Table 1.

Mean values of the frequency of the mitotic indices of the meristems of A. cepa submitted to treatment with different concentrations of R. mangle bark aqueous extract.

Samples	Mitotic index (x)	Root length (mm)
Negative control	0.029	12.50
Extract 28.0 g/L	0.000	2.0
Extract 14.0 g/L	0.003	7.5
Extract 7.00 g/L	0.023	9.0
Extract 3.50 g/L	0.036	10.0
Extract 1.75 g/L	0.041*	17.0

*Statistically significant difference by the Kruskal-Wallis test for the mean root length, in relation to extract concentration 28.0 g/L.