. 2016 Nov 1;11(11):e0165733. doi: 10.1371/journal.pone.0165733

Table 1. Interactive effects of N supply and water status on gas exchange and water use efficiency in two varieties of wheat.

Treatment	P_n [μmol (CO₂ m^-2s^-1)]		E [mmol (H₂O m^-2s^-1)]		G_s [mol (H₂O m^-2s^-1)]		C_i [μmol (CO₂) mol^-1]		WUE [μmol(CO₂)mol(H₂O)^-1]		WUE_i [μmol(CO₂)mol(H₂O)^-1]		Ls
Treatment	Xinong979	Large-spike	Xinong979	Large-spike	Xinong979	Large-spike	Xinong979	Large-spike	Xinong979	Large-spike	Xinong979	Large-spike	Xinong979	Large-spike
NlWw	17.26±0.22^cd	16.14±0.38^d	7.72±0.19^e	6.64±0.21^e	0.437±0.01^d	0.521±0.01^d	258.0±1.08^e	250.8±1.05^g	2.25±0.07^a	2.44±0.06^bc	39.49±0.69^a	30.98±0.66^a	0.330±0.01^a	0.351±0.01^a
NlWm	13.67±0.36^b	11.44±0.38^b	4.35±0.21^c	6.89±0.14^e	0.229±0.01^b	0.381±0.01^c	236.1±1.75^b	230.2±0.87^c	3.21±0.20^b	1.67±0.08^a	60.55±3.37^c	30.15±1.26^a	0.389±0.01^d	0.402±0.01^d
NlWs	6.96±0.39^a	6.86±0.41^a	1.16±0.07^a	2.97±0.13^ab	0.125±0.00^a	0.162±0.01^a	230.3±1.12^b	219.0±1.06^a	6.17±0.49^d	2.33±0.17^b	56.37±4.59^c	43.46±3.81^bc	0.400±0.01^e	0.436±0.01^f
NmWw	18.23±0.18^d	17.65±0.49^d	8.15±0.24^e	7.85±0.16^f	0.558±0.01^e	0.578±0.01^e	243.1±1.28^c	241.8±0.81^ef	2.25±0.07^a	2.26±0.07^b	32.77±0.85^a	30.67±1.26^a	0.365±0.01^c	0.375±0.01^bc
NmWm	17.30±0.20^cd	14.14±0.59^c	7.24±0.31^e	4.16±0.20^d	0.400±0.01^d	0.261±0.01^b	234.0±1.17^b	219.4±1.91^a	2.43±0.12^ab	3.46±0.20^de	43.84±2.06a^ab	54.45±2.71^de	0.388±0.01^d	0.429±0.01^ef
NmWs	13.76±0.25^b	11.55±0.46^b	3.41±0.17^b	3.44±0.168^c	0.147±0.01^a	0.185±0.01^a	212.7±2.19^a	225.4±1.44^bc	4.10±0.17^c	3.41±0.21^de	95.68±4.77^d	63.08±3.16^e	0.448±0.01^f	0.417±0.01^e
NhWw	18.22±0.18^d	17.82±0.39^d	7.89±0.23^e	6.88±0.24^e	0.537±0.01^e	0.493±0.01^d	236.3±1.20^b	237.6±1.11^d	2.33±0.07^ab	2.61±0.07^bc	34.09±1.05^a	36.20±0.86^ab	0.386±0.01^d	0.386±0.01^c
NhWm	16.76±0.27^c	12.03±0.48^b	5.57±0.25^d	4.04±0.10^cd	0.311±0.01^c	0.249±0.01^b	250.1±0.75^d	243.3±1.01^f	3.06±0.15^ab	2.98±0.12^cd	54.36±1.91^bc	48.67±2.32^cd	0.346±0.01^b	0.368±0.01^b
NhWs	14.21±0.23^b	10.40±0.45^b	5.52±0.24^d	2.69±0.14^a	0.281±0.01^c	0.171±0.01^a	243.7±1.82^cd	224.3±1.00^ab	2.62±0.14^ab	3.91±0.13^e	51.37±2.86^bc	61.87±4.32^e	0.360±0.01^c	0.417±0.01^e
C	***		***		ns		***		***		***		***
N	***		***		***		***		ns		***		***
W	***		***		***		***		***		***		***
C×N	***		***		***		***		***		***		***
C×W	***		ns		**		**		***		*		***
N×W	***		***		***		***		***		***		***
C×W×N	**		***		***		***		***		***		***

P_n—net photosynthetic rate; E–transpiration rate, G_s—stomatal conductance; C_i—intercellular CO₂ concentration; WUE—instantaneous water use efficiency; WUE_i—intrinsic water use efficiency; L_s—stomatal limitation value (based on [9]); C—cultivars; N—nitrogen; W—water. Nl—low N; Nm—medium N; Nh—high N; Ww—well-watered; Wm—moderate water stress; Ws—severe water stress. Values are means± standard error (SE), n = 3. Different letters within the same column denote the differences between the treatments (P<0.05). NS: no significant at the 0.05 level; *, **, ***, significant at P<0.05, P<0.01 and P<0.001, respectively.