Photosynthetica 2022, 60(3):400-407 | DOI: 10.32615/ps.2022.030

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

Z.C. XUE1, Y. WANG1, J. LIU2
College of Resources and Environmental Sciences, Innovative Research Center for Soil and Characteristic Plant Nutrition in Mountainous Areas of Northern Hebei, Hebei Normal University for Nationalities, 067000 Chengde Hebei, China College of Teacher Education, Hebei Normal University for Nationalities, 067000 Chengde Hebei, China2

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, and Na+ distribution in cultivated (Gmc) and wild (Gsw) soybean leaves of grafted soybean plants were investigated after NaCl treatment. Results showed that the decreases in photosynthetic rate, performance index, active P700 content, and plastocyanin reduction were significantly greater in the Gsw leaves than those in the Gmc leaves. The observed increases in the Na+ concentration in the Gsw leaves were likely responsible for the severe decrease in the photosynthetic activity of grafted plants. We suggest that Na+ accumulation in Gsw roots, which prevents the transport of Na+ from the roots to the shoots, effectively maintains the concentration of Na+ at a comparatively low level in the leaves to prevent the destruction of the photosynthetic apparatus by salt.

Additional key words: grafting; ion distribution; photosynthetic activity; salt resistance; wild soybean.

Received: March 29, 2022; Revised: June 8, 2022; Accepted: June 21, 2022; Prepublished online: July 11, 2022; Published: September 8, 2022  Show citation

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XUE, Z.C., WANG, Y., & LIU, J. (2022). Systematic salt tolerance-related physiological mechanisms of wild soybean and their role in the photosynthetic activity and Na+ distribution of grafted soybean plants. Photosynthetica, 60(3), 400-407. doi: 10.32615/ps.2022.030
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