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| Hassan,AMA; Mostafa,EM. |
| Plants of Azolla caroliniana were treated with different selenium concentrations (0, 1, 2, 5, 7, 10 ppm) for seven days. Selenium (Se) content in Azolla plants increased significantly with increasing Se concentrations in the culture media up to 5 ppm. This indicated that Azolla plants were a good accumulator for Se. Selenium accumulation determined changes in Azolla biomass, doubling time and relative growth rates. Treatment of Azolla plants with low concentrations of Se (1 ppm) resulted in a significant increase in biomass. This was accompanied by a reduction in hydrogen peroxide and malondialdehyde (MDA) contents; the decrease percentages were 78% and 60%, respectively at 1 ppm Se in comparison with the control. At higher Se concentrations (>5 ppm),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selenium; Azolla caroliniana; Ascorbate; Glutathione; Antioxidant enzymes; Glutathione peroxidase. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200014 |
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| Guimarães,F.P; Aguiar,R; Karam,D; Oliveira,J.A; Silva,J.A.A; Santos,C.L; Sant'anna-Santos,B.F; Lizieri-Santos,C. |
| The potential of three macrophytes, Azolla caroliniana, Salvinia minima, and Lemna gibba was assessed in this study to select plants for use in environmental remediation contaminated with atrazine. Experiments were carried out in a greenhouse over six days in pots containing Hoagland 0.25 strength nutritive solution at the following atrazine concentrations: 0; 0.01; 0.1; 1.0; 10.0 mg L-1. Decrease in biomass accumulation was observed in the three macrophytes, as well as toxic effects evidenced by the symptomatology developed by the plants which caused their deaths. The chlorosis and necrosis allowed to observe in the plants the high sensitivity of the three species to the herbicide. Plants presented low potential for removal of atrazine in solution when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Azolla caroliniana; Salvinia minima; Lemna gibba; Herbicide; Bioremediation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000500022 |
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| Adalberto,Paulo R.; Massabni,Antonio C.; Goulart,Antonio J.; Monti,Rubens; Lacava,Pedro M.. |
| O bioacúmulo de minerais, a fixação de nitrogênio e a concentração de pigmentos em Azolla caroliniana foram estabelecidos sob estresse nutritivo. As culturas foram mantidas em frascos de poliestireno, utilizando gradiente de fosfato entre 10-7 e 10-3 mol.L-1. Os minerais (P, S, B e Sn) foram quantificados por espectrometria de emissão ótica com plasma de acoplamento induzido e o teor de nitrogênio pelo método de Kjeldahl. A atividade da nitrogenase foi determinada pela reação de redução do acetileno e as concentrações de pigmentos foram determinadas por fotometria nos extratos metanólicos acidificados. A absorção de macronutrientes (N, P, S) mostrou-se relacionada ao suprimento de fósforo, enquanto a absorção de micronutrientes (B e Sn) não sofreu este... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antocianina; Azolla caroliniana; Bioacumulação de minerais; Nitrogenase. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300017 |
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