megaspore

1. In dandelion ( Taraxacum), for example, the chromosomes of the megaspore mother cell remain in one cell after the first meiotic division, forming a restitution nucleus.
   例如在蒲公英中，在第一次减数分裂后，大孢子母细胞的染色体仍在一个细胞中，形成一个再组核。
2. Our main results were as follows: the ovary of male I degenerated and disappeared quickly upon megaspore tetrad degeneration, and developed into macrosporocytes;
   结果发现：色木槭一期雄花（雄I）在大孢子四分体退化形成功能性大孢子时期，子房萎缩并迅速退化消失；
3. The gametophyte is derived from the product of a reduction division in the megaspore mother cell.
   该配子体是由大孢子母细胞进行减数分裂而来。
4. Embryological studies of megaspore abortion of eating triploid banana
   三倍体食用蕉大孢子败育的胚胎学研究
5. In theterosporous species, a distinction is usually made between megaspore mother cells and microspore mother cells.
   在异型孢子体种类中，可区分为大孢子母细胞和小孢子母细胞。
6. There is only one layer of parietal cells at the stage of sporogenous cell, megaspore mother cell and tetrad.
   造孢细胞，大孢子母细胞和四分体时期，周缘细胞仅1层。
7. Ultrastructural Studies on Megaspore Formation in Ginkgo biloba
   银杏大孢子形成的超微结构研究
8. It appears however that the formation of megaspore tetrad associated with the high GA3/ ZT ratio.
   高水平的ZT/IAA有利于大孢子母细胞和花粉粒的形成，而大孢子四分体的形成则需要高的GA3/ZT比值。
9. Thick callose deposits in the walls of degenerative megaspores, while little in the wall of functional megaspore.
   退化的大孢子细胞壁胼胝质荧光明显，功能大孢子细胞壁上缺少胼胝质荧光。
10. The study of pollen fertility of different types, the effect of fertility on the fruitage performance, and the observation of the genesis and development of megaspore, female gametophyte and embryo by paraffin method were conducted in the research.
    采用石蜡切片方法，观察不同类型番木瓜大孢子、雌配子体以及胚胎的发生和发育；研究育性对植株结实性能的影响。
11. This shows a synchronous development of megaspore and pollen chamber.
    反映大孢子发育和贮粉室发生的同步性。
12. No callose fluorescence shows in the wall of mononuclear embryo sac after its formation, while thick callose deposits in the wall of the degenerative megaspore.
    单核胚囊形成后，其细胞壁内无胼胝质荧光，而退化的大孢子细胞壁胼胝质荧光显著。
13. The Morphology and Structure of Female Cone and the Formation of Megaspore and Female Gametophyte in Golden Larch
    金钱松雌球花的形态构造及大孢子和雌配子体的形成
14. The development and formation of microspore or microgametophyte are all earlier than those of megaspore and megagametophyte.
    小孢子发生及雄配子体发育均早于大孢子发生及雌配子体发育。
15. Cytokinesis in the MMC accompanies meiosis and the megaspore tetrads are linear or T-shaped.
    大孢子四分体为直线形或T形排列。
16. The nuclear plasm of megaspore and 2 and 4 nucleate embryosac shows a positive Feulgen reaction.
    大孢子母细胞及二、四核胚囊的核质显示Feulgen正反应。
17. Arrangement of megaspore is linear shaped, the megaspore of chalazal end is functional megaspore.
    大孢子排列为直线型，合点端大孢子为功能大孢子。
18. The polysaccharides in the cells of micropylar and chalazal end increases with the formation of functional megaspore.
    一旦功能大孢子分化，合点和珠孔端细胞中多糖增加。
19. The megaspore mother cell undergoing meiotic divisions produces a T-shaped, or, rarely, linear tetrad.
    大孢子母细胞减数分裂产生T形四分体和少数线形四分体。
20. The archesporium in its pistils directly developed into megaspore mother cells, which later divided into macrospores through meiosis.
    孢原细胞直接发育成大孢子母细胞，然后大孢子母细胞减数分裂形成大孢子。
21. Two hours after pollination, the third mitosis of megaspore completes in CK of BP;
    授粉后2h，蕾期授粉的对照已经完成大孢子的第三次有丝分裂；
22. The archesporial cell below nucellus epiderm functions directly as the megaspore mother cell.
    珠心表皮下的雌性孢原直接发育为大孢子母细胞。
23. A large amount of starch deposit found in functional megaspore and nucellar cells are presumably as the nutrient source in the developmental process of embryo sac.
    可能有助于营养物质进入胚囊。4.功能大孢子中贮存丰富的淀粉粒，它和珠心细胞一起是胚囊发育时的营养来源。
24. Primary sporogenous cell forms directly megaspore mother cell.
    初生造孢细胞直接形成大孢子母细胞。
25. The megaspore had 3 consecutive mitosis, and the formed of eight-nucleate polygonum type embryo sac. 4.
    大孢子经过3次连续的有丝分裂，形成8核的蓼型胚囊。
26. The megaspore mother cell undergoes meiosis to form four megaspore in line.
    大孢子母细胞经过两次减数分裂形成四个大孢子，沿胚珠长轴排成一列，即线形四分体。
27. ( 2) It is practical that triploid white poplars induced by the chromosome doubling of megaspore based on the development of microspore.
    通过小孢子发育进程参照系的设立，实现了大孢子染色体加倍诱导白杨三倍体技术的实用化。

noun

1. larger of the two types of spore produced in heterosporous plants

   Synonym:    macrospore