Use of dicamba-degrading microorganisms to protect dicamba susceptible plant species

Krueger, James P.; Butz, Robert G.; Cork, Douglas J.

doi:10.1021/jf00005a040

Cited by 30 publications

(21 citation statements)

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“…Similarly, Krueger et al (1991) have shown protection of soybean and pea seedling from the deleterious effects of the herbicide, dicamba by inoculating soils with dicamba-degrading bacteria. However, unlike in the present study, in both the above two cases, the germination of seeds occurred normally, irrespective of the time of sowing.…”

Section: Effect Of 245-t On Seed Germinationmentioning

confidence: 99%

“…Cereals planted the year after the application of simazine (2-chloro-4,6-bis-(ethylamino)-s-triazine) and atrazine (2-chloro-4-(ethylamino)-6-isopropylamino-s-triazine) were reported to be severely injured (Splittsoesser and Derscheid, 1962). Seedlings of peas and soybean have been shown to be susceptible to even low levels of the herbicide dicamba (3,6-dichloro-2-methoxybenzoic acid) (Krueger et al, 1991). 2,4-Dichlorophenoxyacetic acid (2,4-D), a commonly used herbicide, was shown to cause dormancy in seeds of agricultural crops and malformation of root tips of seedlings (Moreland, 1967).…”

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confidence: 99%

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Protection of Tomato Seed Germination from the Inhibitory Effect of 2,4,5-Trichlorophenoxyacetic Acid by Inoculation of Soil with Burkholderia cepacia AC1100

Gangadhara

Kunhi

2000

J. Agric. Food Chem.

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The effect of 2,4,5-trichlorophenoxy acetic acid (2,4,5-T) on the germination and seedling vigor of different crop seeds was tested. Seeds of rice, maize, sorghum, finger millet, and horse gram were comparatively more tolerant to the chemical with no marked effect up to a concentration of 200 mg 2,4,5-T L(-)(1) as tested by the filter paper method. Tomato and brinjal (egg plant) were highly susceptible. Even at 5 and 10 mg 2,4,5-T L(-)(1), marked reduction in the germination and seedling vigor of tomato and egg plant, respectively, was observed. At 20 and 30 mg L(-)(1), the germination of tomato and egg plant seeds, respectively, were completely inhibited on filter paper, whereas the inhibitory concentrations in soil was 40 mg 2,4,5-T kg(-)(1) soil. Several abnormalities were observed in the chemically affected seedlings. Protease activity of the seeds germinating in the presence of the chemical was drastically reduced. Bioremediation of the chemically contaminated soil with Burkholderia cepacia AC1100, by inoculation of the soil 7 days before sowing the seeds, completely protected the seeds, resulting in normal germination and an improved seedling vigor.

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Section: Effect Of 245-t On Seed Germinationmentioning

confidence: 99%

mentioning

confidence: 99%

Protection of Tomato Seed Germination from the Inhibitory Effect of 2,4,5-Trichlorophenoxyacetic Acid by Inoculation of Soil with Burkholderia cepacia AC1100

Gangadhara

Kunhi

2000

J. Agric. Food Chem.

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“…Pseudomonas spp.) capable of degrading soil-applied herbicides are currently evaluated as potential microbial safeners (Krueger et al, 1991). Safeners are desirable because they a) allow the selective control of weeds in botanicallyrelated crops; b) expand the uses of currently-available herbicides; and c) improve the selectivity of newly developed herbicides.…”

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confidence: 99%

Herbicide safeners: Tools for improving the efficacy and selectivity of herbicides

