Fig. 5.

Titratable acidity at dusk (red) and dawn (blue) in stems of Sesuvium portulacastrum grown in 2.5-l pots in non-saline soil under full sunlight. The experiment was performed during January/February 2017. Samples were randomly taken from eight plants. Data are shown for well-watered plants, droughted plants (6 d without irrigation), and plants that had been droughted and rewatered (7 d with irrigation). The data are expressed on the basis of (A) fresh mass, and (B) dry mass, and are means (±SD) (n=4 stems; at a given time-point each stem was harvested from a different plant). P-values from one-tailed t-tests are shown.