Abstract
Plants primarily incorporate nitrate (NO(3) (-)) and ammonium (NH(4) (+)) as the primary source of inorganic nitrogen (N); the physiological mechanisms of photosynthesis (A) dropdown under NH(4) (+) nutrition has been investigated in many studies. Leaf anatomy is a major determinant to mesophyll conductance (g (m)) and photosynthesis; however, it remains unclear whether the photosynthesis variations of plants exposed to different N forms is related to leaf anatomical variation. In this work, a common shrub, Lonicera japonica was hydroponically grown under NH(4) (+), NO(3) (-) and 50% NH(4) (+)/NO(3) (-). We found that leaf N significantly accumulated under NH(4) (+), whereas the photosynthesis was significantly decreased, which was mainly caused by a reduced g (m). The reduced g (m) under NH(4) (+) was related to the decreased intercellular air space, the reduced chloroplast number and especially the thicker cell walls. Among the cell wall components, lignin and hemicellulose contents under NH(4) (+) nutrition were significantly higher than those in the other two N forms and were scaled negatively correlated with g (m); while pectin content was independent from N forms. Pathway analysis further revealed that the cell wall components might indirectly regulate g (m) by influencing the thickness of the cell wall. These results highlight the importance of leaf anatomical variation characterized by modifications of chloroplasts number and cell wall thickness and compositions, in the regulation of photosynthesis in response to varied N sources.