Surface rehydration kinetics
The kinetics of leaf rehydration via the surface was analyzed as described by Guzmán-Delgado et al. (2018). Leaves treated with FC and ABA and control leaves were allowed to slowly dehydrate to the mass corresponding to the target Ψ and recorded prior to treatment application. We randomly selected 25 leaves per treatment. However, leaves that reached mass values lower than those previously recorded were discarded. Thus, we performed measurements in 21, 22 and 25 FC, ABA and control P. dulcis leaves, respectively, and in 18, 22 and 23 FC, ABA and control P. communis leaves, respectively. Leaves with vacuum grease sealed petioles were individually suspended in a dark chamber at ~22 ºC connected to an ultrasonic humidifier producing submicron fog droplets. Leaves were taken out of the rehydration chamber after approximately 10, 20, 30, etc. min until Ψ was approaching to zero, and patted dry with paper towels. The mass and Ψ of each leaf were then measured. The area and DW of the leaves were measured after scanning and oven-drying, respectively. The cumulative amount of absorbed water and Ψ of each leaf were plotted against time and fit with modified exponential functions (Table 1 Supporting Information). The apparent hydraulic resistance to flow (R) between the water source (wet leaf surface, ΨH2Osource = 0) and rehydrating tissues was calculated from Ohm’s equation as R = Ψ/Q, where Q is the instantaneous flux of water into the leaf calculated as the first derivative of the mass gain function. Confidence intervals and tests of hypothesis were performed by residual bootstrapping with R.