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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >ULTRASTRUCTURAL CHARACTERISATION OF CELLS SPECIALISED FOR NITROGEN FIXATION IN A NON-HETEROCYSTOUS CYANOBACTERIUM, TRICHODESMIUM SPP
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ULTRASTRUCTURAL CHARACTERISATION OF CELLS SPECIALISED FOR NITROGEN FIXATION IN A NON-HETEROCYSTOUS CYANOBACTERIUM, TRICHODESMIUM SPP

机译：非异质性蓝细菌，Trichodesmium SPP中用于固氮的细胞的超微结构表征

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摘要

Trichodesmium is the first described example of a filamentous cyanobacterium without heterocysts that contains cells specialised for nitrogen fixation. The ultrastructure of cells with and without nitrogenase were compared using primarily Trichodesmium tenue Wille, but also T. thiebautii Gomont and T. erythraeum Ehrenberg et Gomont. Immunohistochemistry demonstrated that the cytoplasm of certain cells was densely labelled with antibodies against Fe-protein (dinitrogenase reductase). Comparative TEM-image analysis revealed that these cells were also distinguished by a denser thylakoid network. dividing the vacuole-like space into smaller units. The nitrogenase-containing cells also exhibited less extensive gas vacuoles as well as fewer and smaller cyanophycin granules compared to cells which lacked nitrogenase. Carboxysomes were present in both cell types in equal proportion. Longitudinal sections showed that cells with nitrogenase were arranged adjacent to each other, and that groups of cells with and without nitrogenase may coexist in the same trichome. The correlation between modifications in ultrastructure and the presence of nitrogenase suggests a new type of cyanobacterial cell specialisation related to nitrogen fixation. The results obtained also question the systematic affiliation of the genus Trichodesmium. [References: 36]
机译：Trichodesmium是第一个描述的无异丝状蓝藻细菌的例子，其中含有专门用于固氮的细胞。主要使用ten毛线虫（Trichodesmium tenue Wille），T.thiebautii Gomont和T. erythraeum Ehrenberg等人比较了有和没有固氮酶细胞的超微结构。免疫组织化学表明，某些细胞的细胞质被抗铁蛋白抗体（二氮还原酶还原酶）密集标记。对比TEM图像分析表明，这些细胞还通过更密集的类囊体网络来区分。将类似液泡的空间分成较小的单元。与缺乏固氮酶的细胞相比，含固氮酶的细胞还表现出较小的气体空泡以及越来越少的蓝霉素颗粒。两种细胞中的羧基比例均等。纵向切片显示，具有固氮酶的细胞彼此相邻排列，具有和不具有固氮酶的细胞群可以共存于同一毛状体中。超微结构的修饰与固氮酶的存在之间的相关性暗示了一种与固氮有关的新型蓝细菌细胞特化。获得的结果也质疑了毛线虫属的系统隶属关系。 [参考：36]

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