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Table 1 Effects of different nitrogen supply levels on rice biomass (g), leaf area (cm2), leaf nitrogen content (NL, g m− 2), Rubisco content (g m− 2), stomatal conductance (gs, mol CO2 m− 2 s− 1), mesophyll conductance (gm, mol CO2 m− 2 s− 1), chloroplast CO2 concentration (Cc, μmol mol− 1), photosynthesis rate (Pn, μmol m− 2 s− 1), and photosynthetic nitrogen use efficiency (PNUE, μmol CO2 mmol− 1 N s− 1). Rice plants (“Zhendao 11”) were supplied with NH4+ (AN) or NO3 (NN) under 3 different amounts, low N (0.71 mM, LAN and LNN), intermediate N (2.86 mM, MAN and MNN), and high N (7.14 mM, HAN and HNN). Data are presented as the means ± SD of four replications. Significant differences (P < 0.05) between treatments are indicated by different letters

From: Anatomically induced changes in rice leaf mesophyll conductance explain the variation in photosynthetic nitrogen use efficiency under contrasting nitrogen supply

Treatments Biomass Area NL Rubisco gs gm Cc Pn PNUE
LAN 3.29 b 658 c 1.55 d 2.02 d 0.35 b 0.16 c 180 ab 24.61 b 0.22 b
MAN 5.71 a 932 a 2.38 b 3.16 b 0.45 a 0.24 ab 171 ab 28.74 a 0.17 cd
HAN 5.59 a 873 ab 2.58 a 3.67 a 0.49 a 0.28 a 187 a 29.25 a 0.16 d
LNN 3.77 b 595 c 1.30 e 1.49 e 0.27 b 0.16 c 165 b 25.00 b 0.27 a
MNN 4.92 a 837 b 2.11 c 2.50 c 0.44 a 0.20 bc 176 ab 29.86 a 0.20 bc
HNN 5.57 a 834 b 2.34 b 2.90 b 0.44 a 0.19 bc 176 ab 30.30 a 0.18 cd