Table 3. Effect of phenyl substituents on root growth of Arabidopsis seedlings.

Comp. No.	R	Root length (mm)
		10 (μM)	100 (μM)
C1	2-Fluoro	2.5±0.1	2.5±0.1
C2	3-Fluoro	2.5±0.1	2.4±0.2
C3	4 Fluoro	2.5±0.3	2.1±0.3
C4	2,4-Difluoro	2.6±0.1	2.4±0.2
C5	3,4-Difluoro	2.3±0.2	2.4±0.1
C6	2,4,5-Trifluoro	2.5±0.3	2.6±0.3
C7	3-Chloro-2-fluoro	2.6±0.2	2.5±0.3
C8	3-Chloro-4-fluoro	2.5±0.1	2.3±0.3
C9	4-Chloro-3-trifluoromethyl	2.6±0.1	2.4±0.2
C10	5-Chloro-2-methoxy	2.8±0.2	3.5±0.2
C11	4-Methyl	2.4±0.1	2.4±0.3
C12	4-Ethyl	2.4±0.1	2.1±0.2
C13	4-Propyl	2.4±0.1	1.7±0.3
C14	4-tert-Butyl	2.6±0.2	1.3±0.1
C15	4-Phenyl	2.3±0.1	2.3±0.2
C16	2,5-Dimethyl	2.3±0.3	2.7±0.2
C17	2,4,6-Trimethyl	3.7±0.5	2.8±0.2
C18	4-Methoxy	2.1±0.1	1.6±0.2
C19	4-Isopropoxy	2.8±0.2	2.3±0.2
C20	4-Trifluoromethyl	2.5±0.2	2.5±0.2
C21	2-Trifluoromethyl	1.8±0.2	1.0±0.2
C22	2,4,5-Trichloro	1.6±0.3	1.9±0.2
C23	4-Bromo-2,5-difluoro	1.9±0.2	2.1±0.2
C24	4-Phenylazo	1.8±0.1	1.9±0.3
EH-8	3,4-Dichloro	1.9±0.3	1.5±0.4
Ethephone		1.0±0.1	0.7±0.1
Control		2.3±0.1

Data are the means±S.E. obtained from 11 to 15 plants. All the experiments were done three times to establish the repeatability.