Induced Hormesis in Plants with Herbicide Underdoses

Mielke, Kamila Cabral; Brochado, Maura Gabriela da Silva; Paula, Dilma Francisca de; Mendes, Kássio Ferreira

doi:10.1007/978-3-031-01938-8_6

Cited by 3 publications

(3 citation statements)

References 65 publications

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“…Neste caso, é evidente que estímulo hormese contumaz não acarreta benefícios produtivos, por estresse contínuo à planta. Perturbação constante interfere significativamente nos mecanismos biológicos que asseguram os processos adaptativos compensatórios de restabelecimento das funções celular e fisiológica dos tecidos da planta, que caracterizam a homeostase adaptativa (32)(33) . A desfolha, seguida de estresse hormético, resulta em exaustão energético e oxidativo por perturbação da toxina à planta.…”

Section: Resultsunclassified

Hormese induzida por glifosato em cultivares de Urochloa com aplicação sequencial

Codognoto,

Faria,

Maltoni

et al. 2023

Ciênc. anim. bras.

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Resumo Após a aplicação do herbicida glifosato para controle de plantas daninhas em cultivo agrícola, constata-se que a deriva do produto pode estimular crescimento e/ou rendimento produtivo em plantas não-alvo, localizadas nas adjacências do tratamento, caracterizando efeito hormese. Entretanto, os efeitos horméticos por glifosato podem ser diferentes para uma determinada espécie vegetal, o que depende da dose e do estágio de desenvolvimento da planta. Pressupondo estímulo de produção de biomassa de forragem para alimentação animal, o trabalho teve por objetivo avaliar o efeito hormese por aplicações sucessivas de subdose de glifosato em cultivares do gênero Urochloa. Foram avaliadas as respostas produtivas aérea e radicular em três cultivares de gramíneas (Urochloa brizantha cv. Marandu, U. brizantha cv. Piatã e U. ruziziensis cv. Ruziziensis) por aplicação foliar das subdoses do equivalente ácido (e.a.) de glifosato (5,40; 10,80; 21,60; 43,20; e, 86,40 g e.a. ha-1) e controle. Foram avaliadas quatro colheitas sequenciais, realizadas com frequência de 21 dias, em esquema fatorial 6 x 3 x 4, com três repetições, em delineamento inteiramente casualizado. Dose igual e superior a 43,2 g e.a. ha-1 de glifosato, em duas aplicações sequenciais, prejudicaram a produção de biomassa das forrageiras avaliadas. Dentre os cultivares, Ruziziensis foi mais susceptível ao efeito fitotóxico. Aplicações sequenciais das subdoses 5,40 e 10,80 g e.a. ha-1 de glifosato, caracterizaram efeito hormético, promovendo a produção de biomassa aérea e radicular das forrageiras Marandu, Piatã e Ruziziensis.

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Section: Resultsunclassified

Hormese induzida por glifosato em cultivares de Urochloa com aplicação sequencial

Codognoto,

Faria,

Maltoni

et al. 2023

Ciênc. anim. bras.

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“…Furthermore, DEP- 5 has a significantly higher lipophilicity ( c log P : 6.31) compared to the commercial herbicide BS ( c log P : 2.10) . Although DEP- 5′ s enzyme inhibitory activity is only at the micromolar level, its high lipophilicity likely enhances its uptake and translocation within plants, contributing to its superior weed control efficacy. Collectively, the novel chemical structure of DEP- 5 , along with its ease of synthesis, exceptional herbicidal activity, unique biochemical profile, and a new mode of action with AHAS, makes its discovery a milestone in the quest to develop sustainable weed management in agroecosystems.…”

Section: Discussionmentioning

confidence: 99%

A Novel AHAS-Inhibiting Herbicide Candidate for Controlling Leptochloa chinensis: A Devastating Weedy Grass in Rice Fields

