Figure 9.

Characterization of A. thaliana after 8 weeks of hydroponics culture with 5 mM ${\mathrm{NO}}_3^{-}$ or 5 mM ${\mathrm{NH}}_4^{+}$ as the sole nitrogen source. AOX1a suppressing line (AS-12) and overexpressing line (XX-2) were derived from the presented wild type (WT, Col-0) plants. (A) Fresh weight (FW) of rosettes on respective nitrogen sources. (B) Hydrogen peroxide (H₂O₂) content of leaves. (C) Concentration of reduced ascorbate (AsA) and dehydroascorbate (DHA) as well as the derived AsA/DHA ratio. Bars with different letters indicate significant difference (p ≤ 0.05).