Phosphorus Modified Biochar and Vermicompost Integration Alleviated Cd Phytotoxicity in Wheat (Triticum aestivum L.) by Improving Growth, Antioxidant Activities and Reducing Cd Uptake in Plants
摘要
Production of cereal crops on cadmium (Cd) contaminated soil has undermined the human health and food security around the world. The application of organic amendments may decrease toxic effects of Cd on plant growth and its accumulation in edible parts. A pot experiment was designed to examine the efficiency of phosphorous modified biochar (PMBC) along with vermicompost (VC) on wheat physiological, biochemical and bio-accumulation traits grown in artificially spiked Cd contaminated soil. The result of our study indicated that Cd toxicity has significantly decreased plant biomass and photosynthesis and initiated oxidative stress. The data also revealed that Cd toxicity increased the Cd bioaccumulation and translocation in wheat plants. Adding organic materials, especially combinations of PMBC and VC, helped increase the dry weight, chlorophyll levels, and antioxidant enzyme activities in the wheat plants. The increase in APX and POD activities (30%-56% and 37%-61%) and the decrease in proline and H₂O₂ levels (0.78–0.79-fold and 0.73–0.91-fold) were observed with the 2% PMBC and 2% VC combination under 5, 10, and 15 mg kg⁻1 Cd stress, respectively. Organic amendments decreased BAC by (14%-17%), BCF by (4%-10%), and TF by (4%-7%). The results proposed that the combined application of PMBC and VC has the ability to alleviate Cd phytotoxicity and bioaccumulation, and promote safe food production.