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 ×109ions/cm2到1×1014ions/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.
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