize to nicosulfuron. The enhanced tolerance of maize to nicosulfuron in the presence of the safener, coupled with the enhanced injury observed in the presence of piperonyl butoxide, 1-aminobenzotriazole, and malathion, suggested cytochrome P450 monooxygenases may be involved in metabolism of nicosulfuron. We proposed that isoxadifen-ethyl increases plant metabolism of nicosulfuron through non-P450-catalyzed routes or through P450 monooxygenases not inhibited by piperonyl butoxide, 1-aminobenzotriazole, and malathion. Isoxadifen-ethyl, at a rate of 33 mg kg-1, completely reversed the effects of all doses (37.5–300 mg kg-1) of nicosulfuron on both of the maize cultivars. When the two compounds were given simultaneously, isoxadifen-ethyl enhanced activity of glutathione S-transferases (GSTs) and acetolactate synthase activity in maize. The free acid 4,5-dihydro-5,5-diphenyl-1,2-oxazole-3-carboxylic was equally effective at inducing GSTs as the parent ester and appeared to be the active safener. GST induction in the maize Zhenghuangnuo No. 2 was faster than in Zhengdan 958.

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Section: Introductionmentioning

confidence: 99%

Physiological basis for isoxadifen-ethyl induction of nicosulfuron detoxification in maize hybrids

Sun

et al. 2017

PLoS ONE

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“…Robinson et al (1996) reported that the safener LAB 145 138 (1-dichloroacetylhexahydro-3,3,8-␣-trimethylpyrrolo-(1,2-␣)-pyrimidin-6-(2H)one) applied as a seed treatment or POST at the two-to three-, four-to five-, or six-to seven-leaf growth stages protected sweet corn from the nicosulfuron-terbufos interaction when nicosulfuron was applied at the six-to seven-leaf growth stage. Frazier and Nissen (1994) determined that the safener MON-13900 increased metabolism of primisulfuron in terbufos-treated corn. Even though safeners have been reported to increase corn tolerance from sulfonylurea herbicides, currently foramsulfuron is the only commercially available POST corn herbicide formulated with a safener (Anonymous 2003b).…”

Section: Introductionmentioning

confidence: 99%

Corn Tolerance as Affected by the Timing of Foramsulfuron Applications

2004

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Two corn hybrids were evaluated to determine tolerance to foramsulfuron applications with and without the safener, isoxadifen-ethyl at five application timings. The corn hybrid N58D1 was more sensitive to foramsulfuron applications than N59Q9. Averaged across all application timings, the addition of isoxadifen-ethyl decreased corn injury of the more sensitive corn hybrid, N58D1. Foramsulfuron application timing had a significant effect on corn tolerance. The greatest corn injury generally occurred from foramsulfuron applications to V6 and V8 corn (visible collars). Foramsulfuron injury ranged between 9 and 37% from these two application timings, 7 d after treatment (DAT). By 21 DAT, corn generally recovered from foramsulfuron injury, and there were a few cases of reduced corn yield at the end of the season. Yield reductions and ear malformations were greatest at the Urbana location with both hybrids when foramsulfuron was applied to V12 corn. The addition of isoxadifen-ethyl alleviated ear malformations and increased corn yield from this application timing. Applications of foramsulfuron before V6 corn also were important in reducing corn injury and protecting yield. Therefore, when growers are using foramsulfuron for weed control, it will be important to select proper hybrids that are more tolerant as well as making applications before V6 corn.

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“…Robinson et al (1996) reported that the safener LAB 145 138 applied as a seed treatment or postemergence at the two-to three-, fourto five-, or six-to seven-leaf growth stages protected sweet corn from the nicosulfuron-terbufos interaction when nicosulfuron was applied at the six-to seven-leaf growth stage. Frazier and Nissen (1994) determined that the safener MON-13900 increased metabolism of primisulfuron that was inhibited in terbufos-treated corn. Even though safeners have been reported to increase corn tolerance from sulfonylurea herbicides, currently foramsulfuron is the only commercially available postemergence corn herbicide formulated with a safener (Anonymous 2003).…”

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confidence: 99%

Physiological basis for tolerance of corn hybrids to foramsulfuron

2004

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Foramsulfuron (AE F130360) is a sulfonylurea herbicide for postemergence control of grasses and some broadleaf weeds in corn. Greenhouse and laboratory experiments were conducted to determine the physiological basis for differential tolerance of corn hybrids to foramsulfuron. Differences in corn tolerance were quantified by determining the herbicide rate required to cause injury and reduce corn height by 15% (GR15). Seven hybrids were screened in the greenhouse where GR15 values indicated that the some of the corn hybrids were sensitive to foramsulfuron. All but one of these hybrids exhibited an increase in tolerance when the safener, isoxadifen-ethyl, was applied with foramsulfuron. Experiments using 14C-foramsulfuron were conducted to determine whether isoxadifen-ethyl affected foramsulfuron absorption, translocation, and metabolism in two of the corn hybrids. There was no difference in absorption between a sensitive hybrid Novartis 58D1 and a more tolerant hybrid Novartis 59Q9, but the addition of isoxadifen-ethyl increased foramsulfuron absorption in both hybrids 24 h after treatment. Less than 1 and 3% of the 14C-foramsulfuron was translocated to plant portions above and below the treated leaf, respectively. Differences in hybrid tolerance were primarily due to differential herbicide metabolism. Foramsulfuron metabolism, with and without isoxadifen-ethyl, was similar at 4 h after treatment for both the sensitive and tolerant hybrids. However, by 24 h after treatment the more tolerant hybrid metabolized foramsulfuron to more polar compounds to a greater degree than the sensitive hybrid.

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Influence of Crop Safeners on the Interaction of Primisulfuron and Terbufos in Corn (Zea mays)

Cited by 8 publications

References 16 publications

Physiological basis for isoxadifen-ethyl induction of nicosulfuron detoxification in maize hybrids

Physiological basis for isoxadifen-ethyl induction of nicosulfuron detoxification in maize hybrids

Corn Tolerance as Affected by the Timing of Foramsulfuron Applications

Physiological basis for tolerance of corn hybrids to foramsulfuron

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