Chen,

Yan,

Chen

et al. 2024

J. Agric. Food Chem.

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Given the prevalence of the malignant weed Chinese Sprangletop (Leptochloa chinensis (L.) Nees) in rice fields, the development of novel herbicides against this weed has aroused wide interest. Here, we report a novel diphenyl ether-pyrimidine hybrid, DEP-5, serving as a systematic pre/postemergence herbicide candidate for broad-spectrum weed control in rice fields, specifically for L. chinensis. Notably, DEP-5 exhibits over 80% herbicidal activity against the resistant biotypes even at 37.5 g a.i./ha under greenhouse conditions and has complete control of L. chinensis at 150 g a.i./ha in the rice fields. We uncover that DEP-5 acts as a noncompetitive inhibitor of acetohydroxyacid synthase (AHAS) with an inhibition constant (K i ) of 39.4 μM. We propose that DEP-5 binds to AHAS in two hydrophobic-driven binding modes that differ from commercial AHAS inhibitors. Overall, these findings demonstrate that DEP-5 has great potential to be developed into a herbicide for L. chinensis control and inspire fresh concepts for novel AHAS-inhibiting herbicide design.

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“…In this case, the persistent stimulus of hormesis does not lead to productive benefits due to the continuous plant stress. The constant disturbance significantly interferes with the biological mechanisms that ensure the compensatory adaptive processes of re-establishment of the cellular and physiological functions of plant tissues, which characterize adaptive homeostasis (32)(33) . Defoliation followed by hormesis stress results in energy and oxidative exhaustion by toxin disturbance to the plant.…”

Section: Factor Doses (D) Cultivars (B) Cuts (C) D × B B × C D × C D ...mentioning

confidence: 99%

Glyphosate induced hormesis in Urochloa cultivars with sequential application

Codognoto,

Faria,

Maltoni

et al. 2023

Ciênc. anim. bras.

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Glyphosate is the most widely used herbicide and is responsible for a significant technical/productive advance in world agriculture. Glyphosate drift after its application to control weeds in agricultural fields can stimulate growth and/or productive performance in non-target plants, located adjacent to the treatment, characterizing the hormesis effect. However, the hormesis effect of glyphosate may be different depending on the plant species, its stage of development, and the applied dose. Considering the stimulus of forage biomass production for animal feed, this study aimed to assess the hormesis effect by successive applications of low glyphosate doses to cultivars of the genus Urochloa. The shoot and root productive responses of three grass cultivars (Urochloa brizantha cv. Marandu, U. brizantha cv. Piatã, and U. ruziziensis cv. Ruziziensis) were assessed in pots through leaf applications of subdoses of the acid equivalent (ae) of glyphosate (5.40, 10.80, 21.60, 43.20, and 86.40 g ae ha-1) and a control (no glyphosate application). Four sequential harvests, conducted with a frequency of 21 days in a completely randomized design and a 6 x 3 x 4 factorial arrangement, with three replications, were assessed. Doses equal to or higher than 43.20 g ae ha-1 of glyphosate, applied in two sequential applications impaired the biomass production of the assessed forages. Ruziziensis was the most susceptible cultivar to the phytotoxic effect. Sequential applications of the subdoses 5.40 and 10.80 g ae ha-1 of glyphosate characterized the hormesis effect, promoting the shoot and root biomass production of the forage plants U. brizantha cv. Marandu, U. brizantha cv. Piatã, and U. ruziziensis cv. Ruziziensis.

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Induced Hormesis in Plants with Herbicide Underdoses

Cited by 3 publications

References 65 publications

Hormese induzida por glifosato em cultivares de Urochloa com aplicação sequencial

Hormese induzida por glifosato em cultivares de Urochloa com aplicação sequencial

A Novel AHAS-Inhibiting Herbicide Candidate for Controlling Leptochloa chinensis: A Devastating Weedy Grass in Rice Fields

Glyphosate induced hormesis in Urochloa cultivars with sequential application

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