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	Provedor de dados Braz. J. Plant Physiol. (2) Autor Dubey,Rama Shanker (1) Inouhe,Masahiro (1) Sharma,Pallavi (1) Palavra-chave Phytochelatin (2) Phytoremediation (2) Antioxidant defense system (1) Arsenic (1) Cadmium-binding peptides (1) Detoxification (1) Heavy metal-tolerance (1) Lead (1) Osmolytes (1) Rhizofiltration (1) Tolerance (1) Toxicity (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2005 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Lead toxicity in plants Braz. J. Plant Physiol. Sharma,Pallavi; Dubey,Rama Shanker. Contamination of soils by heavy metals is of widespread occurrence as a result of human, agricultural and industrial activities. Among heavy metals, lead is a potential pollutant that readily accumulates in soils and sediments. Although lead is not an essential element for plants, it gets easily absorbed and accumulated in different plant parts. Uptake of Pb in plants is regulated by pH, particle size and cation exchange capacity of the soils as well as by root exudation and other physico-chemical parameters. Excess Pb causes a number of toxicity symptoms in plants e.g. stunted growth, chlorosis and blackening of root system. Pb inhibits photosynthesis, upsets mineral nutrition and water balance, changes hormonal status and affects membrane structure and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant defense system; Detoxification; Lead; Osmolytes; Toxicity; Phytochelatin; Phytoremediation; Rhizofiltration; Tolerance. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100004 Phytochelatins Braz. J. Plant Physiol. Inouhe,Masahiro. Phytochelatins (PCs) were first discovered as Cd-binding "Cadystins A and B" in a fission yeast and then in many plants as the major components of Cd-binding complexes. PCs have the general structure of (gamma-glutamyl-cysteinyl)n-glycine (n=2-11) and the variants with the repeated gamma-glutamyl-cysteinyl units are formed in some plants and yeast. They are capable of binding to various metals including Cd, Cu, Zn or As via the sulfhydryl and carboxyl residues, but their biosyntheses are controlled preferentially by the metal Cd or metalloid As. PCs are synthesized from glutathione (gamma-glutamyl-cysteinyl-glycine) in steps mediated by PC synthase. Genes (CAD1, PCS1) of the enzyme have been isolated from plants, fission yeast and some animals. Inhibition... Tipo: Info:eu-repo/semantics/article Palavras-chave: Arsenic; Cadmium-binding peptides; Heavy metal-tolerance; Phytochelatin; Phytoremediation. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100006 Registros recuperados: 2 Primeira ... 1 ... Última

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