Table IV.

Comparison between maize Dea and W22 incubated with Glc with or without starvation pretreatment

Maize root tips were incubated with [U-¹⁴C]Glc and [1-¹³C]Glc (see “Materials and Methods”) after starvation pretreatment (maize root tips were incubated 4 h without Glc and then 25 h plus labeled Glc) or not. For Dea, with starvation pretreatment, the ratio C-1 to C-6 and the fluxes were calculated from data published by Dieuaide-Noubhani et al. (1995). All fluxes, Vres, Vgpase, and Vi were determined as for W22 (see “Results”). The values of relative fluxes were calculated for a rate of Glc consumption (Vg) equal to 1. The values of absolute fluxes were then calculated for Vg equal to 350 and 394 nmol min⁻¹ g⁻¹ FW for Dea and W22, respectively. Results are given as mean ± sd (n = 5 for W22 without starvation pretreatment, and n = 2 for W22 with starvation pretreatment). For Dea without starvation pretreatment, results are from one experiment.

	Without Starvation Pretreatment		With Starvation Pretreatment
	Dea	W22	Dea	W22
Enrichment ratio C-1 to C-6
Sucrose glucosyl	4.6	4.3 ± 0.4	5.7	5.9 ± 0.4
Sucrose fructosyl	3.8	3.7 ± 0.3	5.4	5.0 ± 0.2
Glucose	6.5	5.1 ± 0.5	8.6	8.1 ± 0.4
Relative fluxes
Vres	2.9	6.86 ± 1.33	2.1	3.0 ± 0.2
Absolute fluxes (μmol min−1 g−1 FW)
Vres	1.0	2.70 ± 0.52
Vi	0.2	0.15 ± 0.03
Vgpase	0.8	2.55 ± 0.52