Table 5 Chromosomal aberrations observed in Allium cepa roots cells treated with different concentrations of atrazine and sodium azide.

Sample code	Conc µg/mL	TC	TDC	NC	Physiological aberrations (PA)							Clastogenic aberrations(CA)							MI
					Cm	St	Vg	Lg	Da	TPA		Cf	Cb	Ck	TCA		TPA + TCA
					Cm	St	Vg	Lg	Da	No.	%	Cf	Cb	Ck	No.	%	No.	%
NC		3000	1713	1700	1	3	2	1	4	11	0.64	–	1	1	2	0.11	13	0.79 ± 0.25^a	57.10 ± 11.09^b
ATZ	1	3000	1434	1017	56	65	20	37	39	217	15.13	78	83	39	200	13.94	417	29.11 ± 2.41^ab	47.83 ± 4.93^ab
	5	3000	955	530	63	58	29	15	33	198	20.73	93	78	56	227	23.76	425	44.83 ± 10.40^bc	31.83 ± 7.10^a
	10	3000	915	265	119	104	49	68	84	424	46.33	85	69	72	226	24.69	650	71.35 ± 6.56^c	30.50 ± 2.27^a
SA	1	3000	1023	565	70	35	29	39	37	210	20.52	96	87	65	248	24.24	458	44.78 ± 16.44^bc	34.10 ± 10.69^ab
	5	3000	1057	578	83	52	28	38	53	254	24.03	78	81	66	225	21.28	479	45.86 ± 7.74^bc	35.23 ± 4.43^a
	10	3000	1011	618	55	67	32	21	37	212	20.96	69	65	47	181	17.90	393	38.87 ± 18.65^b	33.70 ± 9.90^a

NC negative control, ATZ atrazine, SA sodium azide, TC total cells, TDC total dividing cells, NC normal cells, Cm C-mitosis, St stickiness, Vg vagrant, Lg laggard, Da delayed anaphase, Cf chromosome fragments, Cb chromosome bridge, Ck chromosome break, TPA total physiological aberration, TCA total clastogenic aberrations, MI mitotic index. Data are mean ± SD of three replicates. Different alphabets (a, b and c) are significantly different at (p < 0.05), as determined by Tukey HSD test.

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