Fig. 4

Changes in ETR (a–f), qP (g–l) and NPQ (m–r) of the six species after 2 and 7 weeks of drought and after 14 weeks of re-watering under moderate light. Vertical bars represent standard error. The letters at the end of the curves indicate statistical difference in ETR, qP and NPQ either between weeks 2 and 7 (letter a), or between 7 weeks of drought and after 7 weeks of drought with 14 weeks of re-watering (letter b), One-way ANOVA, p < 0.05, n = 3. No letters at the end of the curve indicate no significant difference