Role of phosphorus on the biogeochemical behavior of cadmium in the contaminated soil under leaching and pot experiments  

作　　者：Hui Jia YifanWu Mengqi Zhang Jinhui Ye Daolin Du He Wang 

机构地区：[1]Institute of Environment and Ecology,School of Emergency Management,Jiangsu University,Zhenjiang 212013,China [2]School of the Environment and Safety Engineering&Institute of Environment and Ecology,Jiangsu University,Zhenjiang 212013,China [3]Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,China [4]Xuzhou Medical University,Affiliated Hospital,Xuzhou 221004,China

出　　处：《Journal of Environmental Sciences》2024年第3期488-499,共12页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of Jiangsu Province (No.BK20210751);China Postdoctoral Research Foundation (No.2022M711389);the Carbon Peak and Carbon Neutrality Technology Innovation Foundation of Jiangsu Province (No.BK20220030)。

摘　　要：Phosphorus(P)is involved in various biochemical reactions in plant growth,so it is beneficial to plants growing in soils contaminated by metals,including cadmium(Cd).However,few studies have reported on the mechanistic roles of P in mitigating Cd toxicity to ryegrass root,and especially in alleviating the disruption of the mitochondrial function of living cells.In this study,the physiological and biochemical mechanisms associated with ryegrass growth under various Cd and P treatments were investigated using leaching and pot systems.The concentration of Cd in soil leachates showed a significantly positive relationship with redox potential(P<0.05),but negative relationship(P<0.05)with leachate pH values and dissolved organic carbon(DOC),indicating that exogenous P addition(as H_(2)PO_(4)*)may decrease Cd leaching from contaminated soil.Compared to the control(without P addition),the cumulative Cd content was reduced by 53.3%and 64.5%in the soil leachate with exogenous P application(20 mg/L and 80 mg/L),respectively.Notably,application of P decreased the Cd concentrations in the symplastic fractions and increased the Cd concentrations in the apoplastic fractions in root tips,which may help to alleviate Cd stress to the protoplast.Moreover,exogenous P was found to play a positive role in mitochondrial function and Ca^(2+)variation in root cells under Cd stress,which provides novel insights into the mechanisms of exogenous P in alleviating plant Cd injury.

关 键 词：PHOSPHORUS Cadmium stress PROTOPLAST Biogeochemical behavior Mitochondrial function 

分 类 号：X53[环境科学与工程—环境工程] P593[天文地球—地球化学]