| Abstract: For the purpose of studying the effects of different dosage of nanomaterials (graphite phase carbon nitride) on the germination of lettuce seeds, fi ve treatments (0, 50, 100, 150 mg/L and 200 mg/L ) were set up, and Italian and Hongcuixiang lettuce were chosed as materials. The results showed that when the amount of nanomaterials was 50～150 mg/L, the germination potential, germination rate and germination index of the two lettuces were promoted. The germination rate and germination index of Italian lettuce were the highest treated by 100 mg/L. When the amount was 150 mg/L, the germination potential, germination rate and germination index of Hongcuixiang lettuce were the highest. When the amount of nanomaterial reached 200 mg/L, the promoting effect on the germination of lettuce seeds was reduced and even appeared the phenomenon of inhibiting germination. Higher dosage (150, 200 mg/L) of nanomaterials could promote root elongation. When the amount was 150 mg/L, the radicle length of Italian lettuce was the largest, which was increased by 24.80% compared with the control. When the amount was 200 mg/L, the radicle length of Hongcuixiang lettuce was the largest, which was increased by 37.20% compared with the control. The effect of applying nanomaterials on the length of the plumule was not obvious. In conclusion, when the amount of nanomaterials was 50～150 mg/L, the germination of the lettuce seeds were promoted. Higher dosage (150, 200 mg/L) of nanomaterials could promote radicle elongation. The effect of applying nanomaterials on the length of the plumule was not obvious. |