【摘要】 [目的]确定荞麦种子发芽的适宜甲基磺酸乙酯(EMS)诱变剂量,为进一步获得荞麦优良性状并培育符合EMS诱变育种需求的新品种打下坚实的基础。[方法]以山西省当地的苦荞[Fagopyrum tataricum(L.)Gaertn]品种晋荞麦4号种子为材料,用不同浓度梯度(0.3%、0.5%、0.7%、1.0%、1.5%、1.7%)EMS诱变处理不同时间(4、8、12 h),分析苦荞种子发芽率和发芽势。[结果]随着EMS诱变剂浓度的增加,晋荞麦4号种子发芽势、相对发芽势和发芽率、相对发芽率均呈下降趋势,当EMS浓度为0.3%~1.0%时与对照没有显著差异,当EMS浓度为1.5%和1.7%时与对照差异极显著EMS处理48 h对晋荞麦4号种子发芽率、相对发芽率都没有大的影响,当处理时间为12 h时,与对照有显著差异;对于发芽势和相对发芽势,这3个处理时间没有显著差异。[结论]EMS诱变苦荞的半致死的适宜浓度为1.7%,适宜的处理时间为12 h。更多还原

【Abstract】 [Objective] This study aimed to determine the optimum ethyl methane sulfonate(EMS) concentration for germination of tarary buckwheat seeds so as to lay a solid foundation for obtaining excellent traits of tarary buckwheat and breeding new varieties that meet the requirements by EMS mutation breeding. [Method] The seeds of Jinqiaomai No.4, a local tarary buckwheat variety [Fagopyrum tataricum(L.) Gaertn] in Shanxi Province, were used as the material. They were mutagenized by different concentrations(0.3%, 0.5%, 0.7%, 1.0%, 1.5%, 1.7%) of EMS for different times(4, 8, 12 h). Then the germination rate and germination vigor were analyzed. [Result] With the increase of EMS mutagenic agent concentration, the germination vigor, relative germination vigor, germination rate and relative germination rate are all trended to be decreased. When the EMS concentrations ranged from 0.3%to 1.0%, there were no significant differences between treatment and control groups(P>0.05). When the EMS concentrations were 1.5% and 1.7%, significant differences were shown between treatment and control groups(P<0.01). The 4 and 8 h treatment of EMS all had no significant effects on germination rate and relative germination rate of Jinqiaomai No.4, but the 12 h treatment of EMS showed significant effects. Among the three treatment times, there were still no significant differences in germination vigor and relative germination vigor between treatment and control groups. [Conclusion] The optimum median lethal dose and treatment time of EMS for mutagenizing Jinqiaomai No.4 were 1.7% and 12 h, respectively.更多还原