盐胁迫对臭椿种子发芽的影响

Effect of Salt Stress on the Germination of Seed in Ailanthus altissima

分别采用0.0%、0.2%、0.4%、0.6%、0.8%、1.0%NaCl溶液对臭椿种子萌发进行胁迫处理,结果表明：随着NaCl浓度的升高,臭椿种子的发芽率、发芽势、发芽指数、活力指数均呈下降趋势;种子萌发后幼苗的苗高、根长、叶绿素含量也呈下降趋势;游离脯氨酸含量呈平稳下降后在NaCl浓度达到0.6%时又呈上升趋势;超氧化物歧化酶（SOD）和过氧化物酶（POD）活性变化差异极显著。臭椿种子发芽可忍耐0～0.4%的NaCl胁迫环境,发芽幼苗生长可忍耐0～0.6%的NaCl胁迫。

Through different NaCl concentrations （0.0% ,0.2% ,0.4% ,0.6% ,0.8%, 1.0% ） treating the seed and seedling of Ailanthus ahissima during their germination and growth period. The result showed that with the increasing of NaCl concentration, the germination percentage, germination potential, seed germination index and vigor index, seedling height growth, root growth ahd chlorophyll content were all decreased, the proline content was decreased first, then increased gradually when NaCl concentration up to 0.6% ,the variations of SOD and POD activity of the seedling leaf were significant. In conclusion, the seed ofA. ahissima germination showed some salt resistance characteristics that could stand the salt stress of 0% to 0.4%, the seedling of A. ahissima growth could stand the salt stress of 0% to 0.6%.