Physiological changes and in the carbohydrate content of sunflower plants submitted to sub-doses of glyphosate and trinexapac-ethyl

Vital, Roberto Gomes; Jakelaitis, Adriano; Silva, Fábia Barbosa; Batista, Priscila Ferreira; Almeida, Gabriel Martins; Costa, Alan Carlos; Rodrigues, Aline Sueli de Lima

doi:10.1590/1678-4499.540

Cited by 18 publications

(11 citation statements)

References 34 publications

(23 reference statements)

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“…Notably, the values of A in WD conditions suggest that the imposed stress was not severe. These values were close to the values found by Vital et al (2017) in sunflower plants, but in the control treatment.…”

Section: Resultssupporting

confidence: 90%

“…This result indicates an important role of these substances in the antioxidant metabolism of sunflower plants because plants that received only water spray in the WD condition accumulated 46% more MDA than the WW condition. The MDA content observed in this work under optimal conditions (WW condition with spraying only water) was compatible with that observed by Vital et al (2017), also under control conditions, which indicates that the plants in the WP treatment were under oxidative stress in the WD condition. [NPQ, (c)], electron transport rate [ETR, (d)], excess energy related to PSII [EXC, (e)], and the ratio ETR/A (f) of sunflower plants after 10 days under substrate humidity (SH) conditions of 100% (well-watered, WW) and 30% (water deficit, WD) of the field capacity (FC) combined with the spraying of alleviators: potassium phosphite (KPhi), zinc sulfate (ZS), hydrogen sulfide (HS) donor NaHS, and without product (WP).…”

Section: Resultssupporting

confidence: 87%

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Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

et al. 2020

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Drought is the most harmful environmental factor crop productivity. Some chemicals are used in agriculture to mitigate the damage from this stress on plants. Therefore, we examined whether the spraying of zinc sulfate (ZS), potassium phosphite (KPhi) and the hydrogen sulfide (H2S) donor sodium hydrosulfide (NaHS) would mitigate the deleterious effects of water deficit on sunflower plants by analyzing physiological and biometric characteristics. The experiment was carried out in a greenhouse using a randomized block design with five replications. The treatments were arranged in a 4 x 2 factorial scheme: [Factor A (Alleviators)] - spraying of KPhi (0.5 L ha-1), ZS (3.2 kg ha-1), NaHS (1.2 g ha-1), and water; [Factor B (substrate humidity, SH)] - 100% (well irrigated) and 30% (water deficit, WD) of field capacity. Under WD conditions, alleviators led to the maintenance of higher values of water potential (ΨW), a lower content of leaf malonaldehyde (MDA), and increased activity of the antioxidant enzyme peroxidase (POX), except for ZS. However, leaf osmotic potential, proline concentration, variables related to gas exchange and chlorophyll a fluorescence, and biometric characteristics differed only according to the SH factor. The results of ΨW and MDA for sunflower plants under WD are indicative of the mitigating capacity of ZS, KPhi, and H2S. Thus, the spraying of these compounds on sunflower plants mitigates the effects of WD, acting specifically in physiological processes related to antioxidant responses and in the maintenance of water in leaf tissues.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 87%

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

et al. 2020

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“…The increase in the rate of electrolyte leakage (REL), mainly in 7739 M and Anta 82 cultivars (Fig. 5D), suggests the degradation of cell membranes, in monitoring damage to cell membranes in sunflower leaves (Vital et al, 2017). The ROS accumulation was not measured, but the increase in REL is a good indicator of lipid peroxidation and oxidant damage (Carvalho, 2008).…”

