Data/hora: 10/06/2024 10:14:11

Provedor de dados: | 61
País: | Brazil
Título: | Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg
Autores: | Caldelas,Cristina; Iglesia-Turiño,Santiago; Araus,Jose L.; Bort,Jordi; Febrero,Anna.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Abiotic stress; Metal accumulation; Multiple stress; Phytoremediation; Water eutrophication; Water pollution.
Resumo: | In the present study the physiological response of water hyacinth (Eichhornia crassipes [Mart.] Solms) to the combined exposure of excess nutrients and Hg was examined. Young water hyacinth plants were exposed to a range of HgCl2 and KNO3 concentrations. After eight weeks, submerged plant tissues reached an Hg concentration of 4 mg g-1. The accumulation of P and S was reduced by the addition of HgCl2, and also the P and K concentrations in emerged and submerged parts decreased. In contrast, the addition of HgCl2 increased Ca and Mg concentrations in submerged parts. Furthermore, the concentration ratios of submerged/emerged parts for Ca, Mg and P were also reduced by the addition of HgCl2. The interaction of HgCl2 and KNO3 was synergistic and decreased Fv/Fm, total chlorophyll content and P and Mn concentrations in emerged parts. In submerged plant parts Ca concentration increased and K content stabilized as a result of the above interaction. However, the total accumulation of Hg per plant was not reduced, thereby confirming the water hyacinth as a promising candidate for the heavy metal phytoremediation of eutrophic waters.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100002
Editor: | Brazilian Journal of Plant Physiology
Relação: | 10.1590/S1677-04202009000100002
Formato: | text/html
Fonte: | Brazilian Journal of Plant Physiology  v.21 n.1 2009
Fonte: | info:eu-repo/semantics/openAccess