megaspore

The character of macrospore in development were as followed: anatropal ovule, basal placenta, thick nucellar, two integument, megaspore mother cell coming directly from archesporial cell, early degenerating antipodal cell, thedevelopment of the embryo sac being conformed as the polygonum type.

雌配子体发育的特点是：倒生胚珠、基底胎座、厚珠心、双珠被、孢原细胞直接长大成大孢子母细胞、反足细胞退化早，胚珠发育为蓼型。

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The chalazal megaspore of a linear tetrad develops into a polygonum type sac.

四分体线行排列,合点端的大孢子发育为蓼型胚囊.

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A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.

孢原细胞处于珠心表皮之下, 直接起大孢子母细胞的功能.

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Hypodermal archesporium is 2 or 3 cells; a single cell well developed into megaspore mother cell. Undergoes meiotic divisions, produces a linear tetrad.

大孢子孢原细胞2~3个，其中1个发育为大孢子母细胞，大孢子母细胞减数分裂形成直线四分体，合点端的大孢子为功能大孢子，珠孔端3个大孢子退化。

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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。

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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。

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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.

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。

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The megaspore mother cell develops into a linear tetral and the megaspore at chalazal end will become a functional megaspore but the rest at the microphyte end will not develop.

胚囊母细胞发育排成直线形的四分体，其中靠合点端的一个胚囊细胞将成为有功能的大孢子，但靠珠孔端的其余胚囊细胞则不发育。

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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。

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Embryological observation of ovary culture shows that haploid plants are from megaspore tetrad, while diploid plants are probably from nucellus cell.

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。

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Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.

大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.

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genesis of megaspore and development of embryo sac in carica papaya l .

番木瓜的大孢子发生与胚囊发育。

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