Figure 3. Changes in the chlorophyll content (A) and maximal photochemical efficiency of PSII (Fv/Fm) (B) in the leaves of watermelon (Citrullus lanatus) seedlings stored in the light (□) or in the dark (•) at 15°C.

Data in A are the means of five replicates, and data in B are the means of ten replicates. Standard errors are shown with a vertical bar. Asterisks indicate significant differences between treatments on a given day according to the Tukey test (P<0.05).