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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >EVIDENCE FOR THE ROLE OF THE GLOMERULOCYTE IN CELLULOSE SYNTHESIS IN THE TUNICATE, METANDROCARPA UEDAI
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EVIDENCE FOR THE ROLE OF THE GLOMERULOCYTE IN CELLULOSE SYNTHESIS IN THE TUNICATE, METANDROCARPA UEDAI

机译：葡糖胞苷在卫城大叶甲壳膜中纤维素合成中的作用的证据

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The tunicate, Metondrocarpa uedia, contains a large quantity of cellulose; however, it is not known how and where the cellulose is synthesized. Based on evidence from electron diffraction and conventional thin-sectioning for electron microscopy, this study shows that the glomerulocyte is involved in the synthesis of cellulose. The bundles of microfibrils in the glomerulocyte as well as the tunic were identified as cellulose I using selected area electron diffraction analysis. The diffraction pattern of cellulose in the glomerulocyte was similar to that from the tunic, suggesting that the crystallization of cellulose already is initiated in the glomerulocyte. The diameter of cellulose microfibrils, both in the glomerulocyte and the tunic was the same, about 16 nm. These results suggest that the glomerulocyte is the most probable site for the synthesis of cellulose in the tunic of M. uedai. Using thin-sectioning techniques, a series of observations showed that individual microfibrils are primarily assembled in structures tentatively identified as vacuole-like structures, then they are bundled by a tapering region within the vacuole-like structures. These bundles of microfibrils are deposited in a continuously circular arrangement. The microtubules are oriented parallel to the bundles of microfibrils at the tapering vacuole-like structure, and they may be involved in the tapering of these structures (perhaps controlling the shape). This study also provides the first account for the involvement of a vacuole-like structure in the synthesis of cellulose microfibrils among living organisms. [References: 31]
机译：被膜，Metondrocarpa uedia，含有大量纤维素。然而，尚不知道如何和在哪里合成纤维素。基于电子衍射和常规电子显微镜薄切片的证据，这项研究表明肾小球细胞参与了纤维素的合成。使用选择的区域电子衍射分析将肾小球细胞和中山装中的微纤维束识别为纤维素I。肾小球细胞中纤维素的衍射图谱与中山药的相似，表明纤维素的结晶已经在肾小球细胞中引发。肾小球细胞和外套中的纤维素微纤维直径都相同，约为16 nm。这些结果表明，肾小球细胞是M. uedai外套中纤维素合成的最可能位点。使用切片技术，一系列观察表明，单个微纤维主要组装在初步确定为液泡状结构的结构中，然后由液泡状结构内的锥形区域捆扎在一起。这些微纤维束以连续的圆形排列沉积。微管在渐细的液泡状结构处平行于微纤维束定向，并且它们可能参与这些结构的渐细（也许控制形状）。这项研究还首次说明了液泡状结构参与了活生物体中纤维素微纤维的合成。 [参考：31]

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