title: 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(3+)) and copper (Cu(2+)) in the study. Results showed that accumulation of iron and copper both reached maximum at 100 mg L(-1) 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(-1) iron. Significant differences in chlorophyll fluorescence (Fv/Fm) were observed at 1-100 mg L(-1) 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.
authors.affiliation: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan 430074, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.forename: Wenmin
authors.initials: W
authors.lastname: Huang
authors.forename: Guihua
authors.initials: G
authors.lastname: Liu
mesh_terms: D029064:Araceae / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D050260:Carbohydrate Metabolism; D002734:Chlorophyll / Q000378:metabolism; D003300:Copper / Q000633:toxicity*; D007501:Iron / Q000633:toxicity*; D008315:Malondialdehyde / Q000378:metabolism; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D010940:Plant Proteins / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D009566:Nitrates; D010710:Phosphates; D010940:Plant Proteins; D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D010758:Phosphorus; D008315:Malondialdehyde; D003300:Copper; D011392:Proline; D007501:Iron; D009584:Nitrogen