Table 2. Effects of natural auxins and synthesized auxin derivatives on lettuce hypocotyl and root lengths.

Entry	Compound	Concentration (ppm)	Hypocotyl elongation	Root elongation
1	IAA	0.5	0.54	0.28
2		5	0.52	0.16
3		50	0.59	0.13
4	NAA	0.5	0.39	0.13
5		5	0.52	0.13
6		50	0.26	0.08
7	2,4-D	0.5	0.2	0.12
8		5	0.2	0.08
9		50	0.13	0.08
10	IBA	0.5	0.54	0.42
11		5	0.52	0.15
12		50	0.46	0.11
13	CF3-IAA	0.5	1.25	1.15
14		5	0.83	0.62
15		50	0.38	0.37
16	4-Cl-CF3-IAA	0.5	1.13	1.21
17		5	0.52	0.82
18		50	0.12	0.09
19	CF3-NAA	0.5	1.19	1.26
20		5	1.05	0.90
21		50	0.17	0.16
22	CF3-2,4-D	0.5	1.29	1.35
23		5	1.24	1.18
24		50	0.44	0.33
25	CF3-IBA-1	0.5	1.15	2.01
26		5	0.98	1.51
27		50	0.31	0.81
28	CF3-IBA-2	0.5	1.35	1.27
29		5	1.37	1.51
30		50	1.05	1.85

^a Hypocotyl and root elongation are presented as relative ratios to the control (water). Values represent the means of at least three independent experiments. In the control sample, hypocotyl height and root length are 12 and 10 mm, respectively.