关键词: 茉莉花, 插穗; ⁶⁰Co-γ射线, 半致死剂量

Abstract: In order to investigate the effect of 60 Co-γ irradiation on the survival rate,rooting number, longest root length and germination rate of Jasminum sambac cuttings,the cuttings from three cultivars of Jasminum sambac were respectively irradiated by five different irradiation doses.By fitting regression line between irradiation dose and relative survival rate of cuttings,we calculated the half lethal dose(LD₅₀) of Jasminum sambac.The results showed that the survival rate varied significantly with different cultivars.The LD₅₀ values of ⁶⁰Co-γ irradiation for cuttings of No.5(double flowers),No.8(double flowers) and No.23(semi-double flowers) were respectively 64.18,42.61,39.57 Gy.The rooting number of cuttings decreased significantly with the increase of irradiation dose(from 0 Gy to 60 Gy).The germination rate of cuttings decreased significantly with the increase of irradiation dose(from 30 Gy to 60 Gy).The survival rate and longest root length of cuttings decreased significantly with the increase of irradiation dose(from 40 Gy to 60 Gy).

Key words: Jasminum sambac;Cuttings, ⁶⁰Co-γ irradiation, Half lethal dose