Table 1.

Effect of different concentrations and treatment duration of colchicine on polyploidy induction (mean ± standard error) in P. cablin (all data are in percentages)

Colchicine concentration (%)	Duration (exposure) time (h)	Treatment number	Survival number	Variation number	Variation rates (%)
					Of initial buds	Of survival buds
0.05	12	40	84	14	34.89 ± 1.35	16.36 ± 1.29
	24	40	71	21	52.45 ± 2.43	29.43 ± 0.92
	36	40	68	24	60.32 ± 2.89	33.94 ± 3.01
	48	40	65	24	59.56 ± 2.51	36.92 ± 1.02
	60	40	70	30	75.64 ± 2.78	41.27 ± 1.37
	72	40	61	34	85.65 ± 1.1	54.73 ± 2.13
	84	40	54	21	52.53 ± 2.01	38.89 ± 1.32
0.1	12	40	57	19	47.59 ± 3.92	33.33 ± 3.19
	24	40	42	16	40.32 ± 4.02	38.09 ± 3.89
	36	40	37	19	47.57 ± 4.62	51.35 ± 4.58
	48	40	45	22	55.68 ± 3.85	48.88 ± 3.58
	60	40	49	24	60.56 ± 5.01	48.97 ± 4.97
	72	40	35	20	50.56 ± 4.53	57.14 ± 4.62
	84	40	29	15	37.52 ± 3.59	51.72 ± 3.57
0.2	12	40	45	20	50.35 ± 4.69	43.44 ± 5.09
	24	40	35	17	42.54 ± 4.82	46.57 ± 5.01
	36	40	35	21	52.55 ± 3.78	60.75 ± 3.27
	48	40	31	20	50.29 ± 5.96	65.51 ± 4.91
	60	40	29	13	32.54 ± 4.82	42.82 ± 5.14
	72	40	23	12	30.19 ± 4.27	52.31 ± 4.78
	84	40	21	11	27.45 ± 4.87	52.38 ± 3.69

^aInduction on MS solid medium, and the seedlings transplanted in soil for 6 months.

^bThe seedlings both from the lateral buds and the cluster buds were in the statistical range.