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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Structure and biogenesis of ribonucleoprotein bodies in epidermal cells of Caragana arborescens L
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Structure and biogenesis of ribonucleoprotein bodies in epidermal cells of Caragana arborescens L

机译：CARAGANA arborecens的表皮细胞中核糖核蛋白体的结构和生物发生

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摘要

Epidermal cells of leaf petioles, pedicles, and sepals in Caragana arborescens L. are characterized with a unique biogenesis of intracellular bodies, the presence of which continues during 10-12 days in spring, from budding till flowering and fruit inception. Initially, a nuclear body is formed as a derivative of the nucleolus at the beginning of elongation of the protodermal cells, whereas a cytoplasmic body is formed in the proximity of the nuclear envelope later. Nuclear bodies and cytoplasmic bodies do not contain DNA, lipids, and starch, and they consist of RNA tightly packaged with proteins mainly in the form of short thin fibrils with thickness of 6 nm. By the end of cell elongation and the beginning of differentiation, nuclear bodies disappear, while cytoplasmic bodies become surrounded by a homogenous zone (halo). Later, the bundles of parallel-oriented fibrils derived from the body radially pass through the homogenous zone and gradually disperse in the cytoplasm. In the differentiated epidermal cells, no traces of cytoplasmic bodies are observed; there is only one nucleolus in the nucleus. It is hypothesized that cytoplasmic bodies may function as an RNA depot, which is utilized later in cell metabolism during the formation of fruits and seeds.
机译：叶片叶片，椎弓根和萼片的表皮细胞具有特征在于细胞内体的独特生物发生，其存在在春季的10-12天内继续，从萌芽和果实初始化。最初，核体形成为核仁在原子细胞伸长的开始时形成的衍生物，而在核包封的接近后形成细胞质体。核体和细胞质体不含DNA，脂质和淀粉，它们由用蛋白质紧密包装的RNA组成，主要以短薄的原纤维的形式，厚度为6nm。在细胞伸长率和分化的开始时，核体消失，而细胞质体变得被同质区域包围（卤素）。后来，源于体径向通过均相区域并逐渐分散在细胞质中的平行取向原纤维的束。在分化的表皮细胞中，没有观察到细胞质体的痕迹;细胞核中只有一个核心。假设细胞质体可以用作RNA贮库，其在果实和种子的形成期间在细胞代谢中使用。

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