摘要
生毛体与嗜锇颗粒是银杏 (Ginkgobiloba)精子细胞中最具有标志性的结构。生毛体是细胞质内一直径为 3～ 4μm的圆球形结构 ,它由一个电子致密的核心和由此向周边发散出的辐射状中心粒组成 ,致密核心上具有微管结构的弱电子染色区域 ,并有微管从生毛体延伸到细胞质。嗜锇颗粒直径为 1 0～ 2 0μm,呈圆球状 ,位于生毛体和细胞核之间 ,其相对的另一侧存在纤维颗粒体。在精子细胞质内 ,特别是嗜锇颗粒和生毛体周围线粒体、质体、内质网、高尔基体等细胞器丰富。银杏精子细胞核较大 ,在细胞核内 ,核仁结构呈球形 ,电子染色致密的颗粒区在周围 ,而纤维组分则在圆球的中间。在核膜表面布满了分布不均匀的核孔复合体。
Both blepharoplast and osmiophilic globule were characteristic structures to the spermatid of Ginkgo biloba.The blepharoplast of Ginkgo biloba ranged from 3～4 μm in diameter and consisted of a number of basal centrioles radiating from an electron dense core that contained electron lucent areas with microtubule structure. Microtubules extended radially from the blepharoplast into the cytoplasm.A large round osmiophilic globule with a diameter of about 10～20 μm,was located between the blepharoplast and the nucleus,while a filbrillogranular body in the cytoplasm was opposite to the osmiophilic globule.There were numerous mitochondria,plastids,endoplasmic reticulia and dictiosomes in the cytoplasm,particularly around the blepharoplast and the osmiophilic globule of sperm cells.The nucleus of spermatid in Ginkgo biloba was large and roundly elliptical in shape.The large spheroidal nucleolus was the most obvious structure in the nucleus .There were two regions in the nucleolus distinguished by TEM:A ring shaped granular component,which contained maturing ribosomal precursor particles;and a centrally placed fibrillar component.The nuclear pore complexes in the nuclear envelope were plentiful but not evenly distributed.
基金
欧共体科教组织经费资助项目
关键词
银杏
精子细胞
生毛体
细胞器
超微结构
Ginkgo biloba
Spermatid
Blepharoplast
Osmiophilic globule
