Table 1.

Leaf net photosynthetic rate, photosynthetic nitrogen use efficiency, mesophyll CO₂ diffusion conductance and anatomical traits of the eight rice genotypes. A_area, area-based net photosynthetic rate; A_mass, mass-based net photosynthetic rate; PNUE, photosynthetic nitrogen use efficiency; g_m, mesophyll conductance to CO₂; LMA, leaf mass per area; S_m, the surface area of mesophyll cells exposed to intercellular airspace per leaf area; S_c, the surface area of chloroplasts exposed to intercellular airspaces per leaf area; CWT, cell wall thickness; f_ias, the fraction of intercellular airspaces. *P < 0.05; **P < 0.01; ***P < 0.001.

Genotype	Aarea (μmol m-2 s-1)	Amass (mmol g-1 s-1)	PNUE (μmol g-1 N s-1)	gm (mol m-2 s-1)	LMA (g m-2)	LT (mm)	LD (mg mm-3)	Sm (μm2 μm-2)	Sc (μm2 μm-2)	CWT (nm)	fias (%)
Sab Ini	28.0 ± 3.9	528 ± 74	15.3 ± 2.1	0.21 ± 0.04	53.0 ± 3.1	0.19 ± 0.01	0.28 ± 0.01	9.4 ± 0.6	8.6 ± 0.5	285 ± 43	18.2 + 4.7
Nucleoryza	28.1 ± 0.7	572 ± 15	18.4 ± 0.5	0.31 ± 0.05	49.2 ± 2.1	0.19 ± 0.01	0.25 ± 0.01	10.0 ± 1.3	9.8 ± 1.2	198 ± 14	24.8 + 1.8
Champa	25.7 ± 2.9	572 ± 65	20.1 ± 2.3	0.27 ± 0.02	45.0 ± 1.1	0.20 ± 0.01	0.23 ± 0.01	10.5 ± 1.5	9.2 ± 1.3	243 ± 26	17.3 + 1.7
Kirmizi Celtik	18.1 ± 0.9	362 ± 19	12.7 ± 0.7	0.27 ± 0.04	49.8 ± 2.1	0.20 ± 0.00	0.25 ± 0.00	9.7 ± 1.1	9.1 ± 1.0	231 ± 29	15.1 + 0.5
Huayou 675	29.8 ± 1.1	611 ± 22	20.1 ± 0.7	0.34 ± 0.01	48.8 ± 3.0	0.17 ± 0.02	0.29 ± 0.04	8.6 ± 1.7	7.8 ± 1.6	287 ± 26	17.7 + 2.3
Huanghuazhan	29.3 ± 3.8	512 ± 67	19.1 ± 2.5	0.23 ± 0.02	57.3 ± 0.3	0.35 ± 0.03	0.17 ± 0.02	19.2 ± 2.5	18.8 ± 2.5	262 ± 20	18.3 + 3.0
Teqing	30.8 ± 2.6	656 ± 56	21.9 ± 1.9	0.28 ± 0.05	46.9 ± 0.9	0.29 ± 0.02	0.16 ± 0.01	14.6 ± 3.8	14.1 ± 3.6	205 ± 21	18.8 + 1.5
Yongyou 12	22.3 ± 2.4	311 ± 33	15.3 ± 1.6	0.18 ± 0.04	71.7 ± 1.1	0.33 ± 0.02	0.21 ± 0.01	19.3 ± 1.6	18.7 ± 1.5	330 ± 22	20.3 + 1.5
ANOVA
Average	26.5	516	17.9	0.26	52.7	0.24	0.23	12.7	12.0	257	18.8
Genotype	***	***	***	ns	***	***	***	***	***	***	**