Some Selected References on Glyphosate
From: Don Huber, Prof. Emeritus of Purdue University.
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8. Benachour, N. Sipahutar, H., Moslemi, S., Gasnier, C., Travert, C., and Seralini, G.E. 2007. Time- and dose-dependent effects of roundup on human embryonic and placental cells. Arch. Environ. Contam. Toxicol. 53:126-133.
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9.a. Bernards, M.L. Thelen, K.D., Muthukumaran, R.J. and McCracker, J.L. 2005. Glyphosate interaction with manganese in tank mixtures and its effect on glyphosate absorption and translocation. Weed Sci. 53:787-794.
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11. Bott, S., Tesfamariam, T., Kania,, A. Eman, B., Aslan, N., Roemheld, V., and Neumann, G. 2011. Phytotoxicity of glyphosate soil residues re-mobilised by phosphate fertilization. Plant Soil 315:2-11. DOI 10, 1007/s11104-010-0689-3.
12. Boyette, C.D., Reddy, K.N., and Hoagland, R.E. 2006. Glyphosate and bioherbicide interaction for controlling kudzu (Pueraria lobata), and trumpet creeper (Campsis radicans). Biocontrol Sci. Tech. 16:1067-1077.
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14. Cakmak, I., Yazici, A., Tutus, Y., and Ozturk, L. 2009. Glyphosate reduced seed and leaf concentrations of calcium, magnesium, manganese, and iron in non-glyphosate resistant soybean. European J. Agron. 31:114-119.
15. Camberato, J., Wise, K., and Johnson, B. 2010. Glyphosate-manganese interactions and impacts on crop production: the controversy. Purdue Extension Weed Sci. 4/8/2010. http://www.btny.purdue.edu/weedscience.
16. Camberato, J., Casteel, S., Goldsbrough, P., Johnson, B., Wise, K., Woloshuk, C. 2011. Glyphosate’s impact on crop production and disease development. February 24, 2011. http://www.btny.purdue.edu/weedscience/
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22. Dodds, D.M., Hickman, M.V., and Huber, D.M. 2002. Comparison of micronutrient uptake by glyphosate resistant and non-resistant soybeans. Proc. North Central Weed Sci. Soc. 56:96.
23. Dodds, D.M., Hickman, M.V., and Huber, D.M. 2002, Micronutrient uptake by isogenic glyphosate tolerant and normal corn. Proc. Weed Sci. Soc. Amer. 42:2.
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33. Gabrielle, M.L. and Barriuso, E. 2008. Measurement and modeling of glyphosate fate compared with that of herbicides replaced as a result of the introduction of glyphosate-resistant oilseed rape. Pest Manage. Sci. 64:262-275.
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35. Gasnier, C., Dumont, C., Benachour, N., Clair,E., Chagnon, M-C., and Seralini, G-E. 2009. Glyphosate-based herbicides are toxic and endocrine disruptors in human cell lines. Toxicology 262:184-191.
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ZOBIOLE, L.H.S.; OLIVEIRA JR., R.S.; CONSTANTIN, J. and BIFFE, D.F. 2011. Prevention of RR soybean injuries caused by exogenous supply of aminoacids. Planta daninha [online]. 2011, vol.29, n.1, pp. 195-205. ISSN 0100-8358.
Glyphosate-resistant (RR) soybean crop areas have expanded every year. However, as a result of this expansion, the use of glyphosate has significantly increased, with the appearance of visual injuries in RR soybeans immediately after post-emergence application of the herbicide. Thus, two experiments were conducted in different years with different objectives. The first experiment aimed to evaluate the influence of glyphosate on photosynthetic variables and biomass production. The second experiment aimed to re-evaluate the same parameters affected in RR soybeans by glyphosate, as well as the use of various methods of amino acid application, as a form of a likely recovery of the soybean plants following these exogenous applications. The photosynthetic rate and SPAD index decreased as the glyphosate rate increased, with a pronounced decrease after a single herbicide application. Overall, due to a decrease in the photosynthetic rate and chlorophyll production, as well as to a likely immobilization of shoot nutrient concentration by glyphosate, a significant biomass decrease was verified in the treatments with glyphosate application. However, the use of exogenous amino acids may be a strategy to safeguard the undesirable effects of this herbicide on RR soybean.
Keywords : photosynthesis; herbicide; chlorosis; Rhizobium.
version ISSN 0100-8358
ZOBIOLE, L.H.S. et al. Use of exogenous amino acid to prevent glyphosate injury in glyphosate-resistant soybean. Planta daninha [online]. 2010, vol.28, n.3, pp. 643-653. ISSN 0100-8358. doi: 10.1590/S0100-83582010000300022.
Cultivation of glyphosate-resistant (GR) soybeans has increased in Brazil as a result of the application of this technology in weed management systems developed for this crop. However, the expansion of GR soybean production has significantly increased the use of glyphosate and, in some cases, resulted in injury symptoms observed in GR soybean, known as “yellow flashing” or yellowing of the upper leaves. Thus, two experiments were conducted in different years. The first experiment aimed to evaluate the influence of glyphosate on GR soybeans regarding the photosynthetic variables, nodule parameters, and shoot and root dry biomass by comparing cultivar BRS 242 GR without glyphosate and BRS 242 RR + glyphosate at 1.200 g ha-1 at V4 growth stage, to the near isogenic non-GR parental line cv. Embrapa 58. The second experiment aimed to reassess the same parameters in GR soybeans at the V4 stage treated with glyphosate, plus the application of various amino acids, to evaluate the expected recovery of soybean growth under the exogenous use of supplemental amino acids. In general, the photosynthetic variables, nodulation parameters and shoot and root dry biomass were affected by glyphosate; however, the use of amino acids may be a strategy to prevent the undesirable effects of this herbicide on GR soybean