Figure 3.

Initial fluorescence (F0) (A), variable fluorescence (Fv) (C), and quantum efficiency of photosystem II (Fv/Fm) (D) of soursop plants cv. Morada Nova as a function of the interaction between the salinity levels of irrigation water (ECw) and hydrogen peroxide concentrations, and maximum fluorescence (Fm) (B) as a function of the irrigation water salinity (ECw) at 210 days after transplantation. ns, * and ** are, respectively, not significant and significant at p ≤ 0.05 and ≤ 0.01 by the F-test. x and y correspond to ECw and hydrogen peroxide (H₂O₂) concentrations, respectively.