Fig. 4

Regression analysis of the maximal photochemical efficiency of PSII (△MR/MR₀) with probability that an electron moves beyond primary quinone (ETo/TRo, a) and PSII excitation pressure (1-qP, c) in Glycine max (closed symbols) and Glycine soja (open symbols). * Indicates that the correlation was significant at P < 0.01. The maximal photochemical efficiency of PSII (Fv/Fm, b) and ETo/TRo (d) in Glycine max and Glycine soja in the absence or presence of 3-(3,4-dichlorfenyl)-1,1-dimethylkarbonyldi-amid (DCMU) after 9 days of salt stress with 300 mM NaCl. For reagent treatment, the leaves after 6 days of salt stress with 300 mM NaCl were immersed in 0 or 70 μM DCMU for 3 h in the dark. The data of Fv/Fm (b) and ETo/TRo (d) indicate the mean of five replicates (±SD), and different letters on error bars indicate significant difference between DCMU treatment and control at P < 0.05