Section: Discussionmentioning

confidence: 99%

Physiological tolerance to drought under high temperature in soybean cultivars

et al. 2019

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Soybean is one of the most economically important crops and has experienced adverse physiological and biochemical effects when subjected to drought stress and heat, resulting in lost productivity. Thus, the objective of this work was to evaluate the physiological, metabolic and growth responses of well-watered and drought-treated soybean cultivars under high temperature. The experimental design was set up in randomized blocks, in a factorial scheme with three soybean cultivars (7739 M, Anta 82 and Desafio) and two water levels (100% and 40% field capacity). The experiment was conducted in a controlled growth chamber with a gradual rise in temperature at 41°C for 5 hours daily. Morpho-physiological and metabolic analyses were performed 12 days after the treatments imposition. The parameters of water and osmotic potentials, relative water content, photosynthetic rate, stomatal conductance, transpiratory rate, electron flux for the carboxylation and oxygenation of RuBisCO were decreased for all cultivars under water deficit and high temperature. The results showed that the photorespiration and the rate of electrolyte leakage were increased as well. These results showed that these physiological behaviors are standard for soybean plants under water deficit, regardless of cultivars. The cultivars 7739 M and Desafio showed lower performance than the cultivar Anta 82 for the parameters of total electron flow and effective quantum yield of PS II. The 7739 M and Anta 82 were the only cultivars to show increased nonphotochemical quenching dissipation and total soluble sugar content, respectively, under stress conditions. Desafio cultivar demonstrated greater physiological and growth traits stability, which could potentially indicate double tolerance to these stresses.

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“…Actually, when plants were exposed to light intensities similar to those experienced during growth, the values of ΦPSII and rETR were increased in response to GLY treatments, suggesting that the observed decrease in chlorophyll content, as well as the depletion of gene expression of D1 and CP47, did not result in photochemical damage, at least under these conditions. Although the rETR (rETR = ΦPSII × PPFD) does not reflect the absolute electron flow across thylakoids membrane, this formula has been widely used in stress physiology studies to report the electron transport rate occurring at a given light intensity in different photoautotrophic organisms and types of samples (Garrido et al, 2019;Masojídek et al, 2001;Ritchie, 2012;Williams et al, 2009;Zivcak et al, 2013), and more specifically on studies dealing with effects of GLY on photosynthesis (Gomes et al, 2017;Yanniccari et al, 2012;Zobiole et al, 2010a;Gomes et al, 2016b;Vital et al, 2017). Besides, even if it is conceivable that GLY, as other stress signals (Sukhova et al, 2018), could have affected p (fraction of PPFD absorbed by leaves) and dII (multiplication factor since the transport of a single electron requires the absorption of two photons), ETR is largely determined by ΦPSII (Genty et al, 1989).…”

Section: Gly-induced Reduction Of D1 Cp47 and Rubisco Genes Transcription And Pigment Levels Does Not Inhibit Photochemical Reactions Of mentioning

confidence: 99%

Glyphosate-dependent effects on photosynthesis of Solanum lycopersicum L.—An ecophysiological, ultrastructural and molecular approach

Soares

Pereira

Martins

et al. 2020

Journal of Hazardous Materials

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This study aimed to assess the toxicity of glyphosate (GLY; 0, 10, 20 and 30 mg kg −1 ) in Solanum lycopersicum L., particularly focusing on the photosynthetic metabolism. By combining ecophysiological, ultrastructural, biochemical and molecular tools, the results revealed that the exposure of tomato plants to GLY led to alterations in leaf water balance regulation [increasing stomatal conductance (g s ) and decreasing water use efficiency (WUE i ) at higher concentrations] and induced slight alterations in the structural integrity of cells, mainly in chloroplasts, accompanied by a loss of cell viability. Moreover, the transcriptional and biochemical control of several photosynthetic-related parameters was reduced upon GLY exposure. However, in vivo chlorophyll fluorometry and IRGA gas-exchange studies revealed that the photosynthetic yield of S. lycopersicum was not repressed by GLY. Overall, GLY impacts cellular and subcellular homeostasis (by affecting chloroplast structure, reducing photosynthetic pigments and inhibiting photosynthetic-related genes transcription), and leaf structure, but is not

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Physiological changes and in the carbohydrate content of sunflower plants submitted to sub-doses of glyphosate and trinexapac-ethyl

Cited by 18 publications

References 34 publications

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

Physiological tolerance to drought under high temperature in soybean cultivars

Glyphosate-dependent effects on photosynthesis of Solanum lycopersicum L.—An ecophysiological, ultrastructural and molecular approach

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