Figure 1.

Spcdc25 expression stimulates lateral root growth. (A) Phenotypes of 10 day-old Arabidopsis seedlings: Wild type (WT), and BTX::Spcdc25 (lines 9 and 10). Bar scale = 10 mm. (B) The relationship between mean total number of lateral roots + lateral root primordia (± SE) and mean primary root length (mm ± SE) for 10 day old seedlings grown at 21°C: Wild type (WT), and two Spcdc25 expressing lines, 9 and 10. Root length in Spcdc25 lines 9 and 10 was not significantly different from WT (P > 0.05). Number of laterals + primordia were significantly different from WT (p = **0.02) in Spcdc25 lines 9 and 10 cf WT. The rate of lateral root formation mm primary root^-1 for each genotype: WT = 0.17, Spcdc25 line 10 = 0.28, Spcdc25 line 9 = 0.26. (C) Adventitious root phenotypes in WT and BTX::Spcdc25 line 9, in 24 d old seedlings. All data are means ± SE; levels of significance (P) are indicated by Student's t-test: P *** < 0.001, P ** 0.02-0.001 P* 0.02-0.05; n = 25