Sub-lethal doses of herbicides can promote plant growth and have a positive effect on an organism this is called hormesis. The purpose of this study was to test the effects of sub-lethal doses of glyphosate on soybean (Glycine max (L.) Merr.) (1.8, 3.6, 7.2, 36, 180, and 720 g ha-1) and Amaranthus retroflexus L. (7.2, 36, 180, 720, 1440, and 2880 g ha-1). Different biological parameters, such as phytotoxicity, fresh weight, root length, content of photosynthetic pigments, and shikimate concentration, were measured. Glyphosate in doses of 1440 and 2880 g ha-1 destroyed A. retroflexus plants. A fresh weight of A. retroflexus at a dose of 36 g ha-1 was reduced by 76.31%, while for the soybean it was reduced by 19.26%. At the highest dose, the shikimate concentration was 145% in the soybean, while in A. retroflexus, the concentration increased by 58.80% compared to the control plants. All doses of glyphosate were statistically significantly different in terms of chlorophyll a content, while higher doses in A. retroflexus caused chlorophyll b to decrease. The change in the production of carotenoids was not statistically significant. The results showed that sub-lethal amounts of glyphosate did not lead to stimulation of measured parameters of soybean.
CITATION STYLE
Meseldžija, M., Lazić, S., Dudić, M., Šunjka, D., Rajković, M., Marković, T., … Ivanović, I. (2020). Is there a possibility to involve the hormesis effect on the soybean with glyphosate sub-lethal amounts used to control weed species Amaranthus retroflexus L.? Agronomy, 10(6). https://doi.org/10.3390/agronomy10060850
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