| Thousands of tons of deicing salt are applied to municipal roads in Northeast Chinaeach winter for years, but the mismanagement of accumulated snow has caused seriousenvironmental problems. At present, proper use and redevelopment of de-icing salt aretwo key issues focused by experts, scholars and government representatives. In thisstudy, we explored injury mechanism of tall fescue treated by deicing salt, especially thephysiological indexes on the seed germination of tall fescue influenced by differentconcentrations of de-icing salt, providing a reference for the reasonable use of thedeicing salt.In this experiment, determined were the germination rate, the germination potential,the root length, the shoot length, and relative salt damage in the seed germination, andseed-amylase activity, respiratory rate, the content of proline, soluble sugar and solubleprotein, and the protective enzyme system.The results show that de-icing salt stress inhibits the seed germination of tall fescue:with the rising concentration of deicing salt, a significant reduction was observed onroot length, shoot length, germination percentage, germination index and germinationpotential after the tall fescue seed germination, yet a significant increase on salt damage.With the high concentrations of de-icing salt stress, both soluble sugar content andamylase activity in the tall fescue seed first increased and reached the peak at8g. L-1,and then decreased significantly. With the increasing concentrations of de-icing salt,soluble protein content, respiratory rate, the rate of cyanide resistant respiration weresignificantly declining;on the contrary, the proline content was ascending and reached91.42twice as many as that without salt stress, which severely affected seedgermination.With the high concentrations of de-icing salt stress, SOD in the tall fescue seedmainly declined, and H2O2significantly ascended. Active oxygen content first decreasedand reached the bottom at8g. L-1, and then increased significantly. |
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