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Nitrogen uptake capacity of B73 (white) and F44 (black) root systems. (A) High affinity transport (HATS) of 50 μM of nitrate (NO3-) or ammonium (NH4+). (B) Low affinity transport (LATS+HATS) of 2.5 mM of nitrate (NO3-) or ammonium (NH4+). Values are means (±SE) from six individual plants. Similar results were obtained in three other independent experiments. Asterisks indicate significant differences between lines at ∗∗∗P < 0.005 (Student’s t-test).
