These events included the migration of microspores and vegetative nucleus and a polar pollen engorgement process.

在小孢子液泡化后期在线看片免费人成视频久网不卡，小孢子核和細(xì)胞質(zhì)遠(yuǎn)離小孢子萌發(fā)孔和絨氈層呈極性分布。

Megaspore mother cell just enters leptotene as The meiosis of microspore mother cell develop into tetrads . The meiosis of megaspore mother cell develop into pachytene while that of microspores develop into a single nuclear adjacent to cell wall.

當(dāng)白楊小孢子母細(xì)胞減數(shù)分裂至四分體時(shí)最新国产美女口暴深喉，大孢子母細(xì)胞開(kāi)始進(jìn)入減數(shù)分裂細(xì)線期人人操天天操老太大逼人人操；而當(dāng)小孢子發(fā)育至單核靠邊期上時(shí)，大孢子母細(xì)胞減數(shù)分裂達(dá)到粗線期hs视频网站。

In seed plants also produce spores, and spores are profiled in the ovule Pearl hearts a megaspore mother cell produces large spores by meiosis in the anthers of the microspore mother cells produced by meiosis of microspore.

在種子植物中也產(chǎn)生孢子一片黄网站，且均為孢子異型，在胚珠的珠心中的1個(gè)大孢子母細(xì)胞經(jīng)減數(shù)分裂產(chǎn)生大孢子毛片网站无码，在花藥中的小孢子母細(xì)胞經(jīng)減數(shù)分裂產(chǎn)生小孢子国产区影院。

Microspore Ye as the feather, small sporophyll sac formed by the polymerization, each polymer capsules formed by four small sporangia, small spores with dual airbags, and airbag Pinaceae pollen is similar to large sporophyll from the central axis and arranged in Brachypodium feather composition, Each Yibing has a shell bucket, each bucket containing shell upright ovules 10-12 months.

小孢子葉枝為羽狀，小孢子葉由聚合囊組成国产黑丝自拍，每個(gè)聚合囊由4個(gè)小孢子囊組成日韩欧美一，小孢子具雙氣囊，與松科植物花粉的氣囊相似欧美成a人v，大孢子葉由中軸及羽狀排列的短柄組成99网一级A片在线免费播放，每一柄上有一個(gè)殼斗，每個(gè)殼斗內(nèi)有10—12個(gè)直立的胚珠曰木男女一级A片免费视频。

The observation showed that sterile plants and fertile plants in the pollen mother cell stage is not very different, when microspore mother cells of male sterile plants enter meiosis period, it could form normal tetrad cell , tetrad cell is normal in early development stage, In the uninucleate microspore stage , tapetal cells were vacuolization, the microspores were extruded to the middle by tapetal cells.

本研究利用石蠟切片法cao99，結(jié)合光學(xué)顯微鏡技術(shù)對(duì)櫻桃蘿卜核質(zhì)互作雄性不育系的不育株和對(duì)應(yīng)保持系可育株的花藥發(fā)育過(guò)程進(jìn)行細(xì)胞形態(tài)學(xué)觀察www视频一区，觀察結(jié)果表明：不育株與可育株在花粉母細(xì)胞時(shí)期差別不大，不育株的花藥小孢子母細(xì)胞進(jìn)入減數(shù)分裂期后精品自拍自产一区二区三区高清，可以正常的形成四分體亚洲色片在线观看，四分體前期發(fā)育正常，而在單核小孢子期絨氈層細(xì)胞出現(xiàn)液泡化丝袜足交美腿，絨氈層細(xì)胞向中間擠壓小孢子久久综合热riav。

The results show that the normal process begins with archesporial cell and undergoes stages of primary and secondary sporogenous cell,microspore mother cell,dyad,tetrad,central nucleus microspore,vacuolated microspore,mature microspore,twocell pollen and threecell mature pollen.

