Photosynthetic Response Mechanism of Soil Salinity-Induced Cross-Tolerance to Subsequent Drought Stress in Tomato Plants.

As the Pm can reflect the activity of PS1 to some extent, the lack of significant difference in Pm between treatments at T1 and T5 illustrated a decreasing trend of H 2 O100, H 2 O50, and NaCl50 after subsequent drought stress, whereas the NaCl100 treatment exhibited a significantly higher Pm value than that of the other treatments at D5 ( Figure 2 D).

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