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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Actin cytoskeleton in the extra-ovular embryo sac of Utricularia nelumbifolia (Lentibulariaceae)
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Actin cytoskeleton in the extra-ovular embryo sac of Utricularia nelumbifolia (Lentibulariaceae)

机译：乌拉特乌拉菌（小花aria科）卵泡外胚囊中的肌动蛋白细胞骨架

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摘要

The actin cytoskeleton in the mature female gametophyte of angiosperms has been examined in only a few dicot and monocot species. The main purposes of this study were to identify how the actin cytoskeleton is arranged in the mature extra-ovular embryo sac in Utricularia nelumbifolia (Lentibulariaceae). We found that the extra-ovular part of the central cell has a well-developed actin cytoskeleton: actin microfilaments formed of long strands which run longitudinally or transversally to the long axis of the embryo sac. The exerted part of the central cell, which is exposed to the environment of the ovary chamber, is highly vacuolated and in the thin peripheral cytoplasm possesses a complicated network of actin microfilaments. The epidermal cells of the placenta that are in contact with the extra-ovular part of the embryo sac are crushed. The ultrastructure data of these cells are presented. We detected the accumulation of the actin cytoskeleton between the micropylar parts of the synergids and the extra-ovular part of central cell. This actin accumulation is unusual because in typical angiosperms the micropylar parts of the synergids form the apex of the female gametophyte.
机译：仅在少数双子叶植物和单子叶植物物种中检查了被子植物成熟雌配子体中的肌动蛋白细胞骨架。这项研究的主要目的是确定肌动蛋白的细胞骨架是如何排列在乌拉氏菌（Lentbulariaceae）的成熟的卵外胚囊中的。我们发现中央细胞的卵泡外部分具有发达的肌动蛋白细胞骨架：由长链形成的肌动蛋白微丝，长链纵向或横向延伸至胚囊的长轴。暴露于卵巢腔室环境的中央细胞所施加的部分高度空泡化，并且在稀薄的外周细胞质中具有复杂的肌动蛋白微丝网络。与胎囊的卵泡外部分接触的胎盘的表皮细胞被压碎。显示了这些细胞的超微结构数据。我们检测到增效剂的小孔部分和中央细胞的卵泡外部分之间的肌动蛋白细胞骨架的积累。这种肌动蛋白的积累是不寻常的，因为在典型的被子植物中，协同子的毛孔部分形成雌配子体的顶点。

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