. Author manuscript; available in PMC: 2014 Jan 23.

Published in final edited form as: Agric For Meteorol. 2011 Dec 15;151(12):1731–1740. doi: 10.1016/j.agrformet.2011.07.007

Table 1.

Laboratory drought experiment

Net photosynthetic CO₂ assimilation rate, stomatal conductance to H₂O, intercellular CO₂ concentration and water use efficiency measured in well-watered plants (W), under severe drought stress conditions (SWC < 0.01 m³m⁻³) (D) and one and three days after relief of water stress (1,3 DAR). Values represent means of five to six plants ± 1 standard deviation of the mean; different lowercase letters indicate significant differences at P < 0.05 among means within each plant species before and after imposing drought conditions and during the recovery period, while different capital letters indicate significant differences among means at P < 0.05 between well-watered plant species.

Species	Net CO₂ Assimilation (μmol m^-2s^-1)				Stomatal conductance (mol m^-2s^-1)				Intercellular [CO₂] (μmol mol^-1)				WUE (μmol CO₂ / mmol H₂O)
	W	D	1DAR	3 DAR	W	D	1DAR	3 DAR	W	D	1DAR	3 DAR	W	D	1DAR	3 DAR
Trifolium pratense	^B16.82 ± 1.55^a	4.48 ± 2.08^b	16.53 ± 2.35^a	15.18 ± 1.69^a	^A0.208 ± 0.020^a	0.041 ± 0.012^b	0.191 ± 0.020^a	0.220 ± 0.055^a	^A378 ± 6^a	347 ± 15^b	366 ± 1^ab	368 ± 7^ab	^B3.46 ± 0.10^a	4.42 ± 1.10^a	3.79 ± 0.45^a	3.14 ± 0.40^a
Ranunculus acris	^A11.40 ± 1.98^a	1.95 ± 1.45^b	6.59 ± 3.99^ab	10.10 ± 0.88^a	^B0.156 ± 0.033^a	0.048 ± 0.003^b	0.123 ± 0.086^ab	0.165 ± 0.047^a	^A378 ± 6^a	380 ± 22^a	378 ± 6^a	381 ± 6^a	^A2.41 ± 0.35^a	1.86 ± 1.52^a	2.29 ± 0.61^a	2.46 ± 0.62^a
Dactlylis glomerata	^C6.52 ± 1.09^a	1.71 ± 1.63^b	7.36 ± 2.19^a	6.93 ± 1.18^a	^B0.100 ± 0.021^a	0.022 ± 0.011^b	0.123 ± 0.045^a	0.122 ± 0.018^a	^A369 ± 6^a	373 ± 20^a	369 ± 4^a	364 ± 11^a	^A2.57 ± 0.37^a	2.69 ± 1.36^a	2.55 ± 0.28^a	2.38 ± 0.36^a
Taraxacum officinalis	^A12.94 ± 1.41^a	2.26 ± 1.62^b	5.41 ± 2.00^b	10.53 ± 1.26^a	^B0.128 ± 0.027^a	0.013 ± 0.008^b	0.060 ± 0.022^b	0.143 ± 0.035^a	^B331 ± 6^a	342 ± 40^a	325 ± 5^a	332 ± 5^a	^C4.47 ± 0.65^a	4.04 ± 1.76^a	3.76 ± 0.37^ab	3.26 ± 0.50^b