关键词: 
存活曲线 /
含水种子 /
靶学说 /
自由基 /
拟南芥

摘要: 离子束辐照植物种子所产生的水自由基对植物种子存活率会有影响， 实验中为了观察这种辐射效应， 采用6.5 MeV能量的质子分别辐照拟南芥干种子和含水种子。 这个能量点的质子无论对干种子还是含水种子都可以完全穿透， 减少了因损伤部位不同带来的差异。 实验中采用的质子注量从4×109 ions/cm2到1×1014 ions/cm2。 实验结果显示干种子和含水种子存活曲线均成肩形下降趋势，而且含水种子下降注量点明显低于干种子。 这是自由基作用结果。 同时在辐射生物学靶学说的基础上， 建立了模型， 通过参数的合理设置，很好地拟合了实验数据。
The dry and watersaturated seeds of Arabidopsis thaliana were irradiated by H+ions with 6.5 MeV in atmosphere. The ion fluence used in this experiment was in the range of 4×109 —1×1014 ions/cm2. According to the structure of the seed and TRIM simulation， the ions with the energy of 6.5 MeV can penetrate the whole seed. The experiment shows that the fluenceresponse curves for the dry seeds and watersaturated seeds had distinct shoulders and reduced rapidly. The experimental results show that the waterimbibed seeds were more sensitive than the dry seeds and the reason is from free radicals reaction. A model has been constructed, and primely simulates the experiment data.