Fig. 1.

Lateral root (LR) development and NO accumulation in the tip and LR regions of seminal roots in cvs Nanguang and Elio. (A) LR morphology in the seminal root; scale bar=1cm. (B) LR density in the seminal root. (C) NO production, as indicated by green fluorescence, in representative roots. Scale bar=1mm. (D and E) NO production expressed as the fluorescence intensity relative to the same root region of Nanguang under NH₄ ⁺ supply. Seedlings were grown under NH₄ ⁺ and partial nitrate nutrition (PNN) for 14 d in hydroponic media. Data are means ± standard error (SE), and bars with different letters indicate significant differences at P<0.05, as determined by ANOVA.