Systematic salt tolerance-related physiological mechanisms of wild soybean and their role in the photosynthetic activity and Na<sup>+</sup> distribution of grafted soybean plants

Systematic salt tolerance-related physiological mechanisms in roots and shoots of halophyte Dongying wild soybean have not yet been thoroughly studied. In this study, photosynthesis, modulated 820-nm reflection, chlorophyll a fluorescence, Na+ distribution cultivated (Gmc) (Gsw) leaves grafted plants were investigated after NaCl treatment. Results showed that the decreases photosynthetic rate, performance index, active P700 content, plastocyanin reduction significantly greater Gsw than those Gmc leaves. The observed increases concentration likely responsible for severe decrease activity plants. We suggest accumulation roots, which prevents transport from to shoots, effectively maintains at comparatively low level prevent destruction apparatus by salt.