Figure 3.

Increased nitrate allocation to roots of nrt1.5 mutants. Four-week-old hydroponically grown plants were treated by 50 mm NaCl for 3 d (A), 10% PEG for 24 h (B), 20 μm CdCl₂ for 3 d (C), or under control conditions (Ctl). Then, shoot and root tissues were harvested and subjected to determination of nitrate concentration by HPLC. The numbers above each bar represent root-shoot nitrate ratio. Values are means ± sd from three replicates, and each pooled more than nine plants. FW, Fresh weight.