Study on the Salt Resistance of Seven Species of Wild Perennial Flowers in Northern China

Seven species of wild perennial plants were chosen as experimental materials, the salt resistance of these plants were studied. The salt matrix include NaCl and Na2SO4, the salt content is 0, 2.5 g·kg-1,5 g·kg-1 and 10 g·kg-1.The results showed that all the plants could not germinate with the salt of 10 g·kg-1.All these plants could germinate and grow in the saline soil with the salt content of 2.5 g·kg-1.In this treatment the most rate of germination was Viola prionantha（46.35% more than that of control）. When the salt content is 5 g·kg-1, only Iris lacteal, Taraxacum mongolicum,and Coronilla varia could germinate and grow,but the germination delayed, and the rate of germination decrease markedly. The salt treatment made the proline increased markedly,but less effect on soluble sugar when treated as 2.5 g·kg-1 or 5 g·kg-1. When the plants were treated as 5 g·kg-1, the content of MDA increased markedly.It suggested that it was seriously harmful to plants as salt content 5 g·kg-1.