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First, the authors mentioned that salt stress is one of the major environmental factors limiting plant growth. How serious is the salt stress problem in natural environmental system? What is the estimated salt concentration in natural system? How did the authors decide the concentration of NaCl used in this study?

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How serious is the salt stress problem in natural environmental system? What is the estimated salt concentration in natural system? How did the authors decide the concentration of NaCl used in this study?

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