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首页> 外文期刊>Canadian Journal of Zoology >Germ-line versus somatic cells. I. Stereological study of differentiating embryonic tissues of Tetrodontophora bielanensis (Hexapoda, Collembola)
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Germ-line versus somatic cells. I. Stereological study of differentiating embryonic tissues of Tetrodontophora bielanensis (Hexapoda, Collembola)

机译：生殖细胞与体细胞。 I.别兰拟齿拟齿猿（Tetrodontophora bielanensis）（Hexapoda，Collembola）分化胚胎组织的立体学研究

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摘要

We examined five different somatic tissues and compared them with germ-line cells to verify the "disposable soma" theory. Two embryonic stages and second-stage juveniles of Tetrodontophora bielanensis Waga, 1842 (Hexapoda, Collembola) were studied. Our results show that changes in relative volume of mitochondria during differentiation of cells correlate well with transformations of cell morphology. During morphological transformation of differentiating somatic cells, the relative volume of mitochondria in their cytoplasm is high, whereas in the differentiated tissues, this parameter is much lower. Surprisingly, the highest value of relative volume density of mitochondria is found in the cytoplasm of germ-line cells. If we accept that this parameter indicates the cell metabolism rate, then our results should be taken as supporting the "disposable soma" theory. It is also conceivable that the higher volume of mitochondria in the germ-line cells have nothing to do with energy production but, for instance, with the production or function of nuage material (germ-cell determinant) in the germ-line cells. These two possibilities are discussed.
机译：我们检查了五个不同的体细胞组织，并将它们与种系细胞进行比较，以验证“一次性体细胞”理论。研究了1842年河生的河豚Tetrodontophora bielanensis Waga的两个胚胎阶段和第二阶段的少年（Hexapoda，Collembola）。我们的结果表明，细胞分化过程中线粒体相对体积的变化与细胞形态的转化具有很好的相关性。在分化的体细胞的形态转化过程中，细胞质中线粒体的相对体积较高，而在分化的组织中，该参数要低得多。出乎意料的是，在种系细胞的细胞质中发现了线粒体的相对体积密度的最大值。如果我们接受该参数指示细胞代谢率，那么我们的结果应被视为支持“一次性体细胞”理论。还可以想象，生殖细胞中线粒体的体积较大与能量产生无关，例如与生殖细胞中成核物质（生殖细胞决定簇）的产生或功能无关。讨论了这两种可能性。

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