Table II.

Effects of ACC, 2,4-D, and various inhibitors on hair formation in Arabidopsis wild-type roots grown under P and Fe deficiency

Treatment	Control	−Fe	−P
None	30 ± 1	45 ± 2	55 ± 2
2,4-D	95 ± 5	94 ± 1	126 ± 10
ACC	80a ± 8	130 ± 11	148 ± 11
NPA	0	1 ± 1	90 ± 12
TIBA	7a ± 2	0	78 ± 7
AVG	1b ± 1	5ab ± 2	49b ± 4
AOA	23 ± 4	7 ± 3	57 ± 5
Co2+	21a ± 4	2a ± 1	44a ± 3
STS	3 ± 2	0	71 ± 8

Values represent no. of root hairs (means ± se) of root hairs per millimeter. Twenty roots were scored for each treatment.

^a Inhibited root hair elongation. 

^b Leaves of this growth type showed chlorosis symptoms.