As the drought treatment progressed, the values for net photosynthetic rate (Pn) and stomatal conductance (Gs)
declined gradually at 60 and 100% irradiance.
However, under 25% sunlight Pn and Gs declined faster than those exposed to more intense irradiance,
Pn value was close to 2 μmol m–2 s–1, and Gs was about 0.01 mmol m–2 s–1 on day 6 after withholding water (Fig. 3-A and C).
The status of intercellular CO2 concentration (Ci) decreased slightly for all light conditions in the first 6 days,
but the decrease was more significant in shaded leaves. In the prolonged drought treatment, the Ci value decreased in 100% irradiance and remained almost unchanged at 60 and 25% sunlight (Fig. 3-E).
When the leaf RWCs were >75%, with identical RWC points, Pn and Gs displayed the highest values under 100% sunlight
when compared to 60 and 25% sunlight (Fig. 3-B and D).