Absorção de nutrientes por mudas de ipê-roxo (Tabebuia impetiginosa (Mart.) Standl.) em solução nutritiva contaminada por cádmio Nutrients absorption by seedlings of ipê-roxo (Tabebuia impetiginosa (Mart.) Standl.) in nutrient solution contaminated by cadmium
2004
Haroldo Nogueira de Paiva | Janice Guedes de Carvalho | José Oswaldo Siqueira | José Romilson Paes de Miranda | Antônio Rodrigues Fernandes
Mudas de ipê-roxo, conduzidas em solução nutritiva de Clark, foram submetidas a doses crescentes de Cd: 0, 22, 44, 88 e 132 µmol/l, em delineamento de blocos ao acaso, por um período de 60 dias. Foram avaliados os teores e os conteúdos de Cd, de macro e de micronutrientes, na raiz, no caule e nas folhas. Os resultados mostraram que na raiz ocorreu redução no teor dos macronutrientes, enquanto nas folhas não houve efeito significativo. O teor radicular de Cu, Fe e Mn aumentou e o de Zn diminuiu na presença de Cd. O conteúdo radicular de macronutrientes diminuiu com a aplicação de Cd, ao passo que os conteúdos caulinar e foliar não foram afetados. O teor e o conteúdo de Cd nas diferentes partes das mudas foram crescentes em função da dose do metal pesado.<br>Seedlings of Tabebuia impetiginosa cultivated in Clark nutrient solution were submitted to the following Cd levels: 0, 22, 44, 88 and 132 µmol/l, arranged in a randomized block design for 60 days. The plants were picked up and separated into root, stem and leaf, which were analyzed regarding Cd, macro, and micronutrient content and accumulation. The results showed that the macronutrient content of the root was reduced, while that of the leaves did not have a significant effect. The Cu, Fe, and Mn contents of the root increased and the Zn content decreased. Root macronutrient accumulation reduced and leaf accumulation was not affected. The Cd content and accumulation in the different parts of the seedlings increased with the heavy metal dose.
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