title: [Impact of dissolved organic matter on plant uptake of phenanthrene and its mechanisms].
abstract: Hydroponic assays were conducted to investigate the influence of dissolved organic matter on uptake of phenanthrene by wheat as well as its mechanisms. The results showed that, under hydroponic condition, phenanthrene impairment of plant growth occurred with wheat growth inhibited rate of 18.01%. The impairment would be greatly enhanced in the presence of dissolved organic matter (DOM) derived from pig manure, and the inhibited rate increased to 24.38%. Wheat could uptake and accumulate phenanthrene in the nutrient solution, which could be escalated by DOM, as indicated by wheat root bioconcentration factor being increased to 37.63 L x kg(-1) in the presence of DOM from 2.84 L x kg(-1) in the absence of DOM. At the same time, DOM could facilitate phenanthrene translocation from plant roots to the upper. As a result, the pH value of nutrient solution could increase by more than 1 unit when the co-existence of DOM and phenanthrene occurred in solution, suggesting that H+ -phenanthrene cotransport system is involved in the uptake of phenanthrene by plants. A synergism was also found between wheat uptakes of phenanthrene and inorganic nutrients, Moreover, DOM accelerated markedly the synergism. It is concluded that DOM affects the uptake of phenanthrene by plants and the environmental behaviors of phenanthrene.
authors.affiliation: Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Xin-hua
authors.initials: XH
authors.lastname: Zhan
authors.forename: Li-xiang
authors.initials: LX
authors.lastname: Zhou
authors.forename: Yin-jing
authors.initials: YJ
authors.lastname: Wan
authors.forename: Ting-hui
authors.initials: TH
authors.lastname: Jiang
mesh_terms: D000042:Absorption; D000818:Animals; D017753:Ecosystem; D005308:Fertilizers; D018527:Hydroponics; D008372:Manure; D009930:Organic Chemicals / Q000737:chemistry / Q000378:metabolism; D010616:Phenanthrenes / Q000378:metabolism*; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism*; D012995:Solubility; D013552:Swine; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism
chemical_list: D005308:Fertilizers; D008372:Manure; D009930:Organic Chemicals; D010616:Phenanthrenes; D012989:Soil Pollutants; C031181:phenanthrene