title: Effect of phosphorus on arsenic uptake and metabolism in rice cultivars differing in phosphorus use efficiency and response.
abstract: A hydroponic experiment was carried out to investigate the effect of phosphorus (P) nutrition on arsenic (As) uptake and translocation within the seedlings of rice cultivars. The experiment occurred in three stages: I 5 days of acclimatization (nutritive solution); II 10 days under P (0.0 and 0.09 mM) and As (0.0 and 100 mM) treatments; III 5 days under recovery. The As exposure had significant effect reducing dry weights of shoots or roots, resulted in elevated concentrations of As in shoot tissues. BR-IRGA 409 showed the highest susceptibility to As in biomass production and root system parameters regardless the P level. This cultivar showed contrasting responses of As translocation to shoot tissue dependent on P levels, with the highest As concentration under low P and lowest under normal P levels. P nutrition was most striking on plants recovery for all cultivars under As exposure. Clearer separation of cultivars for phosphorus use efficiency (PUE) occurred at lower shoot P contents, that was, at higher levels of P deficiency stress. IRGA 424 showed higher PUE as compared to the others cultivars. Our results go some way to understanding the role of P nutrition in controlling the effects of As in rice shoots.
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.|Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast, BT9 5BN, Northern Ireland.
authors.forename: Júlia G
authors.initials: JG
authors.lastname: Farias
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Katieli
authors.initials: K
authors.lastname: Bernardy
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Raíssa
authors.initials: R
authors.lastname: Schwalbert
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Bianca K
authors.initials: BK
authors.lastname: Del Frari
authors.affiliation: Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast, BT9 5BN, Northern Ireland.
authors.forename: Andrew
authors.initials: A
authors.lastname: Meharg
authors.affiliation: Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast, BT9 5BN, Northern Ireland.
authors.forename: Manus
authors.initials: M
authors.lastname: Carey
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Anderson C R
authors.initials: ACR
authors.lastname: Marques
authors.affiliation: Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast, BT9 5BN, Northern Ireland.
authors.forename: Antonio
authors.initials: A
authors.lastname: Signes-Pastor
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Darlene
authors.initials: D
authors.lastname: Sausen
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Márcio R W
authors.initials: MRW
authors.lastname: Schorr
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Mirian S
authors.initials: MS
authors.lastname: Tavares
authors.affiliation: 1Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Fernando T
authors.initials: FT
authors.lastname: Nicoloso
mesh_terms: D001151:Arsenic / Q000032:analysis / Q000493:pharmacokinetics*; D001692:Biological Transport; D018533:Biomass; D005308:Fertilizers; D018527:Hydroponics / Q000379:methods; D012275:Oryza / Q000187:drug effects* / Q000378:metabolism*; D010758:Phosphorus / Q000032:analysis / Q000494:pharmacology*; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D012016:Reference Values; D015203:Reproducibility of Results; D012639:Seeds / Q000187:drug effects / Q000378:metabolism; D013997:Time Factors
chemical_list: D005308:Fertilizers; D010758:Phosphorus; D001151:Arsenic