Figure 7.

A, Levels of ¹¹C-labeled soluble sugars (presented as % total ¹¹C activity fixed as ¹¹CO₂) were plotted for the following tissues: load leaf at 10 min postadministration of ¹¹CO₂, load leaf at 90 min postadministration of ¹¹CO₂, and roots at 90 min postadministration of ¹¹CO₂ to leaves. The gross export of ¹¹C-labeled soluble sugars was calculated from the difference in load leaf activities at 10 and 90 min. Root herbivore treatment manifested in a significant reduction in root allocation of ¹¹C-labeled soluble sugars. B, Relative distributions of ¹¹C-labeled soluble sugars are presented for the load leaf and roots at 90 min postadministration of ¹¹CO₂ and as a function of root herbivore treatment.