title: Combined effects of elevated CO2 and Cd-contaminated water on growth, photosynthetic response, Cd accumulation and thiolic components status in Lemna minor L.
abstract: The objective of this study was to investigate the combined effects of elevated CO2 and cadmium (Cd) treatments on growth, photosynthetic efficiency and phytoremediation ability in Lemna minor L. Plants of L. minor were exposed to different Cd concentrations (0, 1.5, 2.5 and 5 mg L(-1) Cd) for periods of 24, 48 and 72 h at ambient (AC) and at elevated (EC) CO2 (350 and 700 ppm, respectively). Cadmium concentration, bioconcentration factor, enzyme activities and thiols content enhanced in plants with the increase of Cd treatments, time of exposure and at both CO2 levels. Glutathione levels increased only at AC. Growth, photosynthetic and chlorophyll fluorescence parameters, and the reduced glutathione to oxidized glutathione ratio declined in plants with increasing exposure time, Cd treatments and at both CO2 levels. Our results suggested that the alleviation of toxicity, at low Cd doses, observed in L. minor grown at EC is dependent on both increased photosynthesis and an enhanced antioxidant capacity.
authors.affiliation: Institute of Agro-Environmental and Forest Biology, National Research Council of Italy, Via Salaria Km 29,300, 00015 Monterotondo Scalo, Roma, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Pietrini
authors.affiliation: Institute of Agro-Environmental and Forest Biology, National Research Council of Italy, Via Salaria Km 29,300, 00015 Monterotondo Scalo, Roma, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Bianconi
authors.affiliation: Institute of Agro-Environmental and Forest Biology, National Research Council of Italy, Via Salaria Km 29,300, 00015 Monterotondo Scalo, Roma, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Massacci
authors.affiliation: Institute of Agricultural Biology and Biotechnology, National Research Council of Italy, Via Salaria Km 29,300, 00015 Monterotondo Scalo, Roma, Italy. Electronic address: adelaide.iannelli@ibba.cnr.it.
authors.forename: M A
authors.initials: MA
authors.lastname: Iannelli
mesh_terms: D029064:Araceae / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D001673:Biodegradation, Environmental / Q000187:drug effects; D002104:Cadmium / Q000493:pharmacokinetics / Q000494:pharmacology*; D002245:Carbon Dioxide / Q000494:pharmacology*; D002734:Chlorophyll / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D013438:Sulfhydryl Compounds / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics / Q000494:pharmacology*
chemical_list: D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002734:Chlorophyll; D002245:Carbon Dioxide; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D005978:Glutathione
keywords: Chlorophyll fluorescence; Duckweed; Glutathione; Heavy metals; Phytoremediation