Data/hora: 08/06/2024 17:39:39

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Lead tolerance of water hyacinth (Eichhornia crassipes Mart. - Pontederiaceae) as defined by anatomical and physiological traits	
Autores: 	PEREIRA,FABRICIO J.; CASTRO,EVARISTO M. DE; OLIVEIRA,CYNTHIA DE; PIRES,MARINÊS F.; PEREIRA,MARCIO P.; RAMOS,SILVIO J.; FAQUIN,VALDEMAR.	
Data: 	2014-09-01	
Ano: 	2014	
Palavras-chave: 	Heavy metals; Ecophysiology; Plant anatomy; Macrophytes.	
Resumo: 	This study aimed at verifying the lead tolerance of water hyacinth and at looking at consequent anatomical and physiological modifications. Water hyacinth plants were grown on nutrient solutions with five different lead concentrations: 0.00, 0.50, 1.00, 2.00 and 4.00 mg L–1 by 20 days. Photosynthesis, transpiration, stomatal conductance and the Ci/Ca rate were measured at the end of 15 days of experiment. At the end of the experiment, the anatomical modifications in the roots and leaves, and the activity of antioxidant system enzymes, were evaluated. Photosynthetic and Ci/Ca rates were both increased under all lead treatments. Leaf anatomy did not exhibit any evidence of toxicity effects, but showed modifications of the stomata and in the thickness of the palisade and spongy parenchyma in the presence of lead. Likewise, root anatomy did not exhibit any toxicity effects, but the xylem and phloem exhibited favorable modifications as well as increased apoplastic barriers. All antioxidant system enzymes exhibited increased activity in the leaves, and some modifications in roots, in the presence of lead. It is likely, therefore, that water hyacinth tolerance to lead is related to anatomical and physiological modifications such as increased photosynthesis and enhanced anatomical capacity for CO2 assimilation and water conductance.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301423	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/0001-3765201420140079	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.86 n.3 2014	
Fonte: 	info:eu-repo/semantics/openAccess