Abstract:

The dry seeds of celery were irradiated by different doses of 60Co-γ ray, the effects of radiation on seed vigor and M1 seedlings physiological characteristics were investigated. The results showed the effect of 60Co-γ ray irradiation on three cultivars seeds were similar. When the doses of 60Co-γ ≥200 Gy, the germination and vigor of seed decreased remarkably. And there was no germination after irradiated by 300 Gy 60Co-γ. There was a negative effect of radiation on M1 seedlings. The M1 seedlings height declined with 50%-60% when the doses of 60Co-γ ≥200 Gy. When the doses were 50, 100, 150 Gy, the SOD, POD, APX, GR activity increased compare with 0 Gy , and there was not remarkable difference on O2ˉ? production rate and MDA content between 50, 100, 150 Gy 60Co-γ and 0 Gy 60Co-γ. However, when the doses of 60Co-γ ≥200 Gy, the SOD, POD, APX activity decreased remarkably and O2ˉ? production rate, MDA content increased remarkably. The 60Co-γ ≤150 Gy did not inhibit the growth of celery seedlings. Therefore, we concluded that the optimum doses of celery dry seeds was 100-150 Gy.