Table I.

Spatial and temporal dimensions of the meristem and elongation zone in response to external application of 30 nm 2,4-D, 1.0 μm zeatin and in the stp1 mutant

TreatmentLengthCell No.Residence Time
MeristemElongationMeristemElongationMeristemElongation
μm h
Wild type488 ± 421,362 ± 9252 ± 316 ± 2107 ± 98 ± 1
2,4-D530 ± 42710 ± 5250 ± 16 ± 1158 ± 75 ± 1
Zeatin273 ± 35418 ± 3720 ± 14 ± 1113 ± 57 ± 1
stp1 306 ± 37327 ± 5423 ± 27 ± 284 ± 77 ± 1

Data report the means ± se of 10 roots on d 8 for the wild type (data from Beemster and Baskin, 1998), 10 roots combined from d 6 and 8 for the zeatin and stp1treatments, and 5 roots on d 8 for the 2,4-D treatment.