Table II.

Basipetal IAA transport in Arabidopsis inflorescence segments

	Basipetal IAA Transporta
	Columbiab	tt4(2YY6)b	Lerc	tt4(85)c
	cpm
Minus NPAd	667 ± 100	1176 ± 114	675 ± 41	1131 ± 41
Plus NPAd	15 ± 1	17 ± 1	254 ± 36	255 ± 37

^a IAA transport was measured on basal inflorescence segments after 5 h using 100 nm [³H]-IAA. 

^b Reported values are average and se of 30 to 40 replicates and transport was measured in the presence and absence of 100 μm NPA. 

^c Reported values are the average and se of 10 replicates and transport was measured in the presence and absence of 10 μm NPA. 

^d Comparison of basipetal IAA transport in the absence of NPA indicates that the difference between Columbia and tt4(2YY6) and between Ler and tt4(85) are statistically different with P values < 0.001, as determined by Student's t test analysis. In the presence of NPA there is no significant difference between basipetal transport in Columbia and tt4(2YY6) or Ler and tt4(85) with P values > 0.2, as determined by Student's t test.