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<5%)
between treatments of rice are indicated by different letters. The same as
below.

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.