Underlying Mechanisms for Growth Promotion by Low-Concentration Single Salt and Alkali Stresses and Growth Inhibition by Combined Salt-Alkali Stress in <i>Quercus mongolica</i>.

In contrast, for POD activity and MDA, SS and Pro contents exhibited an increasing trend, with the maximum values of POD activity, MDA, and SS contents recorded in the S 3 A 3 , representing 321.13%, 124.85%, and 127.48% increases compared to the CK, respectively.

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SP content showed a trend of increasing first and then decreasing, with its maximum value recorded in the S 1 group, a 31.94% increase relative to the CK, and its minimum value noted in the S 3 group, a 26.39% decrease relative to the CK ( Figure 1 ).

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Under combined saline-alkali stress with a fixed salt concentration, SOD activity, SP content, and CAT activity were all found to show a decreasing trend with increasing alkali concentration, with their minimum values detected in the S 3 A 3 and S 1 A 3 treatment, corresponding to a 60.50%, 68.06%, and 63.17% decrease compared to the CK, respectively ( Figure 1 ).

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