Table II.

ACC sensitivity of gravitropism and elongation in etiolated wild-type and rcn1 hypocotyls

GrowthaGravitropic Responsea
EcotypeACC2 h6 h2 h6 h
ElongationElongationCurvatureCurvature
μmmm%bmm%bdegrees%bdegrees%b
Ws00.40 ± 0.061001.29 ± 0.1110023.3 ± 2.010029.4 ± 2.0100
Ws0.10.35 ± 0.04891.10 ± 0.078523.6 ± 1.610134.8 ± 2.1118
Ws10.29 ± 0.04730.70 ± 0.09c5416.3 ± 1.8c7025.3 ± 1.786
Ws100.23 ± 0.04c570.50 ± 0.05c3911.1 ± 1.2c4816.4 ± 1.2c56
rcn100.37 ± 0.041001.0 ± 0.0510029.5 ± 1.610044.6 ± 1.8100
rcn10.10.30 ± 0.03810.74 ± 0.057325.4 ± 2.38639.5 ± 2.289d
rcn110.19 ± 0.02c52d0.37 ± 0.03c37d15.0 ± 1.5c51d27.7 ± 1.9c62d
rcn1100.25 ± 0.03c670.45 ± 0.03c4512.5 ± 1.2c4222.7 ± 1.2c51
  • a The average and se of 30 seedlings from three separate experiments are reported. Seedlings were grown for 5 d before transfer to control or ACC containing media and were immediately reoriented 90° relative to gravity.

  • b The elongation and curvature values were normalized to untreated controls in the same genotype with no added ACC.

  • c P < 0.05 for comparison of the growth or gravity response in ACC treatments to the untreated control for each genotype using a Student's t test.

  • d P < 0.05 for comparison of the growth or gravity response in rcn1 to Ws normalized to the untreated control of each genotype at each ACC dose using a Student's t test.