Figure 6.

Effect of exogenous supply of 1 mm KNO₂ on NO₂^– accumulation (A) and NRT1.1, NIA1, and NiR transcript accumulation in roots of G′4-3 (B) and WT (Col; C) plants. Plants (8 weeks old) were grown hydroponically on a nutrient solution containing 1 mm NH₄NO₃. KNO₂ was added to the medium for 6 or 24 h before harvest (middle of the light period). The values of NO₂^– content are the mean of 10 replicates ± SE. Total RNAs were analyzed by northern blot.