1. Remediation potential of biochar and selenium for mitigating chromium-induced stress in spinach to minimize human health risk.
- Author
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Sami, Hira, Ashraf, Kamran, Sultan, Khawar, Alamri, Saud, Abbas, Moneeza, Javied, Sabiha, and Zaman, Qamar uz
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BIOCHAR , *SPINACH , *PLANT biomass , *SELENIUM , *HEALTH risk assessment , *SOIL pollution , *AGRICULTURAL productivity - Abstract
• Heavy metals and metalloids stress is a major threat to agricultural productivity and sustainability. • Chromium stress significantly decreased the growth, physio-biochemical, and osmolyte status in spinach. • Induced chromium stress improved electrolyte leakage and enzymatic antioxidants in spinach leaves. • Soil applied biochar and foliage applied selenium promotes a biostimulant effect by increasing spinach plant biomass. • Combined application of biochar and selenium helped in the adaptation of spinach to mild chromium stress. The contamination of agricultural soils with metals and metalloids significantly affects crop productivity. The objective of the present study was to investigate how the combined application of biochar and selenium (Se) could mitigate the adverse effects of chromium (Cr) stress on spinach. The effects of selenium (Na 2 SeO 4) (1 mg L −1) and biochar (5 %, w/w) application both individually and in combination were evaluated on the basis of growth, physio-biochemical and antioxidant potential of spinach grown under Cr stress (100 µM [29.40 mg] using K 2 Cr 2 O 7 of soil) and without Cr stress as control (0 µM). The results indicated that Cr stress decreased the root length (34.62 %), shoot length (35.32 %), number of leaves (23.18 %), root dry weight (12.00 %), and leaf dry weight (24.36 %) under Cr stress by lowering relative water content (RWC) and chlorophyll concentrations due to increased electrolyte leakage (64.03 %) and the Cr accumulation in leaves. However, the combined application of biochar and Se significantly enhanced the fresh and dry biomass under Cr stress and control conditions. The synergistic effect of Se and biochar partly alleviates the effects of Cr stress in spinach by up-regulating the antioxidant system, reducing lipid peroxidation (60.00 %), increasing leaf soluble sugars (25.22 %), and simultaneously decreasing electrolyte leakage. The combined effect of Se and biochar proved better results as compared to the sole application in minimizing Cr uptake in leaves (52.08 %) and limiting the health risk assessment values. Overall, this study highlights that the combined application of biochar and Se is an innovative and eco-friendly approach to improving the physio-biochemical defense responses against Cr stress in spinach plants. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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