Effects of drought and recovery treatments on photosynthesis and gas exchange. Values shown are mean ± standard error. ACO2: light saturated net photosynthetic rate; gs: stomatal conductance; iWUE: intrinsic water-use efficiency; ΦPSII: efficiency of photochemical quenching; qP: photochemical quenching. *indicates significant differences between drought and control treatments on d13 (at which point these were the only treatment). Significant differences at d14 (comparing three treatments) are indicated by lowercase letters; bars sharing a letter were not significantly different.