Effects of H2S and rhizobia on Chlorophyll fluorescence parameters of soybean plant under water deficiency
With the decrease of water content, ETR and PSII displayed a tendency to increase initially and then decrease by control plants. By Q8 treatment, ETR and PSII were straight down with the decrease of water content. However, ETR and PSII were reduced by NaHS and Q8+NaHS treatments under MW condition (Fig. 4A and B). Among the three water conditions, the NPQ was increased in different degrees by Q8 and Q8+NaHS treatments, and the NPQ of control treatment increased with the decrease of water content, but the NPQ did not greatly affect under other treatments (Fig. 4C). Among the three water conditions, Fv/Fm was conspicuously increased by Q8 and Q8+NaHS treatments in soybean leaves. With the decrease of water content, the Q8 and Q8+NaHS treatments partially rescued the decrease of Fv/Fm in soybean leaves (Fig. 4D).