title: Differential physiological responses of two Salvinia species to hexavalent chromium at a glance.
abstract: In plants of Salvinia rotundifolia and Salvinia minima the effect of two Cr(VI) concentrations (5 and 20mgL(-1)) applied for 7days was assessed by measuring changes in biomass, photosynthetic pigments, Cr accumulation, malondialdehyde (MDA), membrane stability index (MSI), thiols (TT, NPT and PBT), and phenolics (SP and IP). Biomass in S. minima was decreased at highest Cr(VI) concentration, but there were no changes in S. rotundifolia. Metal accumulation was different in both species. S. minima accumulates more metal in fronds, but S. rotundifolia accumulates more metal in lacinias. Results also showed that S. minima translocates more Cr to fronds than S. rotundifolia, but at the whole plant level higher accumulation occurred in this last. Tolerance index (Ti) was higher in S. rotundifolia. Chl b and carotenoids were decreased only upon exposure to high Cr(VI) concentration in both species. Cr(VI) treatment did not enhance MDA accumulation. Cr exposure had no impact on MSI values when comparing with Cr-untreated values. Thiols in fronds and lacinias showed different distribution patterns between species. IP and NPT were higher in S. rotundifolia lacinias that accumulate more Cr than S. minima lacinias. Whilst SP and NPT were higher in S. minima fronds compared with S. rotundifolia ones. This may indicate that these species can cope with Cr(VI) toxicity, either through metal complexation and/or metal reduction or by the scavenging of ROS derived from Cr-induced oxidative stress. Based on Cr accumulation and biomass production, S. rotundifolia seems more suitable to remove Cr(VI) from polluted waters.
authors.affiliation: Cátedra de Fisiología Vegetal, Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, Miguel Lillo 205, CP 4000 San Miguel de Tucumán, Argentina.
authors.forename: Carolina
authors.initials: C
authors.lastname: Prado
authors.affiliation: Cátedra de Fisiología Vegetal, Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, Miguel Lillo 205, CP 4000 San Miguel de Tucumán, Argentina.
authors.forename: Silvana
authors.initials: S
authors.lastname: Chocobar Ponce
authors.affiliation: Departamento de Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, CP 1417 Buenos Aires, Argentina.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Pagano
authors.affiliation: Cátedra de Fisiología Vegetal, Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, Miguel Lillo 205, CP 4000 San Miguel de Tucumán, Argentina. Electronic address: pra@tucbbs.com.ar.
authors.forename: Fernando E
authors.initials: FE
authors.lastname: Prado
authors.affiliation: Cátedra de Fisiología Vegetal, Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, Miguel Lillo 205, CP 4000 San Miguel de Tucumán, Argentina.
authors.forename: Mariana
authors.initials: M
authors.lastname: Rosa
mesh_terms: D018533:Biomass; D002857:Chromium / Q000633:toxicity*; D029624:Ferns / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects*; D010636:Phenols / Q000032:analysis; D010788:Photosynthesis / Q000187:drug effects*; D013438:Sulfhydryl Compounds / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D010636:Phenols; D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D008315:Malondialdehyde
keywords: Chromium accumulation; Phenolics; Salvinia species; Thiols; Tolerance