Iron toxicity: effects on the plants and detoxification strategies

Lapaz, Allan de Marcos; Yoshida, Camila Hatsu Pereira; Gorni, Pedro Henrique; Freitas-Silva, Larisse de; Araújo, Talita de Oliveira; Ribeiro, Cléberson

doi:10.1590/0102-33062021abb0131

Cited by 12 publications

(1 citation statement)

References 77 publications

(117 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These polysaccharides contain strongly negatively charged sites that have a high affinity to metal ions, thus showing a strong ability to bind Fe (Ye et al, 2015). Furthermore, a gradient for the Fe reaction is evident in the endoderm region of the roots (Figure 6), evidencing the role of Casparian strips in preventing Fe translocation (Araújo et al, 2020b;Lapaz et al, 2022), together with the maintenance of the structural integrity of the vascular cylinder (Figure 5).…”

Section: Discussionmentioning

confidence: 67%

Metallic elements in plants: bioaccumulation, phytoremediation potential and physiological responses

Coelho¹

View full text Add to dashboard Cite

Pollution caused by metallic elements in the environment is becoming increasingly problematic worldwide. In the current work, several aspects of the metallic elements in plants were investigated, including the accumulation in species affected by an environmental disaster involving the disruption of a mining tailing dam; the physiological responses and phytoremediation potential of the aquatic macrophyte water lettuce (Pistia stratiotes) subjected to excess iron (Fe) and manganese (Mn), and combinations of Fe, Mn, and arsenic (As); and, finally, the in vivo monitoring of As-induced responses in Arabidopsis thaliana plants. We found a concerning enrichment of metal accumulation, especially for Fe and Mn, in the plant species evaluated in affected areas by mining tailings. Considering the spreading potential of contamination in aquatic environments, water lettuce plants, which are often used in phytoremediation studies, were tested for removal of excess Fe and Mn, along with the association with As. The plants displayed a great accumulation of Fe, mainly trapped in roots, whereas Mn was hyperaccumulated in shoots and roots. Accumulation of Mn was observed especially in the apoplast, avoiding major impairments of physiological processes. In presence of As, the plants displayed root loss as an acclimation response, followed by re-emission of the organs. Nonetheless, the specimens were able to maintain a high accumulation of the pollutants, supplied isolated or in association, demonstrating phytoremediation potential in multi- contaminated environments. Furthermore, the in vivo measurements using genetically-encoded biosensors showed intriguing stability of Mg-ATP 2− levels upon short-term arsenate (AsV) exposure. We also observed that the depletion of the GSH pool is the most likely cause of glutathione redox potential (E GSH ) oxidation. The findings presented here emphasize the importance of continuing to monitor metal-contaminated areas, as well as exposing alternatives for phytoremediation of aquatic environments and providing new insights into plant metabolism in response to pollutants. Keywords: Aquatic plants – Pollution effect. Aquatic plants – Heavy metal effects. Pistia stratiotes. Heavy metals. Aquatic plants – Metabolism.

show abstract

Section: Discussionmentioning

confidence: 67%