Table 4.

Effects of the elicitors chitosan and salicylic acid (SA) on in vitro callus growth under darkness + 2,4-D and light + 6-BA.

Elicitors 1	0.5 mg/L 2,4-D + Darkness		2.0 mg/L BA + Light
	Diameter (cm) Mean ± SD	Fresh Weight (g/callus) Mean ± SD	Fresh Weight (g/callus) Mean ± SD
Control	0.50 ± 0.24 a	1.51 ± 0.45 a	1.78 ± 0.41 a
Salicylic acid	0.35 ± 0.38 a	0.90 ± 0.38 c	1.83 ± 0.33 a
Chitosan	0.40 ± 0.44 a	1.31 ± 0.36 b	1.77 ± 0.48 a
F 1	0.33 ns	24.59 **	0.07 ns
CV (%)	13.17	15.89	21.16

¹ Each mean represents 10 replicates (test tube) with one nodal segment each. Means within a column followed by the different letters are significantly different according to the Scot-Knott test at the 1% (**) level of probability. All data followed a normal distribution according to the Shapiro–Wilk test. F = distribution of variances according the F test; CV = coefficient of variation; SD = standard deviation of means; ns = not significant.