Fig. 7
From: CAM plasticity in epiphytic tropical orchid species responding to environmental stress
Changes in proline concentration in the leaves of C. rochussenii (Cr), C. mayeriana (Cm), B. membranaceum (Bm), B. vaginatum (Bv), D. leonis (Dl) and P. cornu-cervi (Pc) after 1 and 7 weeks of drought and after 14 weeks of re-watering under moderate light (a) and low light (b). Vertical bars represent standard error. Different letters above bars indicate statistical difference (Tukey’s multiple comparison, p < 0.05, n = 4)