title: Potential of duckweed (Lemna minor) for removal of nitrogen and phosphorus from water under salt stress.
abstract: Duckweed plays a major role in the removal of nitrogen (N) and phosphorus (P) from water. To determine the effect of salt stress on the removal of N and P by duckweed, we cultured Lemna minor, a common species of duckweed, in N and P-rich water with NaCl concentrations ranging from 0 to 100 mM for 24 h and 72 h, respectively. The results show that the removal capacity of duckweed for N and P was reduced by salt stress. Higher salt stress with longer cultivation period exerts more injury to duckweed and greater inhibition of N and P removal. Severe salt stress (100 mM NaCl) induced duckweed to release N and P and even resulted in negative removal efficiencies. The results indicate that L. minor should be used to remove N and P from water with salinities below 75 mM NaCl, or equivalent salt stress.
authors.affiliation: Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Tianjin 300350, China. Electronic address: liuchunguang@nankai.edu.cn.
authors.forename: Chunguang
authors.initials: C
authors.lastname: Liu
authors.affiliation: Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai University, Tianjin 300350, China. Electronic address: daizhengnku@163.com.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Dai
authors.affiliation: Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai University, Tianjin 300350, China. Electronic address: sunhongwen@nankai.edu.cn.
authors.forename: Hongwen
authors.initials: H
authors.lastname: Sun
mesh_terms: D029064:Araceae / Q000187:drug effects / Q000378:metabolism*; D002681:China; D006801:Humans; D060106:Lakes; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D045483:Rivers; D012965:Sodium Chloride / Q000494:pharmacology; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D012965:Sodium Chloride; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Duckweed; Lemna minor; Nitrogen; Phosphorus; Salt stress