PT Journal
AU XUE, Z
   WANG, Y
   LIU, J
TI 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
SO Photosynthetica
PY 2022
BP 400
EP 407
VL 60
IS 3
DI 10.32615/ps.2022.030
WP https://ps.ueb.cas.cz/artkey/phs-202203-0009.php
DE grafting; ion distribution; photosynthetic activity; salt resistance; wild soybean.
SN 03003604
AB 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<sup>+</sup> distribution in cultivated (G<sub>mc</sub>) and wild (G<sub>sw</sub>) soybean leaves of grafted soybean plants were investigated after NaCl treatment. Results showed that the decreases in photosynthetic rate, performance index, active P<sub>700</sub> content, and plastocyanin reduction were significantly greater in the G<sub>sw</sub> leaves than those in the G<sub>mc</sub> leaves.  The observed increases in the Na<sup>+ </sup>concentration in the G<sub>sw</sub> leaves were likely responsible for the severe decrease in the photosynthetic activity of grafted plants. We suggest that Na<sup>+</sup> accumulation in G<sub>sw</sub> roots, which prevents the transport of Na<sup>+</sup> from the roots to the shoots, effectively maintains the concentration of Na<sup>+ </sup>at a comparatively low level in the leaves to prevent the destruction of the photosynthetic apparatus by salt.
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