摘要
采用不同剂量(0~300 Gy)的60Co-γ射线辐照乌拉尔甘草(Glycyrrhiza uralensis)种子,研究辐照处理对乌拉尔甘草种子在不同浓度Na2SO4(0~400 mmol·L-1)胁迫下发芽率、累积发芽率和发芽指数的影响,以期筛选出能够提高乌拉尔甘草种子耐盐性能的最佳辐射剂量。结果表明,随着盐浓度的升高,种子的发芽率和发芽指数呈下降趋势,发芽时间延迟,高盐浓度溶液对种子萌发率的影响较为强烈。但60Co-γ辐照处理的乌拉尔甘草种子在高盐环境中的萌发率(GP=12.22%)极显著(P=0.00)高于对照(GP=0)。说明60Co-γ辐照处理确实能够有效提高乌拉尔甘草种子在Na2SO4胁迫下的发芽率,尤以经100 Gy辐照处理的乌拉尔甘草种子作用效果最好,对Na2SO4胁迫表现出了较好的耐性。
In order to select the optimum60Co-γ radiation dose to improve salt-tolerance of Glycyrrhiza uralensis,the present study explored the effects of60Co-γ radiation on seed germination,accumulated germination percentage and germination index of G.uralensis under different Na2SO4 stress treatments.The results showed that seed germination percentage and germination index decreased and germination time delayed with the increase of salt concentration.However,seed germination percentage of G.uralensis exposed to60Co-γ radiation and then treated with high Na2SO4 stress was significantly higher than that of control,which indicated that60Co-γ radiation could effectively improve seed germination percentage under Na2SO4 treatments.These results suggested that different60Co-γ rays radiation should be employed based on the concentration of Na2SO4 in soil.Especially,seeds of G.uralensis exposed to the 100 Gy radiation treatment showed higher tolerance to Na2SO4 stress.
出处
《草业科学》
CAS
CSCD
北大核心
2015年第3期421-426,共6页
Pratacultural Science
基金
国家自然科学基金项目(31360047)
关键词
药用甘草
种子
发芽率
发芽指数
Glycyrrhiza uralensis
seeds
germination percentage
germination index
