With higher concentrations of exogenous MeJA under saline–alkali stress, the tolerance of tomato seedlings initially exhibited an increasing trend followed by a decrease ( Fig. 1A ).
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<i>SlWRKY80</i>-mediated jasmonic acid pathway positively regulates tomato resistance to saline-alkali stress by enhancing spermidine content and stabilizing Na<sup>+</sup>/K<sup>+</sup> homeostasis.
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