對(duì)平流層輻射處理SP3谷子和對(duì)照CK3谷子雄性細(xì)胞發(fā)育的研究表明，雄性細(xì)胞正常發(fā)育過(guò)程從孢原細(xì)胞開(kāi)始日本黄色视频在线免费观看，經(jīng)初生造孢細(xì)胞激情开心网站国产、次生造孢細(xì)胞、小孢子母細(xì)胞国产色色免费、二分體91色噜噜狠狠狠狠色综合、四分體和單核小孢子中央期、單核小孢子液泡期欧美日韩图区、單核小孢子成熟期直到二細(xì)胞花粉男女综合网、三細(xì)胞成熟花粉結(jié)束。

The reproductive development process of birch was described as follows: Male inflorescences extended from apical bud in early June. In later June, stamen primodium was differentiated in the bract of male inflorescence and the differentiation of bract was generated in female inflorescence. During July, anther layers and archesporial cell were differentiated in anther, then archesporial cell developed into mother microspore cell. Pistil primodium came into being at the same time. In early part of August the meiosis of mother microspore cell started. In later August, mono-nucleus microspore was formed. After September, both male inflorescence and female inflorescence were dormant.

白樺的生殖生長(zhǎng)發(fā)育過(guò)程如下：6月初日韩在线最新专区，雄花序從頂芽中生長(zhǎng)出來(lái)乱伦小说图片视频。6月中下旬，雄花序苞片上分化出雄蕊原基黄色美女视频网址，雌花序分化出苞片三级片网站免费观看。7月，雄花花藥分化出花藥壁和孢原細(xì)胞精品久久久一级黄片，孢原細(xì)胞演化為小孢子母細(xì)胞免费看A片视频偷窥，雌花序苞腋處分化出雌蕊原基；8月中上旬18分钟处破之轻点好痛，小孢子母細(xì)胞減數(shù)分裂一极一黄一区，8月下旬形成單核小孢子；9月后雄花序以單核小孢子狀念越冬欧美多人操逼，雌花序以雌蕊原基狀念越冬日批视频免费看40分钟。

The results showed that the sex ratio of trees was 1 m 2 f, and the natural T. cuspidata tree was able to sexually reproduce for many years. Male trees had fecundity when the diameter at breast height ranged from 1.5 cm to 92 cm, while female trees had fecundity when the DBH from 9.5 cm to 68.1 cm. Male trees typically flowered at the age about 20 years earlier than female trees. The numbers of microstrobili were 3 times more than that of megastrobili, and only 1/10 megastrobili developed into seed. The numbers of strobili and seed were correlated with DBH, crown diameter and height of trees; however, no significant correlations were observed with other site factors. Numbers of strobili decreased from the upper to lower canopy layers, while the quantity of seed decreased from the middle, upper to lower canopy layers. Seed-setting rate increased from the upper to lower canopy layers. Numbers of strobili and seeds in different directions of the canopy were not uniform, but the differences weren't significant.

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Paraffin slides observation found that the microspore of the RNMS line failed to vacuolate after its morphogenesis, disassembled and disappeared at last. After microspore morphogenesis, the breaking down of tapetum cells was delayed until microspore breading down.

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The situation of abnormal development of male cells is as follows:microspore mother cell can't enter into meiosis because of intense vacuolation,shrink and disintegration of its cytoplasm;although vacuolated microspore mother cell can enter into meiosis,it can't form normal dyad and degenerate in the middle process;dyad and tetrad become vacuolated and can't develop normally;cytoplasm of microspore shrinks around the nucleus at the stage of central nucleus microspore,the shape of microspore is twisted into crescent or irregular shape,at last its cytoplasm and nucleus are disintegrated and crescent vacant microspore presents;nutritive substances can't be accumulated at the stage of vacuolated microspore,cytoplasm is disintegrated,and microspore turns into a big vacant pollen.

