Ultrastructural observations of the mature megagametophyte and the fertilization in wheat (Triticum aestivum)
Ultrastructural observations of the mature megagametophyte and the fertilization in wheat (Triticum aestivum)
复制标题
DOI：
10.1139/b85-019
复制
发表时间：
1985-02
期刊：
影响因子：
1.1
通讯作者：
R. You;W. Jensen
中科院分区：
文献类型：
--
作者：
R. You;W. Jensen
小麦成熟胚囊的卵器位于珠孔端，由一个卵细胞和两个助细胞组成，中央细胞中部有两个大的极核，合点端有一团20 ~ 30个反足。对胚囊各细胞的超微结构特征进行了比较。这些特征包括细胞核和液泡的位置，细胞器的数量、结构和分布，以及每个细胞周围的细胞壁的范围。花粉管从珠孔通过丝状器进入助细胞。花粉管的侵入和排出使助细胞进一步退化，助细胞在授粉前就已经发生了变化。第二个助细胞在第一个助细胞被花粉改变的管穿透后外观没有进一步改变。在20-25 °C下授粉后半小时，在卵细胞和中央细胞的细胞质中可以看到两个雄性细胞核。授粉后1小时左右。
The mature embryo sac of wheat contains an egg apparatus composed of an egg cell and two synergids at the micropylar end, a central cell with two large polar nuclei in the middle, and a mass of 20 to 30 antipodals at the chalazal end. A comparison was made of the ultrastructural features of the various cells of the embryo sac. The features included the position of the nucleus and vacuoles, the number, structure, and distribution of organelles, and the extent of the cell walls surrounding each cell. The pollen tube enters one synergid through the filiform apparatus from the micropyle. The penetration and discharge of the pollen tube causes the further degeneration of that synergid, which had already undergone changes before pollination. The second synergid does not change further in appearance following the penetration of the first by the pollen-altered tube. Half an hour after pollination at 20–25 °C, two male nuclei are seen in the cytoplasm of the egg and the central cell. At about 1 h after pollination...