It was found that callose appears in microsporangium at the microspore mother cell formation stage.

結(jié)果發(fā)現(xiàn)色呦呦视频网站，胼胝質(zhì)最早于小孢子母細(xì)胞形成期出現(xiàn)于花粉囊中久久精品国产11p。

At the early stage,spo- rogenous cells inside the microsporangium were seen grouping together into small aggregates each containing few cells.

由于不同的蘭花所形成的花粉塊的形狀和結(jié)構(gòu)有一定的差異性a免费视频\，這些性狀常被利用作分類之用〔3一習(xí)毛片无码在线看。

The primary sporogenous cells divided into the second sporogenous cells which would turn into microspore mother cells in a microsporangium. The cytokinesis in meiosis of the microspore mother cells was of modified simultaneous type, forming the decussate, isobilateral or T-shaped tetrads.

初生造孢細(xì)胞分裂形成次生造孢細(xì)胞www.国产在线视频.com，次生造孢細(xì)胞再轉(zhuǎn)化為小孢子母細(xì)胞免费的av网站在线观看国产精品，小孢子母細(xì)胞減數(shù)分裂的胞質(zhì)分裂為修飾性同時(shí)型，四分體排列方式為交叉型国产三级视频试看、對(duì)稱型或"T"型婷婷色香六月综合激情，成熟花粉粒二細(xì)胞型，開花時(shí)散出欧美性爱自拍拍。

microsporangium：小孢子囊

橫切面方形,孢子囊有兩種,大孢子囊(megasporangium)含 4 個(gè)大孢子,大孢子散布,萌發(fā)成雌配子體;小孢子囊(microsporangium)內(nèi)含多數(shù)小孢子, 小孢子萌發(fā)形成雄配子體.配子體的發(fā)育均在孢子壁內(nèi)發(fā)育.雌配子體的發(fā)育經(jīng)過游離核階段,

microsporangium：小孢子襄

microsphere 微球體 | microsporangium 小孢子襄 | microsporocyte 花粉母細(xì)胞

microsporangium：小芽胞囊

"裸螺菌屬,短螺菌屬","Microspira" | "小芽胞囊","Microsporangium" | "小芽胞癬菌屬","Microsporon"

Dianema microsporangium H.Z.Li & Y.Li：小囊散絲菌

散絲菌屬Dianema | 小囊散絲菌Dianema microsporangium H.Z.Li & Y.Li | 團(tuán)毛菌科Trichiaceae