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The highest underwater O2 production (4 ��mol O2 g?1 DW h?1) was recorded in H. portulacoides at 0.5 mM dissolved CO2, while S. maritima showed the lowest (1.6 ��mol O2 g?1 DW h?1) even at elevated dissolved CO2 concentrations (2 mM). On the other hand, S. maritima exhibited the highest respiratory rates (O2 consumption in the dark), independently of the applied dissolved CO2 concentration. Figure?1. selleck chemicals llc Oxygen production and consumption by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average �� standard deviation, n = 9. Letters indicate significant differences among CO2 treatments at Phttp://www.selleckchem.com/products/SRT1720.html leaves of H. portulacoides showed a decrease in both with increasing CO2 treatments, presenting a maximum at 0.5 mM dissolved CO2. On the other hand, in S. maritima the Fv in dark-adapted leaves showed an evident increase along with increasing dissolved CO2 concentrations. Nevertheless, there was no distinguishing pattern in the variable fluorescence data in light-adapted leaves of S. maritima. Figure?2. Photosystem II variable fluorescence and quantum efficiencies (operational and maximum) by the two tested species under light and dark conditions, at different levels of dissolved CO2 (average �� standard deviation, n = 9. Letters indicate significant ... Kautsky curves and transient OJIP parameters The O�CJ phase of the Kautsky curves of all samples presented similar patterns, independently of the dissolved CO2 concentrations (Fig.?3). In H. portulacoides, the more evident differences were observed during the thermal phase (J�CI�CP), with higher values in the samples exposed to higher dissolved CO2 concentrations. During the UNC2881 photochemical phase (O�CJ), there was generally an overlap of the Kautsky plots among treatments. For S. maritima leaves, the increase in dissolved CO2 leads to an increase in the intensity of both the photochemical and thermal phases, the latter being more pronounced in leaves subjected to the higher concentration of dissolved CO2. Figure?3. Kautsky OJIP curves of the two tested species under light and dark conditions, at different levels of dissolved CO2 (average, n = 9). Regarding the OJIP-derived photochemical parameters, as well as the energy flux variables, some differences were evident (Figs?3 and ?and4).4). The maximum quantum yield of primary PSII photochemistry (��Po) was generally maintained both among CO2 treatments and species. On the other hand, in H.