. 2014 Dec 2;115(3):409–418. doi: 10.1093/aob/mcu216

Table 3.

Underwater net photosynthesis (P_N) (µmol O₂ m⁻² s⁻¹) of succulent stems of Tecticornia auriculata and Tecticornia medusa measured as O₂ production in artificial lake water after four submergence durations (0, 3, 6 and 12 d) and at two different CO₂ concentrations (40 and 400 µm dissolved CO₂)

CO₂ conc.	Species	^#0 d	3 d	6 d	12 d
40 µm	T. auriculata	0·89 ± 0·09^c	0·09 ± 0·03^a	0·07 ± 0·01^a	0·03 ± 0·01^ab
	T. auriculata (Triton X-100)	0·08 ± 0·05^ab	0·11 ± 0·04^a	n.m.	n.m.
	T. medusa	0·04 ± 0·02^a	0·10 ± 0·04^a	0·07 ± 0·04^a	0·02 ± 0·01^a
	T. medusa (Triton X-100)	0·04 ± 0·02^a	0·12 ± 0·04^a	n.m.	n.m.
400 µm	T. auriculata	5·54 ± 0·73^d	0·45 ± 0·19^b	0·43 ± 0·08^b	0·40 ± 0·10^c
400 µm	T. medusa	0·62 ± 0·25^bc	0·38 ± 0·04^b	0·18 ± 0·07^a	0·09 ± 0·02^b

At 40 µm CO₂ some stems were brushed with 0·05 % (v/v) Triton X-100 solution to remove gas films in the 0 and 3 d submergence treatments. Different letters indicate significant differences between rows using ANOVA and Tukey’s HSD post-hoc test (P < 0·05). Values are means ± s.e. (n = 4). ^#0 days refers to measurements taken as soon as stems were first submerged; n.m. = not measured.