Figure 5. Effect of a localised NO₃⁻ supply on lateral root (LR) development in wild-type (WT) and osnar2.1 knockdown line (r1).

Rice seeds were germinated in trays over a period of 2 d and then transferred to plant culture dishes containing 0.6% Phytagel™ media. Culture dishes were divided into three 5-cm segments; the upper and lower segments were supplemented with 0.2 mM NH₄⁺, and the middle segment was supplemented with 0.2 mM NO₃⁻. (a) Image of LRs responding to localised NO₃⁻ supply after a 3 wk growth period. Bar = 1 cm; (b) LR density in three segments. Values are means ± SE (n = 8). *P < 0.05 (ANOVA) comparing WT and r1 plants in the same treatment.