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Accumulation, tolerance and impact of aluminium, copper and zinc on growth and nitrate reductase activity of Ceratophyllum demersum (Hornwort).
J Environ Biol ; 2008 Mar; 29(2): 197-200
Artigo em Inglês | IMSEAR | ID: sea-113600
ABSTRACT
Ceratophyllum demersum (homwort) was subjected to toxic concentrations of Al (3 and 9 mg l(-1)), Zn (3 and 9 mg l(-1)) and Cu (2.5 and 7 mg l(-1)) in culture solutions for 15 days. The higher dose of Al enhanced the chlorophyll content significantly (p<0.05) in the first 6 days of treatment while other treatments caused marked reductions. Nitrate reductase activity (NRA) was significantly reduced (p<0.05) byAl, Cu and Zn toxicity and ceased completely in plants treated with Cu by the 6th day of treatment. Dry biomass and relative growth rate were reduced significantly (p<0.05) by metal treatment. Tolerance index of the plant was low for Cu (21.62 and 13.43% at low and high doses, respectively) and moderate for Zn (63.74 and 54.85%) and Al (72.83 and 68.79%). Accumulation ofAl, Zn and Cu was threefold at higher doses compared with the lower doses but the bioconcentration factors (BCF) were very low indicating that this plant is not a hyper accumulator of these metals.
Assuntos
Texto completo: DisponíveL Índice: IMSEAR (Sudeste Asiático) Assunto principal: Fatores de Tempo / Poluentes Químicos da Água / Zinco / Clorofila / Cobre / Magnoliopsida / Relação Dose-Resposta a Droga / Tolerância a Medicamentos / Exposição Ambiental / Nitrato Redutase Idioma: Inglês Revista: J Environ Biol Ano de publicação: 2008 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: IMSEAR (Sudeste Asiático) Assunto principal: Fatores de Tempo / Poluentes Químicos da Água / Zinco / Clorofila / Cobre / Magnoliopsida / Relação Dose-Resposta a Droga / Tolerância a Medicamentos / Exposição Ambiental / Nitrato Redutase Idioma: Inglês Revista: J Environ Biol Ano de publicação: 2008 Tipo de documento: Artigo