Figure 4.

Capacity of chloroplast electron transport chain in A. thaliana nourished with 5 mM ${\mathrm{NH}}_4^{+}$ or 5 mM ${\mathrm{NO}}_3^{-}$ (control) as the only source of nitrogen. (A) Total electron transport chain capacity. (B) Capacity of Photosystem I (PSI) and Photosystem II (PSII). Bars with different letters indicate significant difference (p ≤ 0.05).