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Alleviation of iron toxicity in Schinus terebinthifolius Raddi (Anacardiaceae) by humic substances

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Abstract

One of the industrial pillars of Espírito Santo state, South East of Brazil, is iron-mining products processing. This activity brings to a high level of coastal pollution due to deposition of iron particulate on fragile ecosystems as mangroves and restinga. Schinus therebinthifolius (aroeira) is a widespread restinga species. This work tested iron toxicity alleviation by vermicompost humic substances (HS) added to aroeira seedlings in hydroponic conditions. Catalase, peroxidase, and ascorbate peroxidase are antioxidant enzymes that work as reactive oxygen species (ROS) scavengers: they increase their activity as an answer to ROS concentration rise that is the consequence of metal accumulation or humic substance stimulation. S. terebinthifolius seedlings treated with HS and Fe augmented their antioxidant enzyme activities significantly less than seedlings treated separately with HS and Fe; their significantly lower Fe accumulation and the slight increase of root and leaf area confirm the biostimulating effect of HS and their role in blocking Fe excess outside the roots. The use of HS can be useful for the recovery of areas contaminated by heavy metals.

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Acknowledgments

Authors thank Dr. Pitolas Armini for the map of ports and the seed collection area, to FAPES—Fundação de Amparo à Pesquisa do Espírito Santo for the scholarship granted for the project, to University Vila Velha (UVV), and to the National Council of Technological and Scientific Development.

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Correspondence to Leonardo Barros Dobbss.

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Responsible editor: Philippe Garrigues

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Dobbss, L.B., dos Santos, T.C., Pittarello, M. et al. Alleviation of iron toxicity in Schinus terebinthifolius Raddi (Anacardiaceae) by humic substances. Environ Sci Pollut Res 25, 9416–9425 (2018). https://doi.org/10.1007/s11356-018-1193-1

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  • DOI: https://doi.org/10.1007/s11356-018-1193-1

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