Table VI.

Effects of application of IAA to the upper and lower halves of roots

Agar	Lateral Root No.	Lateral Root Densitya	Change in Lengthb
			mm
Controlc	4.6  ± 0.4	0.62  ± 0.06
Controld	5.3  ± 0.9	0.14  ± 0.02	43.7  ± 1.8
IAAc	7.2  ± 0.5	0.98  ± 0.27e
Controld	9.1  ± 1.8	0.33  ± 0.06f	37.8  ± 1.8
Controlc	4.3  ± 0.4	0.47  ± 0.06e
IAAd	10.1  ± 0.9	0.30  ± 0.03f	42.4  ± 2.5

Six-day-old seedlings were transferred to plates containing 0.1 μm IAA in the upper or lower half, as indicated. After 4 additional d of growth in the light, lateral roots in the upper and lower halves were counted and new primary root growth was measured. The reported values are averages ± se of 10 plants.

^aThe lateral root density was calculated by dividing the number of lateral roots by the primary root length for each plant, and is reported as the number of lateral roots per millimeter of primary root. 

^bThe amount of elongation of the primary root after transfer to the indicated plates. 

^cThe compound in agar and the lateral root development on the upper half of the plate is shown. 

^dThe compound in agar and the lateral root development on the lower half of the plate is shown. 

^eThese values are not statistically different from the control values (P ≥ 0.06). 

^fThese values are statistically different from the control values (P ≤ 0.004).