Characteristics Of Different Varieties Of Water Spinach Root Exudates And Their Cumulative Effect On The Absorption Of Heavy Metals

Six kinds of spinaches, such as spinach white, willow bones spinach, Thailand bamboospinach, white stems spinach, large leaf spinach, water spinach, Jiangxi original species in werecultivated in soils contaminated with heavy metals Cd, Zn, Pb compound in order to carry outsoil culture experiments. Six varieties of spinach rhizosphere and non-rhizosphere solution werecollected to measure the content of heavy metals in the rhizosphere and nutrient solutionelements. DOC, soluble sugars, small molecule organic acids, amino acid content of the sixspinaches root exudates were measured. From the perspective of the root, exudates of heavymetals accumulated differences varieties of spinach correlation were anlysized, and here are theresults.The contents of heavy mentals such as Cd, Pb, Cu, Zn levels in six kinds of spinaches werebelow the safety limit. Cr contents of the1stspinach white willow and the3rd Thailand bambooboth exceeded safety limits, while in the other four kinds of spinaches Cr contents were belowthe safety limit. For spinach enrichment factor, Cd> Cu> Zn> Cr> Pb. Transfer coefficient forwater spinach was Cd> Zn> Cu> Cr> Pb.DOC secretion of spinach rhizosphere solution, free amino acids, soluble sugar contentwere measured. The order of DOC in the six kinds of spinaches was3>5>4>6>1>2. Cr, Cucontents in the rhizosphere solution and DOC content in the solution root exudates weresignificantly correlated. Heavy metals Cd, Cr, Zn, Pb contents in the rhizosphere solution andfree amino acids in root exudates at the0.05level were significantly correlated. oluble sugarcontent have differences, Rhizosphere secretions soluble sugar content was significantlyassociated with rhizosphere soil solution Cu content.Organic content of six spinach secretion were different, with higher levels of maleic acidand tartaric acid. The general order of magnitude performance organic acid content was: maleicacid> tartaric acid> acetic acid> malic acid> oxalic acid> succinic acid> citric acid> formicacid> propionic acid> fumaric acid. And citric acid and malic acid and contents of heavy metalsCd, Cu, Pb, Cu, Zn in the soil solution were significantly correlated.