FIGURE 3.

NH₄⁺ and NO₃^- influx rates of WT and transgenic plants measured using ¹⁵N-enriched sources. WT and transgenic rice seedlings were grown in IRRI nutrient solution containing 1 mM NH₄⁺ for 2 weeks and N-starved for 3 days. NO₃^- and NH₄⁺ influx rates were then measured at (A) 0.5 mM ¹⁵NH₄⁺ and (B) 0.5 mM ¹⁵NO₃^- for 5 min. DW: dry weight. Error bars: standard error (n = 4 plants). Significant differences between transgenic and WT lines are indicated by different letters (P < 0.05, one-way ANOVA).