Hormetic effect of glyphosate on <i>Urochloa decumbens</i> plants

Moraes, Carolina Nogueira de; Brito, Ivana Paula Ferraz Santos de; Tropaldi, Leandro; Carbonari, Caio Antônio; Velini, Edivaldo Domingues

doi:10.1080/03601234.2019.1705114

Cited by 26 publications

(17 citation statements)

References 17 publications

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“…ha −1 glyphosate. Similarly, Moraes et al 13 reported increases of 30% and 24% in DMM of the aerial part of Urochloa decumbens compared with control, in two experiments, with the stimulus being promoted by a low dose of 11.25 g a.e. ha −1 .…”

Section: Discussionmentioning

confidence: 68%

“…[4][5][6] The stimulatory effect of treatment with low doses of chemicals on the growth of various plant species has been the focus of several studies. [5][6][7][8][9][10][11][12][13][14] In this context, the term hormesis refers to an adaptive/protective response caused by chemical stressors when used in low doses in plants. 15 The most widely used herbicide in the world, glyphosate, causes hormesis, 1,3,9,16,17 and studies are ongoing to elucidate the ability of low doses of glyphosate to stimulate plant growth 13 and improve agricultural sustainability by reducing environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

“…Although our research group has provided information on the stimulating effect of low doses of glyphosate on Commelia benghalensis, Eucalyptus grandis, maize, Pinus caribea, soybean, 5 sugarcane, [6][7][8] Urochloa decumbens, 9,13 sugarcane, eucalyptus, 11 and Phaseolus vulgaris, 14 deeper knowledge of glyphosate-caused hormesis on C. tinctorius under water deficiency conditions is needed, because water deficit is the most unpredictable abiotic stress in terms of occurrence, severity, distribution and duration. 30 Studies on the interaction between water deficit and glyphosate hormesis in plants are rare; however, previous studies with Phaseolus vulgaris have shown a greater tolerance to water stress in the presence of low doses of glyphosate.…”

Section: Introductionmentioning

confidence: 99%

“…The stimulatory effect of treatment with low doses of chemicals on the growth of various plant species has been the focus of several studies 5‐14 . In this context, the term hormesis refers to an adaptive/protective response caused by chemical stressors when used in low doses in plants 15 .…”

Section: Introductionmentioning

confidence: 99%

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Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

Santos

Silva

Amorim

et al. 2021

Pest Management Science

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BACKGROUND The current climate change scenario may affect water availability in the soil, impacting the agricultural sector. Planting of safflower (Carthamus tinctorius L.) has increased because of its potential for cultivation under drought conditions during the off‐season in Brazil and its high potential for use in biofuel production. There are several reports about the potential of low doses of glyphosate to promote plant growth and development (hormesis). Despite the concept of glyphosate hormesis being well established, little is known about any mitigating effect on plants under water deficit conditions. The hypothesis raised is that low doses of glyphosate promote water stress tolerance during the growth and reproductive phases of C. tinctorius exposed to different water regimes. RESULTS In regimes with and without water deficiency, growth of plants treated with low doses of glyphosate increased, reaching a maximum stimulus amplitude of ~ 131% of control. However, plants under water deficit required lower doses to achieve maximum growth and development. They maintained photosynthetic rates at the level of well‐watered plants because they had reduced stomatal conductance and transpiration. Gains in plant height and leaf area were the same as for controls. CONCLUSIONS Low doses of glyphosate can act as mitigators of water deficit in C. tinctorius, allowing plants to maintain their metabolism, reaching levels close to those of plants without water stress, as observed for plant height and leaf area. Our findings indicate that there are even greater implications for understanding glyphosate hormesis in plants under drought conditions, given the current climate change scenario. © 2020 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

Santos

Silva

Amorim

et al. 2021

Pest Management Science

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“…Frequent and inevitable foliar exposure of weeds to sublethal doses of herbicides could have a great impact on weed populations (Belz and Duke 2014;De Moraes et al 2020;Saunders and Pezeshki 2015). Silva et al (2016) showed that soybeans treated with sublethal doses of glyphosate had differential hormetic responses to further glyphosate exposure.…”

Section: Buds and Seed Productionmentioning

confidence: 99%

Glyphosate-induced hormesis: impact on seedling growth and reproductive potential of common sowthistle (Sonchus oleraceus)

2020

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In Australia, glyphosate is widely used in glyphosate-tolerant crops and fallows to control weeds such as common sowthistle (Sonchus oleraceus L.). It has been hypothesized that glyphosate at sub-lethal doses, as a consequence of herbicide drift, may have a stimulatory effect on S. oleraceus growth. In 2017, pot trials were conducted to evaluate the effect of low doses of glyphosate on growth and seed production of this weed at the Weed Science Screenhouse Facility at the University of Queensland, Australia. At the 4-5 leaf stage (three-week-old rosette), plants were treated with low doses of glyphosate (0 (control), 5, 10, 20, 40, 80 and 800 g ae ha-1; g ha-1 hereafter), and their responses were recorded until plant maturity. The study was repeated after completion of the first experimental run. An additional glyphosate dose (2.5 g ha-1) was added to study in the second run. The low doses of glyphosate (< 40 g ha-1) caused a significant increase in S. oleraceus plant height and number of leaves compared to the no-glyphosate treatment. The highest stimulatory effect was observed at 5 g ha-1. At 5 g ha-1 glyphosate, S. oleraceus seed production increased by 154% and 101% in the first and second experimental run, respectively, compared to the no-glyphosate treatment. The results of this study suggest that the sub-lethal doses of glyphosate caused hormetic effects on growth and seed production of S. oleraceus that may change the dynamics of weed-crop competition.

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Effect of low glyphosate doses on flowering and seed germination of glyphosate‐resistant and ‐susceptible Digitaria insularis

Anunciato

Bianchi

Gomes

et al. 2021

Pest Management Science

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BACKGROUND: Herbicide hormesis is characterized by stimulation of various growth and developmental parameters, such as biomass and height, at low herbicide doses. Other possible hormetic effects are earlier flowering, higher seed weight, more seeds, and a shorter plant life cycle, which could favor the propagation of the species. This study tested the early flowering in glyphosate-resistant and -susceptible Digitaria insularis biotypes under treatment with low glyphosate doses. RESULTS: Hormesis caused by low glyphosate doses occurred in all experiments. The hormetic effects were a decrease in time necessary for the formation of inflorescences and increased seed weight and germination speed. Higher glyphosate doses were required for the hormetic effect in the glyphosate-resistant than the -susceptible D. insularis biotype. CONCLUSIONS: Hormesis caused by low glyphosate doses in D. insularis may provide an advantage for the dissemination of this species, helping to alter the weed flora. As the doses that cause stimulation in glyphosate-resistant biotypes are higher than in glyphosate-susceptible biotypes, the selection of resistant biotypes may be favored in glyphosate-sprayed fields, increasing the rate of infestation of glyphosate-resistant biotypes.

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Hormetic effect of glyphosate on Urochloa decumbens plants

Cited by 26 publications

References 17 publications

Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

Glyphosate-induced hormesis: impact on seedling growth and reproductive potential of common sowthistle (Sonchus oleraceus)

Effect of low glyphosate doses on flowering and seed germination of glyphosate‐resistant and ‐susceptible Digitaria insularis

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