Journal: Annals of Botany
Article Title: CO 2 and O 2 dynamics in leaves of aquatic plants with C 3 or CAM photosynthesis – application of a novel CO 2 microsensor
doi: 10.1093/aob/mcy095
Figure Lengend Snippet: Dynamics of CO2 and O2 partial pressures in the sediment inhabited by Lobelia dortmanna and Littorella uniflora kept in a 14 h light and 10 h dark cycle (A) or a 12 h light and 12 h dark cycle (B) but here with two oxygen traces showing different values but overall similar in pattern. The CO2 and O2 microsensors were inserted 3 cm into the sediment half way between two neighbouring plants. Measurements were at 20 °C with the water column maintained at near air equilibrium of both CO2 (16 mmol m–3) and O2 (284 mmol m–3) and with a constant flow velocity of approx. 1–2 mm s–1. The plants were growing in a natural turf with a mixed community of L. dortmanna and L. uniflora; in light, the turf was illuminated with approx. 200 μmol photons m–2 s–1 at canopy height. The same data and additional replicates expressed in porewater concentration units of CO2 and O2 are shown in Supplementary Data Fig. S2.
Article Snippet: Sediment p O 2 was measured ( n = 10) using commercially available needle-embedded O 2 optodes (OXF500PT, Pyro Science GmbH, Aachen, Germany) connected to a REDFLASH meter (MicroOptode Meter, Unisense) and the signal was collected with a frequency of one sample per minute using data acquisition software (SensorTrace Suite 2.8, Unisense).
Techniques: Concentration Assay