Method: The method of cell and tissue culture was utilized to carry out an observation on the cytopathy effect(CPE) led by influenza virus FM1 with the aerosol of different concentrations in vitro.
方法：体外试验采用组织细胞培养法，观察不同浓度药物对流感病毒FM1病毒株致细胞病变（CPE）的作用；
Meristem tip culture of Sweetpotato can obtain virus-free plantlet. Storing the virus-free plantlet in vitro is economic and applicable at present.
由茎尖分生组织培养成无病毒苗并进行试管保存，是当前既经济又实用的方法。
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