title: Effects of root exudates on gel-beads/reeds combination remediation of high molecular weight polycyclic aromatic hydrocarbons.
abstract: Changes in root exudates, including low molecular weight organic acids (LMWOAs), amino acids and sugars, in rhizosphere soils during the gel-beads/reeds combination remediation for high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) and the degree of the effects on HMW-PAH biodegradation were evaluated in this study. The results showed that the gel-beads/reeds combination remediation notably increased the removal rates of pyrene, benzo(a)pyrene and indeno(1,2,3-cd)pyrene (65.0-68.9%, 60.0-68.5% and 85.2-85.9%, respectively). During the removal of HMW-PAHs, the LMWOAs, particularly maleic acid, enhanced the biodegradation of HMW-PAHs. Arginine and trehalose monitored in reed root exudates promoted the growth of plants and microorganisms and then improved the removal of HMW-PAHs, especially pyrene. However, the contribution of reed root exudates on degradation of 5- and 6-ring PAHs was minor. These results indicated that the utilization of root exudates was certainly not the only important trait for the removal of HMW-PAHs.
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, PR China. Electronic address: weijunas@ouc.edu.cn.
authors.forename: Weijun
authors.initials: W
authors.lastname: Tian
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
authors.forename: Kaili
authors.initials: K
authors.lastname: Qiao
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D052918:Environmental Restoration and Remediation; D008298:Maleates / Q000737:chemistry; D008970:Molecular Weight; D018517:Plant Roots / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000378:metabolism; D058441:Rhizosphere; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism; D014199:Trehalose / Q000737:chemistry
chemical_list: D000596:Amino Acids; D008298:Maleates; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; C030272:maleic acid; D014199:Trehalose
keywords: Arginine; Gel-beads; High molecular weight polycyclic aromatic hydrocarbons (HMWPAHs); Low molecular weight organic acids (LMWOAs); Reed; Trehalose