Table 2.

Number of Preemerged and Emerged Lateral Root Initials in Response to Homogeneous or Localized Fe Supply

Fe Concentrations (μM)	Preemerged	Emerged	Total	Rate of Emergence
Homogeneous supply
10	1.0 ± 0.44	5.4 ± 0.81	6.4 ± 0.41	1.24
50	2.5 ± 0.42	3.6 ± 0.24	6.1 ± 0.38	1.03
200	2.8 ± 0.21	4.8 ± 0.20	7.6 ± 0.25	1.27
Localized supply
10	3.0 ± 0.41	2.5 ± 0.87	5.5 ± 0.40	0.72
50	1.7 ± 0.33	5.5 ± 0.67	7.2 + 0.48	1.61
200	1.8 ± 0.54	6.3 ± 0.42	8.1 ± 0.50	1.78

Lateral root initials of ProCYCB1;1:GUS plants were counted and classified according to Malamy and Benfey (1997) after 6 d of Fe treatments. Values represent means ± se; n = 15 to 20 seedlings. The rate of lateral root emergence (emerged lateral roots per day) was obtained by calculating the number of emerged lateral roots formed between 3 and 6 d after transfer to treatments.