Table 2.

Least square means for the studied traits

Variable	CO2 level	Watering level	Genotype
			4		132		144		147
SLA (m2 kg−1)	aCO2	WW	6·54	ab #	7·15	a #	6·38	bc #	7·62	a #
		WD	6·90	a	6·92	a	5·64	b	6·57	b
	eCO2	WW	5·40	a	5·59	a	5·37	a	5·52	a #
		WD	5·09	b #	5·68	b #	5·61	b	6·23	a
Ψπ (MPa)	aCO2	WW	−1·65	a	−1·65	a *	−1·57	a *	−1·60	a *
		WD	−1·84	a	−1·87	a	−1·90	a	−1·84	a
	eCO2	WW	−1·61	a	−1·49	a	−1·69	a	−1·67	a
		WD	−1·85	b *	−1·80	b *	−2·01	ab *	−2·11	a #*
Nm (cg g−1)	aCO2	WW	1·52	ab	1·99	a	1·19	b *	1·01	b
		WD	1·94	a	1·80	a	1·81	a	1·24	b
	eCO2	WW	1·41	ab	1·56	a	1·08	bc	0·66	c
		WD	1·05	bc #	1·71	a	1·11	ab	0·84	c
Na (g m−2)	aCO2	WW	2·10	ab	2·82	a	1·90	ab	1·35	b
		WD	2·55	ab	2·51	ab	2·96	a	1·52	c
	eCO2	WW	1·87	a	2·22	a	1·88	a	0·89	b
		WD	1·59	bc #	2·61	a	1·82	ab #	1·25	c
PNUE (μmol mol−1 s−1)	aCO2	WW	46·12	ab #*	29·37	b #	49·92	ab *	72·63	a #*
		WD	13·41	a	20·81	a	20·01	a	23·22	a
	eCO2	WW	83·49	b	60·39	bc	58·45	c	134·91	a
		WD	55·84	a #	27·47	b *	42·64	ab	51·74	ab *
Δ13C (‰)	aCO2	WW	22·21	a	22·85	a *	22·28	a	22·74	a
		WD	21·05	a	20·69	a	21·02	a	21·43	a
	eCO2	WW	24·02	a	24·24	a	23·13	a	24·57	a
		WD	21·59	ab *	21·85	ab *	23·54	a	21·34	b *
δ18O (‰)	aCO2	WW	23·88	a	24·44	a	24·48	a	23·82	a
		WD	23·39	b	25·50	a	24·83	ab	25·01	ab
	eCO2	WW	22·55	a	23·32	a	23·84	a	22·89	a
		WD	24·47	a *	24·72	a	25·89	a *	24·74	a *

The values are computed for the covariate (‘initial size’) at its mean. The letter codes denote homogeneous groups (Fisher’s least significant difference post-hoc test) among genotypes of the same treatment. ^#Significant differences between growth [CO₂] levels in the same watering level (WW, well-watered conditions; WD, water deficit). *Significant differences between watering levels in the same growth [CO₂] level (aCO₂, ambient [CO₂]; eCO₂, elevated [CO₂]).