Effect of excess iron and copper on physiology of aquatic plant Spirodela polyrrhiza (L.) Schleid

Abstract

To elucidate effect of chemical reagents addition on growth of aquatic plants in restoration of aquatic ecosystem, Spirodela polyrrhiza (L.) Schleid was used to evaluate its physiological responses to excess iron (Fe 31 ) and copper (Cu 21 ) in the study. Results showed that accumulation of iron and copper both reached maximum at 100 mg L 21 iron or copper after 24 h short-term stress, but excess iron and copper caused plants necrosis or death and colonies disintegration as well as roots abscission at excess metal concentrations except for 1 mg L 21 iron. Significant differences in chlorophyll fluorescence (Fv/Fm) were observed at 1-100 mg L 21 iron or copper. The synthesis of chlorophyll and protein as well as carbohydrate and the uptake of phosphate and nitrogen were inhibited seriously by excess iron and copper. Proline content decreased with increasing iron or copper concentration, however, MDA content increased with increasing iron or copper concentration. # 2009 Wiley Periodicals, Inc. Environ Toxicol 25: 103-112, 2010.

Copper Removal Efficiency in a Surface Water and Compartmentalization in the Floating Fern Salvinia minima

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Antioxidative responses of Elodea nuttallii (Planch.) H. St. John to short-term iron exposure

“…Leaf chlorophyll fluorescence was measured using a Plant Efficiency Analyzer (PEA, Hansatech Instruments Ltd., England), by which the maximum photochemical efficiency of PSII (Fv/Fm), the activity of PSII (Fv/Fo) and electron transport rate (ETR) through PSII (Fm/Fo) were obtained [39].…”

Paclobutrazol and plant-growth promoting bacterial endophyte Pantoea sp. enhance copper tolerance of guinea grass (Panicum maximum) in hydroponic culture

“…A concentration of Cu in soils, that exceeding the maximum allowable concentration that required as nutrients or background levels, results in an accumulation of Cu in plants on deleterious levels (Srivastava et al 2008). Excess copper could seriously inhibit the synthesis of chlorophyll and protein as well as carbohydrate and the uptake of phosphate and nitrogen (Xing et al 2010). An important feature of copper toxicity is the formation of damaging oxygen radicals, and then causes increasing of MDA and proline contents, electrical conductivity and antioxidant enzyme activities (SOD, CAT, APX) (Li et al 2009a).…”