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Steady-state NH4+ influx into roots of intact cv IR-72 rice seedlings as a function of [NH4+]o in the high-affinity transport range (2.5–500 μm) at 100 and 35% O2. ▪ (solid line for isotherm fit), Control plants at 100% O2 provision; and • (dotted line for isotherm fit), plants exposed to 35% O2 for 7 d prior to the influx determinations. Kinetic analysis according to Cornish-Bowden and Wharton (see text) was used for the derivation of Vmax and Km values. Data are means ± se (n ≥ 12).
