Table 2. Effect of phenyl substituents on stem elongation of Arabidopsis seedlings.

Comp. No.	R	Hypocotyl length (cm)
		10 (μM)	100 (μM)
C1	2-Fluoro	1.14±0.03	1.01±0.01
C2	3-Fluoro	1.10±0.02	0.98±0.03
C3	4 Fluoro	1.07±0.06	0.84±0.03
C4	2,4-Difluoro	1.12±0.01	1.03±0.08
C5	3,4-Difluoro	1.10±0.05	0.79±0.08
C6	2,4,5-Trifluoro	1.12±0.05	1.04±0.01
C7	3-Chloro-2-fluoro	1.14±0.01	0.92±0.06
C8	3-Chloro-4-fluoro	1.15±0.05	0.40±0.03
C9	4-Chloro-3-trifluoromethyl	1.00±0.03	0.33±0.02
C10	5-Chloro-2-methoxy	1.14±0.09	0.73±0.04
C11	4-Methyl	1.02±0.04	0.80±0.05
C12	4-Ethyl	0.62±0.03	0.53±0.04
C13	4-Propyl	0.80±0.05	0.45±0.02
C14	4-tert-Butyl	0.96±0.02	0.26±0.01
C15	4-Phenyl	1.08±0.04	0.60±0.03
C16	2,5-Dimethyl	1.12±0.05	0.97±0.05
C17	2,4,6-Trimethyl	0.79±0.03	0.49±0.04
C18	4-Methoxy	1.03±0.04	0.64±0.03
C19	4-Isopropoxy	1.13±0.03	0.54±0.03
C20	4-Trifluoromethyl	0.82±0.06	0.37±0.03
C21	2-Trifluoromethyl	1.06±0.03	0.45±0.02
C22	2,4,5-Trichloro	0.90±0.04	0.55±0.03
C23	4-Bromo-2,5-difluoro	0.92±0.03	0.62±0.04
C24	4-Phenylazo	0.88±0.05	0.72±0.01
EH-8	3,4-Dichloro	0.63±0.03	0.48±0.02
Ethephone		0.69±0.06	0.41±0.01
Control		1.15±0.01

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