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合点端大孢子发育为胚囊母细胞。The chalazal end megaspore develops into the embryo sac mother cell.

大孢子母细胞减数分裂产生直线形大孢子四分体。The megaspore mother cell meiosis to form a linear megaspore tetrad.

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在大孢子母细胞分裂产生的四个孢子中，三个会解体消失。Of the four products of a megaspore mother cell, three usually abort.

反映大孢子发育和贮粉室发生的同步性。This shows a synchronous development of megaspore and pollen chamber.

四分体线行排列，合点端的大孢子发育为蓼型胚囊。The chalazal megaspore of a linear tetrad develops into a polygonum type sac.

功能大孢子位于合点端，大孢子发育为蓼型胚囊。Function megaspore is in the chalaza and the monosporic embryo sac is chenopodiad type.

珠心表皮下的雌性孢原直接发育为大孢子母细胞。The archesporial cell below nucellus epiderm functions directly as the megaspore mother cell.

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大孢子排列为直线型，合点端大孢子为功能大孢子。Arrangement of megaspore is linear shaped, the megaspore of chalazal end is functional megaspore.

大孢子母细胞减数分裂形成直线型四分体。Successive cytokinesis in the megasporocyte follows meiosis and the megaspore tetrads are linear.

大孢子孢原进行平周分裂，产生一个周缘细胞和一个造孢细胞。The megaspore archesporium splits circumference, it circumferential edge cell and a sporogenous cell.

二倍体功能大孢子的合点端细胞壁内的胼胝质荧光消失。As development goes on, callose fluorescence disappears in the chalazal wall of diplosporous functional megaspore.

二倍体功能大孢子的合点端细胞壁内的胼胝质荧光消失。As development goes on, callose fluorescence disappears in the chalazal wall of diplosporous functional megaspore.

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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。In theterosporous species, a distinction is usually made between megaspore mother cells and microspore mother cells.

一旦功能大孢子分化，合点和珠孔端细胞中多糖增加。The polysaccharides in the cells of micropylar and chalazal end increases with the formation of functional megaspore.

孢原细胞处于珠心表皮之下，直接起大孢子母细胞的功能。A single archesporium differentiates immediately below the nucellar epidermis, it functions directly as the megaspore mother cell.

根据大孢子母细胞的发育特性，将被子植物的二倍体孢子生殖分为8种类型，不同类型的胚胎学机制各不相同。According to the developmental characters of the megaspore mother cells, diplospories in angiosperms were divided into 8 types, viz.

同时在珠心细胞中观察到旺盛的分裂活动和细胞团的形成，这可能是二倍体植株的来源。Embryological observation of ovary culture shows that haploid plants are from megaspore tetrad, while diploid plants are probably from nucellus cell.

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大胞子四分体线形排列，合点端大孢子为功能大孢子，胚囊发育类型为蓼型，具有特化的珠被绒毡层和承珠盘。Megaspore tetrad is linear. the chalazal megaspore develops into an embryo sac of polygonum type. Hypostase and special integument tapetum exist in the ovule.

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。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.

孢原细胞为表皮下3～4层细胞处的一个细胞，孢原细胞不经分裂直接发育成大孢子母细胞。The archesporial cell is a cell of 3￣4 layer cells under the nucellar epidermis, the archesporial does not undergo meiosis and becomes the megaspore mother cell.