The double embryo sac is a new type of variation in rice,chartered with a large embryo sac inlaid with a small embryo sac,overlapping in theirmicropyle part,and with the eggs far from micropyle part.

雙套結(jié)構(gòu)胚囊是一種新發(fā)現(xiàn)的胚囊，主要特點是含有大小兩個相嵌的胚囊和遠離珠孔端的卵細胞日韩精品免费AⅤ片在线观看。

Pollination The transfer of pollen from the anther to the stigma in angiosperms, and from the sporangiophores to the micropyle in gymnosperms.

授粉：指在被子植物中花粉從花粉囊轉(zhuǎn)移到柱頭上97亚洲色图，在裸子植物中從小孢子囊轉(zhuǎn)移到珠孔。

The quantities of starch grains in the two"cells"in micropyle part of embryosac gradually decrease and become unclear.With the further development of embryosac the starch grains in the central cell and antipodal cell disappear in succession,however,the egg cell does not.

在準極核移向胚囊中部前后日亚洲无码四区，不同的功能性細胞有不同的表現(xiàn)无码黄色视频大全，珠孔端的兩個"細胞"淀粉粒數(shù)量逐漸減少并變得不明顯，隨著胚囊的進一步發(fā)育91视频九色，其中中央細胞和反足細胞內(nèi)的淀粉粒相繼消失亚洲中文字幕无码乱线，但卵細胞內(nèi)卻一直保存著。

In the functional cell such as archesporial cell,megasporocyte,dyad,tetrad and youngmegaspore,among which the three cells close to micropyle end do not degeneratewholly,no clear starch grains were observed as well as in the embryo sacs from singlenucleate embryo sac to 8-nucleate one just forming.

淀粉粒變化有規(guī)律性可以观看的黄色网页，在孢原細胞黄色片你懂的、大孢子母細胞、二分體、四分體和早期的大孢子（即四分體中近珠孔端的3個細胞未完全退化）等功能性細胞中未觀察到明顯的淀粉粒。

This observation does not support the idea that the obturator mainly serves the function of mechanical guidance for the growth of pollen tubes.

我們不支持先前研究者關(guān)于珠孔塞主要充當對花粉管生長的機械作用的觀點欧美性爱啊啊啊啊。

Synergid cells Two haploid cells located near the egg cell at the micropylar end of the embryo sac in flowering plants.

助細胞：存在于開花植物胚囊內(nèi)欧美精爱视频，是位于珠孔端的卵細胞兩側(cè)的兩個單倍體細胞。

It takes about 0.5 h for a pollen tube from germination to arrive at the micropyle. About 0.5 h after pollination, the pollen tube releases two sperms into one synergid. At 0.5-2.5 h after pollination, the egg cell fuses with one sperm to form a zygote. About 10.0 h after pollination, the division of the zygote begins. The duration of the zygote lasts about 2.5-10.0 h. However, one sperm nucleus fuses with two polar nuclei at 1.0-3.0 h after pollination, and 5.0 h after pollination the primary endosperm nucleus begins to divide.

水稻受精過程經(jīng)歷的時間表如下：授粉后，花粉在柱頭萌發(fā)；花粉萌發(fā)至花粉管進入珠孔大約需要0.5小時；授粉后0.5小時左右欧美日劲，花粉管進入一個助細胞，釋放精子禁18在线观看免费视频；授粉后0.5-2.5小時日韩口爆，精卵融合形成合子欧美性爱在线免费观看视频；授粉后約10.0小時，合子第1次分裂谁有免费黄色网站直接看的，合子期為授粉后2.5-10.0小時网站涩涩；授粉后1.0-3.0小時，精核與兩極核融合欧美色综合网站在线看；授粉后約5.0小時7777在线视频，初生胚乳核分裂。

The quantities of starch grains in the two"cells"in micropyle part of embryosac gradually decrease and become unclear.With the further development of embryosac the starch grains in the central cell and antipodal cell disappear in succession,however,the egg cell does not.

在準極核移向胚囊中部前后A片免费视频A级，不同的功能性細胞有不同的表現(xiàn)亚洲精品偷拍第2页，珠孔端的兩個&細胞&淀粉粒數(shù)量逐漸減少并變得不明顯，隨著胚囊的進一步發(fā)育2021国产精品偷窥盗摄，其中中央細胞和反足細胞內(nèi)的淀粉粒相繼消失www.色色色色，但卵細胞內(nèi)卻一直保存著。

The archegonial initials could be distinguished from the perip heral cells at the micropyle end of the female gametophyte before the completion of the wall formation where the cell wall had reached the center of the gametop h yte.

雌配子體中游離核之間細胞壁還未完全形成時日韩AV无码精品久久人妻，在其近珠孔端表面可看到頸卵器母細胞發(fā)生国产真人一级A爱做视频。

Caruncles are often waxy or oily.

種阜通常是蠟狀或油狀的，由胎座涩涩视频欧美精品，珠孔，或纖維形成国产毛片自拍。