ULTRASTRUCTURE OF A COLONIAL RADIOLARIAN COLLOZOUM-INERME AND A CYTOCHEMICAL DETERMINATION OF ROLE OF ITS ZOOXANTHELLAE
ULTRASTRUCTURE OF A COLONIAL RADIOLARIAN COLLOZOUM-INERME AND A CYTOCHEMICAL DETERMINATION OF ROLE OF ITS ZOOXANTHELLAE
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DOI：
10.1016/0040-8166(76)90046-x
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发表时间：
1976-01-01
期刊：
影响因子：
2.6
通讯作者：
ANDERSON, OR
中科院分区：
文献类型：
--
作者：
ANDERSON, OR
C. inerme (Mueller) 是一种群落放射虫，含有大量结合在共同凝胶状基质中的细胞。这些细胞不具有在许多单细胞放射虫中观察到的骨架，但细胞质组织相似。这些细胞是多核细胞，是一个复杂的细胞过程系统，包含线粒体、高尔基体和从核区域辐射出来的众多液泡。内质通过称为纺丝的细细胞质链跨双膜边界与外质连接，其结构类似于单细胞放射虫中的结构。外质含有网状空泡，其中含有嗜锇物质。根足从胞质鞘中出现。有些是薄而致密的颗粒状。直径较大的根足含有密度较低的细胞质，隔离了虫黄藻，呈现出典型的甲藻精细结构。一些虫黄藻显然是培养出来的，因为当菌落在实验室的光照下培养数周时，有时会观察到它们分裂并持续大量存在。维持在黑暗中的菌落的虫黄藻数量减少，光学显微镜检查显示它们被吸入放射虫细胞的胞质中。对吸入外质鞘的虫黄藻进行电镜检查表明它们已被消化。 C. inerme 是简单细胞聚集体的一个显着例子，它利用其群体习性来培养藻类并将其用作食物，从而可能增强群体的生存能力。
C. inerme (Mueller) is a colonial radiolarian containing numerous cells bound in a common gelatinous matrix. The cells do not possess a skeleton as observed in many unicellular Radiolaria, but the cytoplasmic organization is similar. The cells are multinucleate and a complex system of cellular processes containing mitochondria, Golgi and numerous vacuoles radiate out from the nuclear region. The endoplasm is connected to the ectoplasm across a double membrane boundary by thin cytoplasmic strands called fusules whose structure resemble those in unicellular Radiolaria. The ectoplasm contains a lacy network of vacuoles containing an osmiophilic substance. Rhizopodia emerge from the ectoplasmic sheath. Some are thin and densely granular. Larger diameter rhizopodia containing less dense cytoplasm, sequester the zooxanthellae which present a typical dinoflagellate fine structure. Some of the zooxanthellae are apparently cultivated since they are sometimes observed dividing and persist in large numbers when colonies are cultivated under illumination for several weeks in the laboratory. Colonies maintained in the dark have a decline in number of zooxanthellae and light microscopic examination shows they are being drawn into the ectoplasm of the radiolarian cells. EM examination of zooxanthellae drawn into the ectoplasm sheath indicates they are digested. C. inerme is a remarkable example of a simple cellular aggregate that has exploited its colonial habit to culture algae and use them as food thus possibly enhancing the viability of the colony.