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为了解家蚕微孢子虫保存方法对其侵染性的影响及大量获得细胞感染实验材料,将采用不同冻存液及冻存法处理的家蚕微孢子虫分别接种于家蚕胚胎细胞(BmE),调查家蚕微孢子虫对细胞的感染率及感染细胞的传代能力.与液氮直接冻存法处理和高温高压灭菌法处理的微孢子虫相比较,用液氮梯度冻存法处理的微孢子虫的粘附率和感染率均显著或极显著提高.采用液氮梯度冻存法以水作冻存液处理的微孢子虫对宿主细胞的感染率为64％,感染细胞能进行连续传代培养;而以含10％二甲基亚砜(DMSO)的胎牛血清作冻存液处理的微孢子虫虽然对宿主细胞的感染率达到80％,但感染细胞在培养7d后大量破裂死亡.因此,选用以水作冻存液经液氮梯度冻存法处理的家蚕微孢子虫有利于感染BmE细胞并在细胞内增殖,从而获得大量的细胞感染实验材料.“,”In order to study influence of preservation methods on Nosema bombycis infectivity and to acquire infected cells in large quantity for laboratory use,different cryoprotectants and different cryopreservation methods were employed to preserve Nosema bombycis spores which were then used to inoculate Bombyx mori embryonic cells (BmE).The infection rate of microsporidian spores and subculture generation of infected cells were investigated.Compared to microsporidian spores treated by liquid nitrogen direct cryopreservation and autoclaving,microsporidian spores treated by liquid nitrogen gradient cryopreservation had significantly or extremely significantly higher adherence rate and infection rate.Microsporidian spores treated by liquid nitrogen gradient cryopreservation using water as cryoprotectant had an infection rate of 64％ to host cells,and the infected cells could be continuously sub-cultured.Although the infectivity of spores preserved using 10％ dimethy sulfoxide (DMSO)-containing fetal bovine serum (FBS) as cryoprotectant had an infection rate as high as 80％,a great deal of the infected cells ruptured and died at 7 d post infection.Therefore,microsporidian spores treated by liquid nitrogen gradient cryopreservation using water as cryoprotectant have high proliferative rate in Bombyx mori embryonic cells,which can be utilized to prepare large quantity of infected cells for laboratory use.