Seed Germination and Seedling Growth of the Two Sorghums under Saline-alkaline Stress

The effects of complex saline-alkaline stress on seeds germination and seedling growth of the fiber sorghum and common sorghum were studied in detail.The features of salt-alkalinized were simulated using 15 kinds of alkali-saline conditions with different salinities and pH obtained by mixing NaCl,Na2SO4 and NaHCO3 in various proportions.The results showed that the germination rate increased in the low alkali-saline environment;the germination rate and germination index of two Sorghums significantly decreased with the increasing of salt concentration and pH values.The accumulative germination rate of fiber sorghum were higher than that of common sorghum,which indicating that fiber sorghum's adaptation to saline environment were slightly higher than that of common sorghum.In the process of sorghum seedling growth,the effects on the growth of radical length and shoots length of various mixed salts with different alkalinities were similar.With the increasing of salt concentration and pH,shoot length,radical length of seedlings were significantly decreased.The results showed that the salinity has highly significant effect on germination percentage,germination index,shoot length of two sorghums and the interaction of salinity and pH has highly significant effect on radical length.