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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Presence of small-nuclear-ribonucleoprotein-containing nuclear bodies in quiescent and early germinating Zea mays embryos
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Presence of small-nuclear-ribonucleoprotein-containing nuclear bodies in quiescent and early germinating Zea mays embryos

机译：静止和早期萌芽的玉米胚中含有小核糖核蛋白的核小体的存在

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摘要

Nucleolus-associated bodies (NABs) occur in interphase nuclei of many plant species. The present work shows that, in Zea mays, NABs are present in dry seeds as well as in germinating tissues. The frequency of these nuclear bodies remains more or less constant during the first 24 h of imbibition but decreases significantly during the next 24 h. By the time the nucleolus reaches maturation and contains granular zones, these bodies are still found in close association with the surface of this organelle, as is the case in mature root meristematic cells. Immunocytochemical observations on both dry seeds and germinating tissues further revealed that NABs reacted positively with a monoclonal antibody (mAbK121) recognizing the m3G cap of sn(small nuclear)RNAs. It is, therefore, concluded that the NABs present in such tissues already contain components characterizing snRNPs (small nuclear ribonucleoproteins) in mature tissues. The possible function of NABs as storage deposits of snRNPs in dry seeds and early germinating tissues is discussed. In view of their many similarities with the coiled bodies described in both animal and plant cells, it is most likely that NABs correspond to those structures. [References: 47]
机译：核仁相关体（NAB）出现在许多植物物种的相间核中。目前的工作表明，在玉米中，NAB存在于干燥种子和发芽组织中。这些核体的频率在吸取的最初24小时内或多或少保持恒定，但在接下来的24小时内显着降低。到核仁成熟并包含颗粒区时，仍然发现这些小体与该细胞器的表面紧密相关，就像成熟的根分生组织细胞一样。对干种子和发芽组织的免疫细胞化学观察进一步表明，NAB与识别sn（小核）RNA的m3G帽的单克隆抗体（mAbK121）发生了阳性反应。因此，得出的结论是，存在于此类组织中的NAB已包含成熟组织中表征snRNPs（小核糖核糖核蛋白）的成分。讨论了NABs作为snRNPs在干燥种子和早期发芽组织中的储存沉积物的可能功能。鉴于它们与动植物细胞中描述的盘绕体有很多相似性，因此最有可能的是NAB对应于那些结构。 [参考：47]

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