. 2016 Nov 22;7:1738. doi: 10.3389/fpls.2016.01738

Table 2.

Total leaf (LDW), shoot (SDW), root (RDW) and plant (PDW) dry weight, root/shoot ratio, number of tillers per plant, and normalized difference vegetation index (NDVI) in four durum wheat genotypes grown under ambient or elevated [CO₂] and well-watered or severe water stress conditions (100 vs. 30% pot capacity).

	Genotype	Ambient [CO₂]		Elevated [CO₂]		P_C	P_W	P_{C × W}
		Well-watered	Water stressed	Well-watered	Water stressed
LDW (g)	Mexa	2.40^a	2.69^a	4.73^b	1.97^a	0.127	0.031	0.012
	Regallo	1.09^a	1.75^b	4.56^c	2.23^b	<0.001	0.001	<0.001
	Burgos	2.77	1.70	4.67	1.80	0.082	0.004	0.112
	Ramirez	2.27	1.86	3.28	1.98	0.178	0.057	0.282
SDW (g)	Mexa	4.26^a	4.96^a	8.35^b	4.97^a	0.039	0.147	0.040
	Regallo	1.49^a	3.71^b	6.24^c	3.20^b	0.001	0.361	<0.001
	Burgos	4.78	4.21	8.43	5.43	0.058	0.143	0.301
	Ramirez	3.59	3.53	6.98	3.73	0.035	0.048	0.054
RDW (g)	Mexa	1.31^a	1.14^a	2.65^b	1.47^a	0.002	0.008	0.030
	Regallo	2.42	1.92	3.54	2.45	0.002	0.002	0.139
	Burgos	1.54	1.33	3.01	1.75	0.003	0.012	0.053
	Ramirez	1.59	1.37	2.33	1.93	0.013	0.166	0.689
PDW (g)	Mexa	5.56^a	6.10^a	10.99^b	6.44^a	0.018	0.074	0.031
	Regallo	3.91^a	5.63^b	9.78^c	5.65^b	<0.001	0.025	<0.001
	Burgos	6.32	5.54	11.43	7.19	0.011	0.039	0.128
	Ramirez	5.18	4.89	9.32	5.66	0.012	0.032	0.058
Root/shoot	Mexa	0.33	0.23	0.32	0.30	0.400	0.123	0.267
	Regallo	1.65^b	0.58^a	0.57^a	0.76^a	0.011	0.013	0.002
	Burgos	0.40	0.48	0.36	0.34	0.563	0.850	0.718
	Ramirez	0.58	0.39	0.34	0.53	0.662	0.994	0.136
Tiller/plant	Mexa	9.3	9.3	11.0	7.0	0.852	0.279	0.279
	Regallo	6.3^a	8.0^a	15.7^b	10.0^a	0.002	0.138	0.017
	Burgos	12.3	7.0	13.0	8.7	0.377	0.005	0.699
	Ramirez	8.0	7.7	6.7	6.7	0.773	0.174	0.267
NDVI	Mexa	0.29	0.18	0.36	0.13	0.678	<0.001	0.104
	Regallo	0.29	0.18	0.34	0.15	0.610	<0.001	0.067
	Burgos	0.25	0.17	0.30	0.16	0.524	0.006	0.347
	Ramirez	0.29	0.18	0.25	0.16	0.287	0.003	0.651

Significant effects for elevated [CO₂] (C), water stress (W) and their interaction (C × W) were determined by two-factor ANOVA (P). Values with the same letter are not significantly different for the interaction [CO₂] × water level. Significant P values are marked in bold (P < 0.05).