Effects of H2S and rhizobia on photosynthetic parameters of soybean plants under water deficiency
As shown in Fig. 3A and 3D, Pn and Tr were obviously increased by Q8 and Q8+NaHS treatments under the three water conditions. With the decrease of water content, the Pn and Tr of four treatments had a slight downward trend, especially for Q8 and Q8+NaHS treatments, they were significantly decreased under SW condition compared with that the NW condition (Fig. 3A and 3D). With the decrease of water content, the Gs were substantially reduced by Q8 and Q8+NaHS treatments. However, under the same water condition, the Gs were markedly enhanced by Q8 and Q8+NaHS (Fig. 3B). Under same water conditions, the apparent increase of the Ci was observed by Q8 and Q8+NaHS treatments (Fig. 3C). Under same water conditions, Ls was greatly reduced by Q8 and Q8+NaHS treatments compared with that of the control, but no significant difference of the trend of the four treatments was observed under different water conditions (Fig. 3E). In addition, the change trends of WUE were similar to Ls. The difference was that the Q8 and Q8+NaHS treatments displayed a tendency to increase initially and then decrease, but WUE was not markedly changed by control plants (Fig. 3F).