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

• Published in: Environmental science and pollution research international Vol. 25; no. 10; pp. 9416 - 9425
• Main Authors: Dobbss, Leonardo Barros, dos Santos, Tamires Cruz, Pittarello, Marco, de Souza, Sávio Bastos, Ramos, Alessandro Coutinho, Busato, Jader Galba
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2018; Springer Nature B.V
• Subjects: Abiotic stress; Accumulation; Acids; Anacardiaceae - chemistry; Anacardiaceae - metabolism; Antioxidants; Antioxidants - chemistry; Aquatic Pollution; Ascorbic acid; Atmospheric Protection/Air Quality Control/Air Pollution; Brazil; Catalase; Composting; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Enzymatic activity; Enzymes; Free radicals; Heavy metals; Humic acids; Humic Substances; Hydroponics; Iron; L-Ascorbate peroxidase; Leaf area; Mangroves; Metal concentrations; Metals; Peroxidase; Peroxidase - chemistry; Peroxidase - metabolism; Plant Leaves; Plant resistance; Proteins; Reactive Oxygen Species; Research Article; Schinus terebinthifolius; Seedlings; Toxicity; Toxicity testing; Vermicomposting; Waste Water Technology; Water Management; Water Pollution Control; Worms; Brazil; Aroeira; Iron contamination; Antioxidative enzymatic function; Reactive oxygen species; Peroxidase; Catalase
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-018-1193-1

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.