Fig. 2
From: CAM plasticity in epiphytic tropical orchid species responding to environmental stress
Changes in Fv/Fm ratio in C. rochussenii (a), C. mayeriana (b), B. membranaceum (c), B. vaginatum (d), D. leonis (e), and P. cornu-cervi (f) over 21 weeks under drought and well-watered treatments at two different growth irradiances. Vertical bars represent standard error. Different letters above bars indicate statistical difference (Tukey’s multiple comparison, p < 0.05, n = 3)