悬铃木种子~(60)Coγ辐照及其苗期生物学性状调查

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。

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

The dry seeds of Platanus acerifolia Willd.were irradiated by different doses of()~(60)Co γ-rays,and the effect of the radiation on M_1 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.