Mixture of Toxic Metals and Volatile Organic Compounds in a River Induces Cytotoxicity

Table 3

Effect of Atoyac River water on mitotic index and phase indices in meristems of A. cepa after 120 hours of exposure.

Zone	Group	MI (M ± SD)	% Phase index (M ± SD)
			PI	MeI	AI	TI
Z1	C	54.3 ± 0.5^a	91.5 ± 1.4^a	3.5 ± 0.4^a	3.1 ± 0.4^a	2.0 ± 0.6^a
	25%	53.6 ± 0.9^a	91.1 ± 0.5^a	3.9 ± 0.2^a	3.4 ± 0.4^a	1.7 ± 0.3^a
	50%	51.6 ± 0.9^a	91.5 ± 1.3^a	4.1 ± 0.2^a	2.7 ± 0.8^a	1.8 ± 0.4^a
	100%	54.3 ± 1.1^a	93.1 ± 2.1^a	2.7 ± 0.7^a	2.6 ± 0.7^a	1.5 ± 0.8^a
Z2	C	53.8 ± 0.5^a	92.2 ± 1.5^a	3.1 ± 0.3^a	2.9 ± 0.7^a	1.8 ± 0.6^a
	25%	54.3 ± 0.2^a	91.7 ± 1.7^a	3.4 ± 0.1^a	2.3 ± 0.4^a	1.9 ± 0.3^a
	50%	46.5 ± 1.4^b	94.2 ± 1.3^a	2.2 ± 0.2^b	2.1 ± 0.7^a	1.5 ± 0.4^a
	100%	42.0 ± 0.7^c	96.3 ± 0.5^b	1.5 ± 0.3^b	1.6 ± 0.2^a	0.6 ± 0.4^a
Z3	C	54.1 ± 0.3^a	93.6 ± 0.4^a	3.1 ± 0.3^a	1.9 ± 0.2^a	1.4 ± 0.2^a
	25%	43.8 ± 0.7^b	95.0 ± 0.6^a	2.3 ± 0.2^a	1.7 ± 0.3^a	1.1 ± 0.2^a
	50%	41.6 ± 0.8^c	96.0 ± 1.2^b	1.4 ± 0.4^b	1.7 ± 0.2^a	1.0 ± 0.6^a
	100%	0.0 ± 0	0.0 ± 0	0.0 ± 0	0.0 ± 0	0.0 ± 0

C: concentration; MI: mitotic index; PI: prophase index; MeI: metaphase index; AI: anaphase index; TI: telophase index; M: mean value; SD: standard deviation; Z1: study zone 1; Z2: study zone 2; Z3: study zone 3. Different literals (a, b, and c) indicate there is a significant difference between study zones ( < 0.05). The 100% treatment in Z3 did not show root development.