title: [Physiological responses of Ceratophyllum demersum under different nutritional conditions].
abstract: With static experiments, this paper investigated the protein and chlorophyll contents, and the peroxidase (POD) and superoxide dismutase (SOD) activities of Ceratophyllum demersum cultured in meso-, eutro- and hypertrophic and Hoagland's solutions. The results showed that the changes of total N (TN) and total P (TP) concentrations in nutrient solutions had an obvious effect on the biosynthesis of C. demersum. When the concentrations of TN and TP were less than 1 mg x L(-1) and 0.1 mg x L(-1), respectively, the protein and chlorophyll contents of plant declined. The plant from eutrophic solution had higher SOD and POD activities. It was indicated that C. demersum was more preferable to eutropic condition (1 mg TN x L(-1) and 0.1 mg TP x L(-1)), and the raised concentration of nutrients (e. g., hypertrophic and Hoagland's solutions) was a stress to C. demersum and could affect its hardiness physiology.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China. wjzw-521@sohu.com
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Yufei
authors.initials: Y
authors.lastname: Gu
authors.forename: Zengyin
authors.initials: Z
authors.lastname: Zhu
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Daqiang
authors.initials: D
authors.lastname: Yin
mesh_terms: D017753:Ecosystem; D004784:Environmental Monitoring; D056890:Eukaryota / Q000502:physiology*; D014873:Water Pollutants / Q000009:adverse effects*
chemical_list: D014873:Water Pollutants