^(60)Co-γ射线辐照大花君子兰种子对其萌发特性及其开花性状的影响

Effects of ^(60)Co-γ Rays Seed Irradiation on the Germination Characteristic and Flowering Traits of Clivia Miniata

采用60Co-γ射线对6个大花君子兰品种种子进行0、2、4、6、8Gy剂量辐照处理,研究辐照对其萌发特性及其实生苗开花性状的影响。结果表明:大花君子兰种子对60Co-γ射线辐照较为敏感,低剂量即可影响其萌发特性,60Co-γ射线对隔覆兰和佛光2个品种的半致死剂量为2～4Gy,对其余4个品种的半致死剂量为4～6Gy。6Gy内,剂量越高,变异率越高;各剂量辐照处理对延迟实生苗始花期,降低花葶高度,减小花序直径都有显著影响,但对影响小花数目无明显效果。60Co-γ射线对大花君子兰种子适宜的辐照剂量为4Gy,即能保证种子较高的萌发率,又具有较高的变异率,便于筛选新种质。

Seeds of 6 cultivars of Clivia miniata were irradiated under different irradation doses, 0, 2, 4, 6, and 8 Gy of ^60Co-γ rays to investigate the effects on the germination characteristic and flowering traits. Results indicated that the seeds of Clivia miniata were sensitive to the irradiation of ^60Co-γ rays and the germination characteristic could be affected by low dosage. The half lethal dosage of ＇ Gefulan＇ and ＇ Foguang＇ was 2 - d Gy, and 4 - 6Gy in other d cultivars, respectively. The higher dosages, the higher variation rate below 6 Gy. Significant impacts were observed on delaying flowering, reducing peduncle height and reducing inflorescence diameter by the irradiation treatment at each dosage. However, the number of floret was not obviously affected. In conclusion, 4Gy was considered the most favorable dosage afte treatment of ^60Co-γ rays irradiation on the seeds of Clivia miniata, which was able to guarantee a high seed germination rate and a high variation rate, so as to screen new germplasm more effectively.