Extended Data Fig. 6: Photochemical integrity of photosystem II as indicated by FV/FM.
Values are means (n = 4) ± 1 SE for the forest broad-leaf tree Celtis africana (left), the savanna tree Vachellia karroo (middle), and the C4 savanna grass Eragrostis curvula (right), meassured at five watering levels (80, 60, 50, 40 and 30% of pot capacity) followed by a recovery back to 80% and grown at either 200 ppm (Low), 400 ppm (Amb) or 800 ppm (Ele) [CO2]a. FV/FM was measured from pulse-amplitude modulated (PAM) chlorophyll fluorometry within the cabinets in the dark.