雄性細(xì)胞異常發(fā)育有幾種情況：小孢子母細(xì)胞強(qiáng)烈液泡化国产永久精品91在线，細(xì)胞質(zhì)收縮解體，不能進(jìn)入減數(shù)分裂欧美色欧美亚洲另类少妇；小孢子母細(xì)胞液泡化jizzz色多多，雖能進(jìn)入減數(shù)分裂，但不能形成正常二分體而中途退化男女拍拍拍AAA毛片免费视频；二分體www.一区二区三区.com、四分體細(xì)胞液泡化，不能進(jìn)行正常發(fā)育性插20分钟免费视频；單核小孢子中央期爆乳美女粉泬10p福利视频，細(xì)胞質(zhì)收縮包圍核，小孢子形狀扭曲呈月牙形或不規(guī)則形日韩片无码观看网站免费，最終細(xì)胞質(zhì)和核解體而呈月牙形的空殼小孢子久久这里只精品免费；單核液泡期的小孢子不能積聚營(yíng)養(yǎng)物質(zhì)，細(xì)胞質(zhì)解體而成為大的空殼花粉粒手机看片1024人妻金沙。

androspore：產(chǎn)雄器孢子,雄孢子,小孢子

androsporangium 雄孢子囊 | androspore 產(chǎn)雄器孢子,雄孢子,小孢子 | androsterone 雄(甾)酮

microspore：小孢子

多數(shù)蕨類(lèi)植物產(chǎn)生的孢子在形態(tài)大小上是相同的,稱(chēng)為孢子同型(isospore),少數(shù)蕨類(lèi)如卷柏屬和水生真蕨類(lèi)的孢子大小不同,即有大孢子(macrospore)和小孢子(microspore)的區(qū)別,稱(chēng)為孢子異型(Heterospore).

microspore：小芽胞 小孢子

microsporangium 小孢子囊 | microspore 小芽胞 小孢子 | microsporemothercell 小孢子母細(xì)胞

microspore culture：小孢子培養(yǎng)

microspore 小孢子 | microspore culture小孢子培養(yǎng) | microspore mother cell小孢子母細(xì)胞

Microsporon：小孢子菌屬

Microsporidia 小孢子蟲(chóng)目 | Microsporon 小孢子菌屬 | Microsporum 小孢子菌屬

microsporosis：小孢子菌病

microsporophyll 小孢子葉 | microsporosis 小孢子菌病 | microsporosisflava 黃色小孢子菌病

Microsporum：小孢子癬菌

皮膚癬菌分為毛癬菌(Trichophyton)、表皮癬菌(Epidermophyton)和小孢子癬菌(Microsporum)3個(gè)屬. 3個(gè)屬真菌都能形成有隔菌絲,在沙保培養(yǎng)基上容易生長(zhǎng),形成絲狀菌落,產(chǎn)生大分生孢子、小分生孢子及厚膜孢子. 根據(jù)菌落形態(tài)最新国产成人野战视频在线观看免费、孢子形態(tài)可進(jìn)行鑒別(表18-1).

Microsporum：小孢子癬菌屬

n) 小孢子癬菌屬(Microsporum) 21 1 15 + + + + + - + - + 表20-2 癬菌的培養(yǎng)特征 屬名 肉眼菌落外觀 鏡檢培養(yǎng)的真菌性狀顏色 大分子孢子 小分子孢子 厚膜孢子 菌絲特殊形態(tài) 毛癬菌 絨絮狀粉粒狀或蠟樣 灰白好好日无码视频、淡紅、紅三级做a全过程在线观看视频、紫男女www视频在线看网站、黃、橙天天操夜夜操一区,二区,三区,、棕 細(xì)長(zhǎng)棒狀,

Nosema：小孢子蟲(chóng)屬

復(fù)方新諾明對(duì)治療免疫 抑制患者的慢性感染有效.三,微孢子蟲(chóng) 微孢子蟲(chóng)(Microsporidium)屬微孢子門(mén),微孢子目.迄今從人體中至少已發(fā)現(xiàn)有 5 個(gè)屬的微孢子蟲(chóng), 它們是匹里蟲(chóng)屬(Pleistophora) ,小孢子蟲(chóng)屬(Nosema) ,腦炎微孢子蟲(chóng)屬(Encephalitozoon) ,

sporidium：孢子球/擔(dān)子孢子/小孢子

spore /胞子/孢/孢子/ | sporidium /孢子球/擔(dān)子孢子/小孢子/ | sporinite /孢壁煤素質(zhì)/