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棉 花 学 报 Cotton Science 2008，20(1)：23-28
Influences of Simulated Acid Rain on Seed Germination and Seedling Physiological Characteristics in Different Colored Cotton Varieties Abstract：Seeds of five different colored cotton varieties were treated by simulated acid rain with different pH values, then the germination energy, percentage of germination, the contents of POD, SOD and soluble sugars were tested. The results indicated that the simulated acid rain with different values influenced the germination energy and percentage of germination of the five cottons to different degrees. The germination energy of five varieties was higher than that of the controls and decreased significantly with the falling of pH values; percentage of germination also decreased with the falling of pH values but lower than that of the controls. With the falling of pH values, POD activity firstly decreased and then increased, higher than that of the controls at last; but SOD activity was firstly increased and then decreased. This showed simulated acid rain had damnified the cells of cotton seedling, the SOD activity decreased irreversibly. Soluble sugars in leaves of five different colored varieties increased a little after treated by simulated acid rain. This showed the cotton seedlings had some capability to tolerate the stress of simulated acid rain. Simulated acid rain was harmful for cotton seed germination and influenced physiological characteristics of cotton seedling.
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