悬铃木种子^(60)Coγ辐照及其苗期生物学性状调查

EFFECTS OF ^(60)Co γ-RAYS RADIATION ON BIOLOGICAL CHARACTERS OF Platanus acerifolia Willd.SEED AND SEEDLINGS

以不同剂量的60Coγ射线辐射悬铃木干种子,测定不同剂量对悬铃木M1代的影响。结果表明,在50~400Gy辐射范围内,随着剂量的增加,悬铃木种子的萌发率、出苗率、成苗率降低,株高、鲜重、根长也明显下降。辐射对幼苗生长的抑制作用极显著,50~250Gy处理各组出真叶期比对照组依次推后2、5、9、14d。300~400Gy处理组虽有发芽,但幼芽严重扭曲,15d后逐渐死亡。通过对悬铃木辐射组与对照组成苗率和根长进行比较,初步推测悬铃木辐射的半致死剂量为50Gy,辐照诱变的适宜剂量为50至250Gy。

The dry seeds of Platanus acerifolia Willd. were irradiated by different doses of ^60Coγ-rays, and the effect of the radiation on M1 were investigated. Results showed that the seed germination rate, emerged seedling rate and survival seedling rate of Platanus aceriflia Willd. decreased with dose increase at the dose of 50- 400Gy, as well as the plant height, fresh weight and length of root. The radiation inhibited the seeding growth significantly. Compared with CK, the true leaf emerging time of samples irriadiated at 50 - 250Gy was late for 2, 5, 9 and 14d, respectively. But the young seedlings of samples treated at 300 - 400Gy were severely twisted and abnormal, and gradually died after 15d. Based on the data of seeding rate and root growth, it is concluded that the semi-lethal radiation dose of Platanus acerifolia Willd. dry seed was 50Gy, and the suitable dose range for radiation breeding was 50 to 250Gy.