X、γ辐射对雨生红球藻超微结构的影响

用雨生红球藻作为试验材料 ,从超微结构变化角度研究了X、γ射线的致突变效应 ,结果表明 :X、γ射线辐照能引起细胞膜受损 ,细胞的原生质球偏移 ,核仁出现电子稀疏区域 ;叶绿体粘连成团 ,类囊体条断裂 ,电解质外渗 ;核糖体增多 ;线粒体个体增大 ,线粒体膜受损。X射线辐照能引起淀粉鞘出现空隙和马蹄形蛋白核形成 ,内质网变少。γ射线辐照能引起淀粉鞘消失 ,滑面内质网增多 ,高尔基体增多增大。X、γ射线辐照引起的细胞核、线粒体、叶绿体等细胞器的损伤 ,可能是造成突变的原因。

EFFECT OF X-AND γ-IRRADIATION ON THE ULTRASTRUCTURE OF Haematococcus pluvialis

Effects of X- and γ-irradiation on the ultrastructure change of Haematococcus pluvialis has been studied.The results show that X or γ irradiation causes different damages on different cell organelles such as the cytolemma be lacerated,the bioplasm excursed,the area of thin electronin occurred in nucleus,the chloroplast lacerated,the thylakoids ruptured,the ribosome increased, the plastosome inflated and its membrane lacerated. In addition, X-irradiation causes perforation of starch sheath , decrease of SER and inducing of lycotropal pyrenoid. γ-irradiation causes dissolving of starch sheath,increase of SER and inflation of golgi body.The mutation effects of X- and γ-irradiation on the cell are probably caused by the laceration of some cell organelles like nucleolus,chloroplast and plastosome.