Figure 3.
Similar drought-triggered changes in diel gas exchange are shared by Portulaca oleracea subspecies. (A) Net CO2 exchange of shoots of representative subspecies after 16 days of drought. (B-D) Net CO2 exchange by shoots of granulatostellulata in well-watered conditions (B), after the initial 10-day-period of water withholding (C), and after 20 days of drought and into rewatering (D). In (A–D), two-week-old individuals were used due to the size restriction of the cuvette. Also, data were normalized against the leaf area. Shaded areas indicate the dark period, red arrows indicate partial watering event (5 ml), and the blue arrow indicates full rewatering. Inserts schematically illustrate soil water content following water deprivation (see Methods for details), and the time points corresponding to the gas exchange measurements are highlighted in red.