空间飞行和辐射对微藻光合系统影响的观察  

Studies on Effects of Spaceflight and Irradiation on Photosynthetic System of Microalgae

作　　者：王高鸿[1] 陈兰洲[1] 胡春香[1] 李根保[1] 陈坤[1] 李敦海[1] 刘永定[1] 

机构地区：[1]中国科学院水生生物研究所,湖北武汉430072

出　　处：《航天医学与医学工程》2005年第6期437-441,共5页Space Medicine & Medical Engineering

基　　金：中国科学院知识创新工程项目(KSCX2-SW-322);国家载人航天工程计划资助

摘　　要：目的研究空间飞行及辐射对微藻光合系统的影响。方法利用卫星搭载空间飞行、钴60的γ射线照射及地面对照黑暗培养微藻葛仙米,测定其存活率、光合活性、光合系统色素及观察藻细胞超微结构。结果空间飞行和射线处理后的微藻其存活率、光合活性发生显著降低,捕光色素明显降解、光合片层结构出现异常,同时空间飞行后微藻细胞外诱导出较厚的胶被。结论空间飞行及辐射均对微藻的光合系统产生损伤,但微藻可以通过结构上的改变对其进行适应。Objective To study the effect of spaceflight and radiation on the photosynthetic system of microalgae. Method Nostoc sphaeroides Kütz was brought on board retrievable satellite or irradiated with 5 000 Gy γ ray from ^60Co and cultured in dark as the control. Survival rate, photosynthetic activity, ration of photosynthetic pigment and ultrastructure of algal were observed after recover from the space or irradiation. Result After recovery from spaceflight or irradiation, the survival rate and photosynthetic activity, lysis of photo-harvesting pigments and anomality of thylakoids of photosynthetic system were found in the algae significantly, simultaneously a thick sheath was induced in the cells with spaceflight treatment. Conclusion Spaceflight and irradiation can injure photosynthetic system of the algae, but it can adapt to these stresses through changes in ultrastructure.

关 键 词：航天 辐射 微藻 光合系统 空间生物学 

分 类 号：Q693[生物学—生物物理学]