60Co-γ辐射对牡丹种子发芽率及幼苗生长的影响

为了研究牡丹辐射诱变育种,探讨牡丹种子辐射剂量问题,选育具有较高经济价值的中国现代牡丹优良新品种,以混合授粉的牡丹种子为试验材料,采用不同剂量60Co-γ射线辐射牡丹种子的方法对牡丹种子发芽率及幼苗生长的影响进行了研究。结果表明：辐射剂量为8.73~17.46 Gy时,种子发芽率随剂量的增加而提高,17.46 Gy时发芽率最高达到46%。随辐射剂量的增加,在17.46~52.38 Gy时发芽率开始降低。辐射剂量为17.46 Gy时,牡丹种子的出苗率（92.4%）、苗高（6.65 cm）达到最高,但辐射剂量对根长没有明显影响。

Effect of 60Co-γ Ray Radiation on the Seed Germination Rate and Growth of Paeonia suffruticosa Seedling

The seeds of Paeonia suffruticosa were radiated by the different dosages of 60Co-γ ray, and the seed germination rate and seedling growth were observed, which were to lucubrate radioactive breeding of Paeonia suffruticosa, which were to resolve radiation dosages of Paeonia suffruticosa, and which were to select choiceness and new variety of Paeonia suffruticosa having economy value. The results showed that the seed germination rate increased along with the increase of radiation dosage at 8.73-17.46 Gy, and 17.46 Gy was tiptop, but the seed germination rate decreased at 17.46-52.38 Gy. The emergence rate, seedling height, and root length of seeds which were radiated were higher than CK. The emergence rate was 92.4%, and seedling height was 6.65 cm when radiation dosage was 17.46 Gy. Radiation could promote seedling growth and could make the germination rate increased. 17.46 Gy was suitable for the peony seeds based on the influence of germination rate and seedling growth. There was no obvious effect on the root length by the dosage of 60Co-γ ray.