Figure legends

Figure 1 . Tiller number at leaf-age 4 and 6, tiller occurrence percentage, and biomass accumulation in response to N application rate and CO2 concentration.
Error bars are standard deviations; Bars with different letters mean they are significantly different at p≤0.05.
Figure 2 . The responses of N content in leaf, sheath, and new-born tillers to N application rate and CO2conditions (A, B and C), and their relative change under eCO2 to ambient CO2 condition.
Error bars are standard deviations; Bars with different letters mean they are significantly different at p≤0.05
Figure 3 . Carbohydrates change in response to N application rate and CO2 condition.
L1-L5 represent leaf positions 1-5, respectively; SU and SD represent up and down part of sheath, respectively; tiller were new-born ones at leaf-age 6; Error bars are standard deviations; Bars with different letters mean they are significantly different at p≤0.05.
Figure 4. The number of differentially expressed genes (DEG) and Venn diagrams of different comparisons.
A and C represent ambient and enriched CO2, respectively; L3 and M stand for leaf number 3 and SAM respectively; 0 and 10 represent N application rate N0 and N10, respectively.
Figure 5 . The gene expression (FPKM) in leaf and SAM in response to N application and CO2 condition.
L for leaf, M for SAM, Ambient and eCO2 stand for ambient and enriched CO2 treatments, respectively. Error bars are standard deviations; Bars with different letters mean they are significantly different at p≤0.05.