Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Instituto de Ciências Agrárias (ICA), Avenida Vereador João Narciso, 1380, Cachoeira, Unaí, MG, 38610-000, Brazil.
Centro de Biociências e Biotecnologia (CBB), Laboratório de Biotecnologia (LBT), Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Avenida Alberto Lamego, 2000, Parque Califórnia, Campos dos Goytacazes, RJ, 28013-602, Brazil.
Environ Sci Pollut Res Int. 2018 Apr;25(10):9416-9425. doi: 10.1007/s11356-018-1193-1. Epub 2018 Jan 19.
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.
巴西东南部圣埃斯皮里图州的工业支柱之一是铁矿石加工产品。这一活动导致沿海污染程度很高，因为铁颗粒沉积在红树林和休息区等脆弱生态系统上。Schinus terebinthifolius（巴西栗）是一种广泛分布的休息区物种。本研究在水培条件下测试了蚯蚓堆肥腐殖质（HS）对巴西栗幼苗铁毒性的缓解作用。过氧化氢酶、过氧化物酶和抗坏血酸过氧化物酶是作为活性氧（ROS）清除剂的抗氧化酶：它们的活性增加是由于金属积累或腐殖质刺激导致 ROS 浓度升高的结果。用 HS 和 Fe 处理的 S. terebinthifolius 幼苗的抗氧化酶活性显著低于单独用 HS 和 Fe 处理的幼苗；它们的铁积累量显著较低，根和叶面积略有增加，这证实了 HS 的生物刺激作用及其在阻止铁在根部以外过量积累方面的作用。HS 的使用可用于受重金属污染地区的恢复。
