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Efeitos do Cromo Hexavalente Sobre o Crescimento de Raízes e Ciclo Celular no Meristema da Ponta da Raiz de Allium cepa

2016; UNIVERSIDADE FEDERAL DO AMAPÁ; Volume: 6; Issue: 3 Linguagem: Inglês

10.18561/2179-5746/biotaamazonia.v6n3p40-44

ISSN

2179-5746

Autores

Mary Helen Pestana da Costa, Priscila Cordeiro Costa da Silva, Carlos Alberto Machado da Rocha,

Tópico(s)

Chromium effects and bioremediation

Resumo

The International Agency Research on Cancer (IARC) classifies the hexavalent chromium [Cr (VI)] as carcinogenic to humans. The major source of environmental contamination by chromium in aquatic ecosystems is related to industrial application of this metal. In this study, we evaluated the cytotoxic and genotoxic effects of Cr (VI) in cell cycle meristem of Allium cepa root. The test was used to evaluate the effects of chromium on seed germination, root elongation, mitotic index and the induction of micronuclei and anomalies of the mitotic cycle. Allium cepa seeds were germinated in five different conditions: (1) negative control, distilled water; (2) test group T1, treated with potassium dichromate 6 mg.L -1 ; (3) test group T2, treated with potassium dichromate 12 mg.L -1 ; (4) test group T3, treated with potassium dichromate 24 mg.L -1 ; (5) positive control, treated with NMU (N-nitroso-N-methylurea) 0,125 mg.L -1 . The statistical analyses used were ANOVA and Pearson's correlation coefficient. Though without affecting the seed germination rate and elongation of roots, the results demonstrated cytotoxic effects on the mitotic index, as well as genotoxic effects of hexavalent chromium. Keywords : Chromium; Allium cepa ; cell cycle; cytotoxicity; genotoxicity.

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