Journal
ECOLOGICAL ENGINEERING
Volume 58, Issue -, Pages 355-362Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2013.06.031
Keywords
Lemna minor; Ammonium; Oxidative stress; Uptake kinetics; Relative growth rate; Antioxidative response; Membrane lipid peroxidation
Funding
- National Key Technology RD Program [2012BAJ25B09]
- Ministry of Education PR China [0903005109081/012]
- Natural Science Foundation Project of CQ CSTC [cstcjjA20001]
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This study investigates ammonium (NH4+) uptake kinetics, growth characteristics, and antioxidative response of Lemna minor L. to NH4+ exposure. L. minor was exposed to different NH4+ levels (0.5, 1, 2, 3, and 4 mM) for various contact durations (1, 3, 5, 9, and 14 d). L. minor grew well in 0.5-3.0 mM NH4+, with a relative growth rate of 0.046-0.048 d(-1). The maximum uptake velocity was achieved at 0.066 mg g(-1) FW h(-1), and the growth velocity could be fitted well with the Michaelis-Menten function (R-2 = 0.90507). Plant growth was suppressed, and the chlorophyll and carotenoid contents decreased after 14-day of exposure on 4 mM NH4+. 4 mM NH4+ induced oxidative stress and heated the antioxidative response in L. minor after 5-day of exposure. Superoxide dismutase activity increased in contrast to the peroxidase activity decreasing compared with control. The increased malondialdehyde indicated membrane lipid peroxidation because of incomplete antioxidative reactions. (C) 2013 Elsevier B.V. All rights reserved.
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