Allium cepa Bio Assay to Assess the Water and Sediment Cytogenotoxicity in a Tropical Stream Subjected to Multiple Point and Nonpoint Source Pollutants

Table 5

Mean mitotic index of root tip cells of Allium cepa bulbs following exposure to water and sediment elutriates collected from study sites. Data are represented as mean ± SD. Results indicated by different superscript letters in each column are significantly different from each other (ANOVA, Tukey’s test, p < 0.05, n=10).

Site	Mitotic index (%)
	Water	Sediment elutriate
A	5.4 ± 0.	4.2 ± 1.
B	5.4 ± 1.	6.1 ± 0.
C	1.8 ± 0.	2.9 ± 0.
D	3.1 ± 0.	3.4 ± 0.
E	5.2 ± 0.	3.4 ± 0.
F	6.0 ± 0.	7.4 ± 1.