Potencial de Cajanus cajan e Crotalaria spectabilis parafitorremediação: absorção de arsênio e respostas antioxidativas

Felipe, Rafaella Teles Arantes; Oliveira, José Tarcísio da Silva; Leão, Gabriela Alves

doi:10.1590/s0100-67622009000200006

Cited by 14 publications

(2 citation statements)

References 38 publications

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“…Increased GR activity in roots and leaves and γ-ECS in leaves suggest GSH production mechanisms in E. crassipes roots with redox GSH status maintenance (Felipe et al, 2009).…”

Section: Accepted Articlementioning

confidence: 99%

Involvement of glutathione metabolism in Eichhornia crassipes tolerance to arsenic

et al. 2019

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Aquatic macrophytes are potentially useful for phytoremediation programmes in environments contaminated by arsenic (As). Biochemical and physiological modification analyses in different plant parts are important to understand As tolerance mechanisms. The objective was to evaluate glutathione metabolism in leaves and roots of Eichhornia crassipes (Mart.) Solms treated to As. Specimens of E. crassipes were cultured for 3 days in Clark's nutrient solution containing 7 μm As. The enzymes ATP sulphurylase (ATPS), glutathione reductase (GR), glutathione peroxidase (GSH‐Px), glutathione sulphotransferase (GST) and γ‐glutamylcysteine synthetase (γ‐ECS) activity, glutathione content, total protein and non‐protein thiols were evaluated. The ATPS activity increased in roots. GR activity in leaves and GSH‐Px in roots were lower. GST activity was higher in roots and lower in leaves, and γ‐ECS activity was higher in leaves. Glutathione levels were lower, total thiol levels were higher and non‐protein levels did not change in E. crassipes leaves and roots. Exposure to As increased enzyme activity involved with sulphur metabolism, such as ATPS. Higher GR activity and lower GSH‐Px indicate increased glutathione conjugation to As due to increased GSH availability. The higher GST activity indicates its participation in As detoxification and accumulation through As GSH conjugation. Changes in glutathione and thiol levels suggest high phytochelatin synthesis. In conclusion, the increments in ATPS, GR, GST and γ‐ECS activity indicate that these enzymes are involved in GSH metabolism and are part of the E. crassipes As detoxification mechanism.

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“…Increased GR activity in roots and leaves and γ-ECS in leaves suggest GSH production mechanisms in E. crassipes roots with redox GSH status maintenance (Felipe et al, 2009).…”

Section: Accepted Articlementioning

confidence: 99%

Involvement of glutathione metabolism in Eichhornia crassipes tolerance to arsenic

et al. 2019

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“…The release of arsenic to the environment is one of the major risk factors facing the future integrity of ecosystems, in addition to causing severe damage to human health, including mutagenic and carcinogenic effects, and heart, vascular and pulmonary diseases (Felipe et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Can ants be used as indicators of environmental impacts caused by arsenic?

Ribas

Solar

Campos³

et al. 2011

J Insect Conserv

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We evaluated ants as bioindicators of environmental impacts caused by arsenic residuals in the soil. We tested the hypotheses that the presence of arsenic in the soil affects: (1) estimates of resources and habitat condition for arboreal and epigaeic ants; (2) species richness of arboreal and epigaeic ants and (3) arboreal and epigaeic ant species composition. Ants were sampled at an inactivated raticide factory in Nova Lima, Minas Gerais, Brasil, which used arsenic as one of its main byproducts. The following environmental variables were measured: bioavailable arsenic concentration in the soil, the number and density of tree species, plant cover and leaf litter depth. The species richness of arboreal ants decreased with increased bioavailable arsenic concentration whilst epigaeic ants increased with arsenic. Arboreal ants were positively related to the number of tree species, which in turn were negatively affected by arsenic. We verified which ants are good bioindicators of arsenic. Independent verification of the influence of arsenic on background environmental variables was fundamental in defining responses of ant communities, as well as in identifying the most effective pathways for the recovery of biological communities in degraded areas.

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Morpho-anatomical and growth alterations induced by arsenic in Cajanus cajan (L.) DC (Fabaceae)

Pita-Barbosa

Gonçalves

Azevedo

2015

Environ Sci Pollut Res

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Arsenic (As) is a toxic element to most organisms. Studies investigating anatomic alterations due to As exposure in plants are scarce but of utmost importance to the establishment of environmental biomonitoring techniques. So, this study aimed to investigate the effects of As on the development and initial root growth in Cajanus cajan (Fabaceae), characterize and quantify the possible damages, evaluate genotoxic effects, and identify structural markers to be used in environmental bioindication. Plants were exposed hydroponically to 0.5, 1.0, 1.5, and 2.0 mg As L(-1), as sodium arsenate. Growth parameters were measured, and in the end of the exposure, root samples were analyzed for qualitative and quantitative anatomical alterations. Arsenic genotoxicity was evaluated through analysis of the mitotic index in the root apex. Compared to the control, As-treated seedlings showed an altered architecture, with significantly decreased root length (due to the lower mitotic index in the apical meristem and reduced elongation of parenchyma cells) with darkened color, and abnormal development of the root cap. A significant increase in vascular cylinder/root diameter ratio was also detected, due to the reduction of the cellular spaces in the cortex. The secondary xylem vessel elements were reduced in diameter and had sinuous walls. The severest damage was visible in the ramification zone, where uncommon division planes of phellogen and cambium cells and disintegration of the parenchyma cells adjacent to lateral roots were observed. The high sensibility of C. cajan to As was confirmed, since it caused severe damages in root growth and anatomy. The main structural markers for As toxicity were the altered root architecture, with the reduction of the elongation zone and increase of ramification zone length, and the root primordia retained within the cortex. Our results show a new approach about As toxicity and indicate that C. cajan is a promising species to be used for bioindication of environmental contamination by As.

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Potencial de Cajanus cajan e Crotalaria spectabilis parafitorremediação: absorção de arsênio e respostas antioxidativas

Cited by 14 publications

References 38 publications

Involvement of glutathione metabolism in Eichhornia crassipes tolerance to arsenic

Involvement of glutathione metabolism in Eichhornia crassipes tolerance to arsenic

Can ants be used as indicators of environmental impacts caused by arsenic?

Morpho-anatomical and growth alterations induced by arsenic in Cajanus cajan (L.) DC (Fabaceae)

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