Table I. Comparison of the effects of IAA, ACC, and AVG on primary root growth, cortex cell length, and LR initiation in Arabidopsis

Seedlings were treated with 250 μm Fe (+Fe) with or without 0.01 μm IAA, 0.05 μm ACC, and 1 μm AVG for 5 d. The means ± se are reported with n ≥ 5 (P ≤ 0.05). Different letters represent means statistically different at the 0.05 level (one-way ANOVA with Duncan's post hoc test).

BackgroundRoot Growth IncrementCell LengthLR DensityaLR Frequencyb
mmμm
Control51.8 ± 0.67 b226.3 ± 5.8 ab0.41 ± 0.01 e12.8 ± 0.73 c
+Fe21.1 ± 0.44 e156.8 ± 3.8 d0.64 ± 0.03 c9.02 ± 0.79 d
+IAA51.2 ± 0.66 b212.3 ± 3.7 bc0.49 ± 0.02 d14.8 ± 0.37 b
Fe + IAA20.8 ± 0.22 e154.4 ± 3.8 d1.26 ± 0.02 a17.7 ± 0.39 a
+ACC35.8 ± 0.37 c196.2 ± 4.8 c0.56 ± 0.03 d11.4 ± 1.15 c
Fe + ACC26.8 ± 0.28 d163.7 ± 2.1 d1.03 ± 0.01 b16.2 ± 0.85 a
+AVG54.8 ± 0.37 a233.5 ± 12.1a0.38 ± 0.03 e12.2 ± 0.37 c
Fe + AVG10.0 ± 0.34 f103.4 ± 2.2 e0.56 ± 0.02 d3.50 ± 0.24 e
  • a No. of initiation events per millimeter.

  • b No. of initiation events per 100 cortical cells.