Figure 4.

Examples of positron imaging of plant nitrogen dynamics. A) Using a combination of positron emission tomography (PET) and computerized tomography (CT) scanning, Liang et al.⁴³ identified and quantified uptake and translocation of [¹³N]NO₃− though kohlrabi. The most efficient transport of [¹³N]NO₃− was though the corm, which represented the shortest transport to leaves and buds. B) PETIS imaging of [¹³N]N₂ was used to quantify nitrogen fixation and export from Rhizobia nodules on soybean roots.³⁸ The PET image in A) was adapted with permission from (Liang et al.⁴³). Copyright (2011) American Chemical Society.