Figure 1
From: Isolation and functional characterization of a high affinity urea transporter from roots of Zea mays
Kinetic assay of urea uptake by maize roots. The concentration-dependent uptake was measured using 5-day-old maize plants exposed for 4 h to a nutrient solution supplied with 1 mM urea as a sole nitrogen source (b) or not (control plants, a). Subsequently roots were incubated for 10 minutes in the assay solution containing urea at different concentrations (2.5-5-10-25-50-100-200-300 μM). Values are means ± SD (n = 3).