. 2018 May 17;122(2):325–336. doi: 10.1093/aob/mcy073

Table 2.

Results of variance analysis and Tukey test between means of variables for the three origins of Dactylis glomerata populations

	Biogeographic origin of D. glomerata populations
	P-value	Mediterranean	Northern	Temperate
SURV, plant dehydration survival (%)	<0.001***	58.2^a	13.1^b	6.9^b
P ₅₀, embolism pressure threshold for 50 % embolism (MPa)	0.0016**	–5.8^a	–4.3^ab	–3.3^b
P ₈₈, embolism pressure threshold for 88 % embolism (MPa)	<0.001***	–10.4^a	–7.6^ab	–6.1^b
Lwidth, leaf width (mm)	<0.001***	4.28^a	7.97^c	6.22^b
Lthick, leaf thickness (mm)	0.13n.s.	0.30	0.36	0.35
LDMC, leaf dry matter content (mg g DM^–1)	<0.001***	232.72^a	185.75^b	188.41^b
LFrac, leaf fracture resistance (J m^–2)	<0.001***	478.6^a	188.47^b	225.55^b
A _S, total stem area (mm²)	0.006**	2.07^a	3.09^b	2.9^b
A _LIG, lignified area (μm²)	0.02*	0.27^a	0.38^b	0.33^ab
P _LIG, proportion of lignified area per total stem area	0.02*	0.1308^b	0.1258^ab	0.115^a
A _F, fibre cell area (μm²)	0.34n.s.	70.61	77.21	77.56
A _FL, fibre lumen area (μm²)	0.50n.s.	15.95	14.16	14.76
A _FW, fibre wall area (μm²)	0.12n.s.	54.66	63.04	62.79
P _CW F, proportion of cell wall per fibre	0.029*	0.77 ^a	0.82^b	0.81^ab
P _FW F × A_LIG, proportion of total fibre wall area in lignified area	0.037*	0.30 ^ab	0.33^b	0.29^a
(P_FWF × A_LIG):A_S, proportion of total fibre wall in lignified area per stem area	0.002**	0.156^a	0.117^b	0.102^b
D _HV, hydraulically weighted diameter of vessels (μm)	0.17n.s.	23.04	21.77	21.18
T _VW, thickness of metaxylem vessel wall (μm)	<0.001***	1.426^c	1.226^b	1.109^a

***P < 0.001; **P < 0.01; *P < 0.05; n.s., non-significant. For each variable, different superscript letters indicate significant differences between origins.