Chunguang Liu1, Zheng Dai2, Hongwen Sun3. 1. 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. 2. Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai University, Tianjin 300350, China. Electronic address: daizhengnku@163.com. 3. Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Nankai University, Tianjin 300350, China. Electronic address: sunhongwen@nankai.edu.cn.
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.
Duckweed plays a major role in the removal of n class="Chemical">nitrogen (n class="Chemical">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: Barbara R Evans; Marcus Foston; Hugh M O'Neill; David Reeves; Caroline Rempe; Kathi McGrath; Arthur J Ragauskas; Brian H Davison Journal: Planta Date: 2019-01-29 Impact factor: 4.116