Sulfur metabolism: Different tolerances of two aquatic macrophytes exposed to arsenic

Leão, Gabriela Alves; Oliveira, Juraci Alves de; Farnese, Fernanda dos Santos; Gusman, Grasielle Soares; Felipe, Rafaella Teles Arantes

doi:10.1016/j.ecoenv.2014.03.011

Cited by 26 publications

(12 citation statements)

References 41 publications

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“…The GPX showed participation in antioxidant defenses in the S. molesta floating leaves. Similar results have been observed in Lemna gibba subjected to As V (Leão et al 2014) and rice seedlings treated with As III (Mishra et al 2011). Conversely, decreases in submerged leaves and may have contributed to further cellular damage in these organs.…”

Section: Adinan Alves Da Silva Juraci Alves De Oliveira Fernanda VIsupporting

confidence: 84%

“…Peter Henry Rolfs, s/n, 36570-000, Viçosa, MG, Brazil 2 Departamento de Biologia Geral, Universidade Federal de Viçosa, Av. Peter Henry Rolfs, s/n, 36570-000, Viçosa, MG, Brazil 3 Laboratório de Ecofi siologia Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano-Campus Rio Verde, 75901-970, Rio Verde, GO, Brazil Adinan Alves da Silva, Juraci Alves de Oliveira, Fernanda Vidal de Campos, Cleberson Ribeiro and Fernanda dos Santos Farnese Eichhornia crassipes (Alvarado et al 2008), Pistia stratiotes (Farnese et al 2013), and Lemna gibba (Leão et al 2014). The As III absorbed by the plant affects physiological processes such as photosynthesis and growth, besides promoting cell damage (Farooq et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Role of glutathione in tolerance to arsenite in Salvinia molesta, an aquatic fern

et al. 2017

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In many plant species, tolerance to toxic metals is highly dependent on glutathione, an essential metabolite for cellular detoxifi cation. We evaluated the responses of glutathione metabolism to arsenite (As III) in Salvinia molesta, an aquatic fern that has unexplored phytoremediation potential. Plants were exposed to diff erent As III concentrations in nutrient solution for 24 h. As III caused cell membrane damage to submerged leaves, indicating oxidative stress. Th ere was an increase in the glutathione content and ϒ-glutamylcysteine synthetase enzyme activity in the submerged and fl oating leaves. Th e glutathione peroxidase and glutathione sulfotransferase enzymes also showed increased activity in both plant parts, whereas glutathione reductase only showed increased activity in the submerged leaves. Th ese fi ndings suggest an important role for glutathione in the protection of S. molesta against the toxic eff ects of As III , with more eff ective tolerance responses in the fl oating leaves.

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Section: Adinan Alves Da Silva Juraci Alves De Oliveira Fernanda VIsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Role of glutathione in tolerance to arsenite in Salvinia molesta, an aquatic fern

et al. 2017

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“…ROS generation naturally occurs as a consequence of aerobic metabolism, and, in normal cell conditions, their homeostasis is carefully balanced, keeping their levels approximately constant. In stressful conditions, however, ROS generation increases quickly and expressively, affecting organelles and plant processes, which, ultimately, interfere in the growth and survival of the plant (Leão et al, 2014; Rofkar et al, 2014). …”

Section: Introductionmentioning

confidence: 99%

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

et al. 2017

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High arsenic (As) concentrations are toxic to all the living organisms and the cellular response to this metalloid requires the involvement of cell signaling agents, such as nitric oxide (NO). The As toxicity and NO signaling were analyzed in Pistia stratiotes leaves. Plants were exposed to four treatments, for 24 h: control; SNP [sodium nitroprusside (NO donor); 0.1 mg L-1]; As (1.5 mg L-1) and As + SNP (1.5 and 0.1 mg L-1, respectively). The absorption of As increased the concentration of reactive oxygen species and triggered changes in the primary metabolism of the plants. While photosynthesis and photorespiration showed sharp decrease, the respiration process increased, probably due to chemical similarity between arsenate and phosphate, which compromised the energy status of the cell. These harmful effects were reflected in the cellular structure of P. stratiotes, leading to the disruption of the cells and a possible programmed cell death. The damages were attenuated by NO, which was able to integrate central plant physiological processes, with increases in non-photochemical quenching and respiration rates, while the photorespiration level decreased. The increase in respiratory rates was essential to achieve cellular homeostasis by the generation of carbon skeletons and metabolic energy to support processes involved in responses to stress, as well to maintaining the structure of organelles and prevent cell death. Overall, our results provide an integrated view of plant metabolism in response to As, focusing on the central role of NO as a signaling agent able to change the whole plant physiology.

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“…Also in the diatom Phaeodactylum tricornutum ATPS activity was very sensitive to H 2 O 2 (Rosenwasser et al, 2014). The ATPS activity of the aquatic plants Lemna gibba and Salvinia minima exposed to arsenic greatly increased, together with the activities of γ-glutamylcysteine synthetase, glutathione S-transferase and glutathione reductase (Leao et al, 2014). An increase in the abundance of ATPS mRNA was observed in Brassica juncea roots exposed to Cd, but not in the presence of other heavy metals (Lee and Leustek, 1999).…”

Section: Regulation Of Atps Expression and Activitymentioning

confidence: 99%

Diversity and regulation of ATP sulfurylase in photosynthetic organisms

et al. 2014

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ATP sulfurylase (ATPS) catalyzes the first committed step in the sulfate assimilation pathway, the activation of sulfate prior to its reduction. ATPS has been studied in only a few model organisms and even in these cases to a much smaller extent than the sulfate reduction and cysteine synthesis enzymes. This is possibly because the latter were considered of greater regulatory importance for sulfate assimilation. Recent evidences (reported in this paper) challenge this view and suggest that ATPS may have a crucial regulatory role in sulfate assimilation, at least in algae. In the ensuing text, we summarize the current knowledge on ATPS, with special attention to the processes that control its activity and gene(s) expression in algae. Special attention is given to algae ATPS proteins. The focus on algae is the consequence of the fact that a comprehensive investigation of ATPS revealed that the algal enzymes, especially those that are most likely involved in the pathway of sulfate reduction to cysteine, possess features that are not present in other organisms. Remarkably, algal ATPS proteins show a great diversity of isoforms and a high content of cysteine residues, whose positions are often conserved. According to the occurrence of cysteine residues, the ATPS of eukaryotic algae is closer to that of marine cyanobacteria of the genera Synechococcus and Prochlorococcus and is more distant from that of freshwater cyanobacteria. These characteristics might have evolved in parallel with the radiation of algae in the oceans and the increase of sulfate concentration in seawater.

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Sulfur metabolism: Different tolerances of two aquatic macrophytes exposed to arsenic

Cited by 26 publications

References 41 publications

Role of glutathione in tolerance to arsenite in Salvinia molesta, an aquatic fern

Role of glutathione in tolerance to arsenite in Salvinia molesta, an aquatic fern

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

Diversity and regulation of ATP sulfurylase in photosynthetic organisms

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