Figure 3.

Effects of different NaCl concentrations on the PAM parameters of the chlorophyll fluorescence in leaves of sorghum (Sorghum bicolor L. Shamal) and maize (Zea mays L., Kerala): the maximum quantum efficiency of PSII in the dark-adapted state, Fv/Fm (a); the maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PSII, Fv/Fo (b); the amount of closed PSII centers, 1-q_P (c); the excitation efficiency of open PSII centers, Φ_exc (d); the effective quantum yield of the PSII photochemistry, Fv’/Fm’ (e); the linear electron transport rate, ETR (f). Mean values (± SE) were calculated from 8 independent measurements. Different letters indicate significant differences for the respective parameters at p < 0.05 (uppercase for sorghum and lowercase for maize).