Abstract
The effects of Na2EDTA and HNO3 on Ni2+ uptake by Spinacia oleracea seedlings replanted inhydroponic culture in a greenhouse was investigated. Eight week old seedlings, were exposed to various doses of Ni2+ (0, 1000, 2000, and 4000 mg/L) as NiSO4, at (0, 500 and 3000 mg/L) Na2EDTA and ( 0, 500 and 3000 mg /L) HNO3 in different combinations. There was a substantial increase in nickel uptake in chelated treatments (p < 0.05) compared to unchelated treatments of same concentrations of Ni2+. So, chelation enhanced Ni2+ uptake in S. oleracea. During the exposure, antioxidant defense system helped the plant to protect itself from the damage. Due to increasing nickel uptake by the plant, the photosynthetic pigments (i.e chlorophyll a, chlorophyll b and Caretenoids) gradually declined. In this study, Spinacia oleracea Seedlings and contents of the photosynthetic pigments (chlorophyll a, chlorophyll b and Caretenoids) of both chelated and unchelated hydroponic treatments were investigated. Changes in photosynthetic pigments was significant (p < 0.05) with respect to addition of EDTA and HNO3 at different concentration to different concentrations of Ni2+ compared to unchelated treatments of same concentrations of Ni2+. The Ni2+ induced translocation factor was also determined which increased significantly (P < 0.05) with increasing Ni2+ concentrations.
Highlights
Wastewater from many sources, including industries, kitchen sinks and mining sites has been found to contain traces of nickel (Carocci et al, 2016)
This research is a demonstration of the extent of damage caused and the stress level undergo by Spinacia oleracea Seedlings under nickel toxicity for a particular treatment and the effects of various doses of Na2EDTA on nickel at it stable form
Nickel content in Spinacia oleracea Seedlings: Nickel concentration in roots and shoots of spinach plants were significantly increased (p
Summary
Wastewater from many sources, including industries, kitchen sinks and mining sites has been found to contain traces of nickel (Carocci et al, 2016). Human exposure to highly nickel-concentrated environments may cause a variety of health effects. Nickel is essential for plant in low concentration but high concentration is toxic. Nickel is naturally occurring in soil and surface water with concentration lower than 100 and 0.005 ppm, respectively (Chen et al, 2009). Nickel is an essential micronutrient for some higher plants, it acts as enzyme co- factor and is beneficial for plants in trace quantities, but higher concentrations pose toxic effects to plant growth. Chelating agents helps in translocating metal from roots to shoot system of plants (Chen et al, 2020). Chloride can increase metal solubility, which may enhance metal bioaccumulation in shoots and roots of plants; only a few studies have been conducted on the effects of chloride on nickel (He et al, 2020). Studies on the effects of chloride on Ni phytoremediation are limited
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