ResumoNeste estudo, avaliou-se a ação do suco de noni sobre as células meristemáticas de raízes de Allium cepa, em duas concentrações, 0,18 e 0,36 mg/mL, com os tempos de exposição de 24 e 48 h. Para cada concentração se utilizou um grupo de 5 bulbos de cebolas, que primeiramente foram inseridos em água destilada e, em seguida, transferidos para suas respectivas concentrações. As radículas foram coletadas e ixadas em ácido acético (3:1) por 24 h. As lâminas foram preparadas pela técnica de esmagamento, e coradas com orceína acética a 2%. Foram analisadas células em todo ciclo celular, totalizando 5.000 para cada controle e tempo de exposição. Os índices mitóticos calculados foram submetidos à análise estatística de qui-quadrado (p < 0,05). Veriicou-se que ambas as concentrações, inclusive a menor, considerada ideal para consumo, aumentou de forma signiicativa o índice mitótico das células meristemáticas de raízes de cebola. Portanto, nas condições analisadas, ambas as concentrações testadas do suco de noni promoveram alteração na divisão celular desse sistema-teste vegetal.Palavras-chave: Divisão celular; Noni; Planta medicinal; Raízes de Allium cepa AbstractAction of the juice from the fruit of Morinda citrifolia L. on cells of the plant test system. In this study, we evaluated the action of noni juice on the meristematic cells of Allium cepa roots, at two concentrations, 0.18 and 0.36 mg/mL, with the exposure times of 24 and 48 h. For each concentration, we used a group of 5 onion bulbs, which were irst embedded in distilled water and, then, transferred to their respective concentrations. The radicles were collected and ixed in acetic acid (3:1) for 24 hours. The root tips were collected and ixed in acetic acid (3:1) for 24 h. The slides were prepared through the crushing technique, and stained with 2% acetic orcein. Cells were analyzed throughout the cell cycle, totaling 5,000 for each control and exposure time. The mitotic indices calculated underwent chi-square (p < 0.5) statistical analysis. We found out that both concentrations, including the lowest, regarded as ideal for consumption, signiicantly increased the mitotic index of meristematic cells of onion roots. Therefore, under the analyzed conditions, both tested concentrations of noni juice have promoted change in the cell division of this plant test system.
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