Figure 6.

Dynamic carbon budget using combined data for control wheat plants in Figures 1 and 2; all data were converted to bequerels and were then scaled so that for each plant cumulative ¹⁴C import into rest of plant from leaf 2 at 20 h = 100 {▪, data for control plant in Figs. 2 and 3; a,= estimated value for cumulative exudation at 20 h; the figure shows the two estimates of cumulative gross ¹⁴C import into the root (○, fixed proportion of ¹⁴C import into rest of plant from leaf 2 with 0.5-h time displacement; ▵, sum of root ¹⁴C content and estimated root ¹⁴C respiration derived from dynamics in Fig. 3}. The total cumulative import into the rest of the plant from leaf 2 at 20 h was 16,000 Bq.