The response of mesophyll conductance and Rubisco activity to water stress vary with the rice supplied nitrogen nutrition

Figure 1 Rice xylem sap amount (A), root secretion rate (B) and water use efficiency (C) under different N forms and water conditions. The data refer to the mean ±SE (n=4). N, NP, A, AP, NA and NAP represent the nitrate (NO3-), NO3-+PEG6000, ammonium (NH4+), NH4++PEG6000, mixture of ammonium and nitrate (NO3-+NH4+) and NO3-+NH4++PEG6000 treatments, respectively. Significant differences (p Figure 2 Rice leaf Chl (A), total N (B) and Rubisco (C) contents under the different N forms and water conditions. Figure 3 The relationships of net photosynthesis (A) and water use efficiency (WUE) to the mesophyll conductance (gm), stomatal conductance (gs) and ratio of gm/gs in rice leaves.