Some ultrastructural features of Volvox, with particular reference to the phenomenon of inversion
Some ultrastructural features of Volvox, with particular reference to the phenomenon of inversion
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Volvox 的一些超微结构特征，特别是反转现象
DOI：
10.1007/bf00388045
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发表时间：
1970
期刊：
影响因子：
4.3
通讯作者：
Jeremy D. Pickett
中科院分区：
文献类型：
--
作者：
Jeremy D. Pickett
本文描述了团藻超微结构的某些特征。高尔基体常与内质网（ER），和两个基体似乎伴随着两个probasal体。少数营养细胞为双核。所有检查的细胞有一个微管的外周细胞骨架，这是特别发达的精子包的细胞。在一个集落的倒置过程中，细胞显著伸长，可能是由于这些外周微管的长度增加;细胞轮廓也在弯曲集落的内边缘变窄。细胞质连接是大的，许多年轻的coenobia，但一般不存在于老年人的营养菌落;倒置，他们已成为局限于叶绿体端的细胞，他们似乎作为铰链。ER的元素贯穿这些相互连接，可能提供了一个细胞间的通信网络所需的协调活动的逆转。一个新的结构特征被发现在这些细胞质连接周围的质膜上的圆形（或可能是螺旋形）条纹的形式。它们在反转之前是可检测的，并且在反转之后立即最明显。
Some features of the ultrastructure ofVolvoxare described. Golgi bodies were often associated with the endoplasmic reticulum (ER), and the two basal bodies appeared to be accompanied by two probasal bodies. A few vegetative cells were binucleate. All cells examined had a peripheral cytoskeleton of microtubules which was particularly well developed in the cells of sperm packets. During inversion of a colony, the cells elongated considerably, possibly due to the increased length of these peripheral microtubules; the cell profile also became some-what narrowed at the inner edge of the flexing colony. Cytoplasmic connections were large and numerous in young coenobia, but were generally absent in older vegetative colonies; by inversion, they had become confined to the chloroplast end of the cells where they seemed to act as hinges. Elements of the ER ran through these interconnections, possibly providing an intercellular communication network needed for the coordinated activity of inversion. A new structural feature was discovered in the form of circular (or possibly spiral) striations on the plasmalemma around these cytoplasmic connections. They were detectable just before inversion, and were most pronounced immediately after.