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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Development of mucilage cells of Araucaria angustifolia (Araucariaceae)
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Development of mucilage cells of Araucaria angustifolia (Araucariaceae)

机译：南洋杉粘液细胞的发育

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摘要

The roles of mucilage cells were investigated through morphological and cytological analysis during leaf development in young Araucaria angustifolia plants. Differentiation began in leaf primordia in the shoot apex, when the young cells underwent a greater increase in volume in comparison with other mesophyll cells. The mucilage polysaccharides were synthesized by dictyosomes, from where they were taken by large vesicles and released into a cavity formed by detachment of the tonoplast, which was separated from the cytoplasm. At the end of differentiation, the cell was completely filled with mucilage, a gel consisting of a denser reticular structure surrounding less dense regions. The nucleus and cytoplasm were degenerated in mature cells. The A. angustifolia mucilage cells presented some cytological resemblances to the mucilage cells of members of some dicotyledonous families; however, differences in the dictyosomes and the secretion route were observed. Translocation and water storage of solutes was suggested by the use of the hydroxy pyrenetrisulfonic acid tri-sodium salt apoplastic tracer. The tonoplast detachment, dechromatinization, nuclear condensation, and general degeneration of the membrane systems observed during maturity indicated a programmed cell death process, one not yet described for angiosperm mucilage cells.
机译：通过形态和细胞学分析在南洋杉年轻植物叶片发育过程中研究了黏液细胞的作用。与其他叶肉细胞相比，当年轻细胞的体积增加更大时，在茎尖的叶原基中开始分化。粘多糖是由​​单核小体合成的，从那里被大囊泡摄取，并释放到由液泡膜脱离形成的腔中，该液泡与细胞质分离。在分化结束时，细胞被粘液完全充满，粘液由围绕较不密集区域的较稠密的网状结构组成。核和细胞质在成熟细胞中退化。沙曲霉黏液细胞与某些双子叶植物家族的黏液细胞在细胞学上相似。然而，观察到双核小体和分泌途径的差异。通过使用羟基pyr三磺酸三钠质外塑性示踪剂表明了溶质的易位和储水。在成熟过程中观察到的液泡膜分离，脱色，核浓缩和膜系统的一般变性表明程序性细胞死亡过程，被子植物粘液细胞尚未描述。

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