Hatzios

1996

Journal of Environmental Science and Health, Part B

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Safeners (also known as antidotes) are chemical or biological agents that reduce the toxicity of herbicides to crop plants by a physiological or molecular mechanism. Commercialized safeners are mainly chemical compounds that enhance the tolerance of selected grass crops such as maize (Zea mays L.), grain sorghum [Sorghum bicolor (L.) Moench], rice (Oryza sativa L.), and wheat (Triticum aestivum L.)to chloroacetanilide, thiocarbamate, sulfonylurea, imidazolinone, and aryloxyphenoxypropionate herbicides. In practice, safeners are applied either to the crop prior to planting (seed safeners) or to the soil together with the herbicide, formulated as a prepackaged mixture. Safeners act as "bioregulators" controlling the amount of a given herbicide that reaches its target site in an active form. A safenerinduced enhancement of the metabolic detoxification of herbicides in protected plants is the most apparent mechanism for the action of all commercialized safeners.Herbicide-detoxifying enzymes such as glutathione transferases (GST), cytochrome P-450 monooxygenases (CytP450), esterases, and UDP-glucosyltransferases are induced by herbicide safeners. At the molecular level, safeners appear to act by activating or amplifying genes coding for these enzymes (e.g., GST).

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“…These same chemicals may have utility in developing phytoremediation as a practical technology for remediation of herbicide-contaminated soils that will allow the use of traditional crops for phytoremediation. Furthermore, bacteria that degrade the herbicide dicamba (3,6-dichloro-2-methoxybenzoic acid) have been used in soils to protect susceptible crop species from herbicide toxicity (24). Detoxification has been proposed as a potential mode of action of plant-growth-promoting rhizobacteria (25).…”

Section: Discussionmentioning

confidence: 99%

An Integrated Phytoremediation Strategy for Chloroacetamide Herbicides in Soil

Hoagland¹,

Zablotowicz²,

Locke³

1997

Phytoremediation of Soil and Water Contaminants

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We have tested an integrated system for phytoremediation using corn (Zea mays L.), a safener specific for chloroacetamides (benoxacor), and an inoculum of a rhizosphere-competent Pseudomonas fluorescens strain UA5-40rif capable of catabolizing these herbicides. Initial growth chamber studies with a Bosket sandy loam soil (organic matter content < 1%), benoxacor (0.75 kg ha -1 ) and inocula of this bacterium provided protection to corn seedlings at herbicide application rates of up to 45 and 54 kg ha -1 of alachlor and metolachlor, respectively. Satisfactory root colonization, i.e. log (10) 6.2 to 7.4 cfu g -1 root by UA5-40rif, was observed at concentrations up to 12x of these herbicide rates. Following 12 days of plant growth, alachlor concentrations in soil from safened and inoculated corn seedlings were about 25% and 35 % of those observed in unplanted soil at the 12x alachlor and metolachlor rate, respectively. Additional experiments studied applications of up to 36x of formulated metolachlor. At this higher metolachlor rate, normal physiological development was observed in benoxacor-safened seedlings, although there were slight reductions in root and shoot biomass. Metolachlor residues in soil treated with the 36x rate were 89%, 80%, 75%, respectively, for the unplanted soil, corn, and corn + benoxacor treatments, while only 54% remained in corn + benoxacor + UA5-40 treatment. Results indicate that use of a combination of chemical and biological safeners (competent herbicide-detoxifying rhizobacteria) is a novel and useful approach for increasing herbicide tolerance in an agronomic crop plant for enhanced phytoremediation.Contamination of some soils with herbicides has become a serious environmental problem. The chloroacetamide herbicides, especially alachlor [2-chloro-iV-(2,6-diethylphenyl)-iV-(methoxymethyl) acetamide] and metolachlor [2-chloro-^-(2-ethyl-6-methylphenyl)-^-(2-methoxy-1 -methylethyl) acetamide] are common contaminants in agricultural chemical 92This chapter not subject to U.S.

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Use of dicamba-degrading microorganisms to protect dicamba susceptible plant species

Cited by 30 publications

References 10 publications

Protection of Tomato Seed Germination from the Inhibitory Effect of 2,4,5-Trichlorophenoxyacetic Acid by Inoculation of Soil with Burkholderia cepacia AC1100

Protection of Tomato Seed Germination from the Inhibitory Effect of 2,4,5-Trichlorophenoxyacetic Acid by Inoculation of Soil with Burkholderia cepacia AC1100

Herbicide safeners: Tools for improving the efficacy and selectivity of herbicides

An Integrated Phytoremediation Strategy for Chloroacetamide Herbicides in Soil

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