The anther possesses four microsparangia with its wall composed of four layers: epidermis, endothecium, middle layers and a 2\|nucleate celled tapetum.

絨氈層細胞在發(fā)育后期由單核分裂為2 核国内自拍日韩在线观看网站，多原位解體，為腺質型日韩变态福利网站在线观看；但大約有12％小孢子囊的絨氈層在小孢子四分體釋放時期進入花藥室內(nèi)免费黄色看直接网站，成為變形絨氈層。

2It is practical that triploid white poplars induced by the chromosome doubling of megaspore based on the development of microspore.

2通過小孢子發(fā)育進程參照系的設立图片区亚洲电影小说区，實現(xiàn)了大孢子染色體加倍誘導白楊三倍體技術的實用化亚洲区视频。

Results indicated : The meiosis stages of megaspore of white poplars are different, while there was a association between MMCs and PMCs meiosis in the same hybrid.

研究表明，不同白楊的大孢子母細胞減數(shù)分裂進程存在差異性色噜噜噜，而同一樹種的大强奸伦乱中文字幕、小孢子母細胞減數(shù)分裂進程存在時序性相關。

Now the research has made progress.(1) The meiosis stages of megaspore could be discriminated timely through observing the meiosis of microspore under the same environmental conditions, according to the association of female and male buds during development.

1首次提出利用雌黄片理论、雄花芽發(fā)育進程的時序性相關性韩国日本在线精品网站，以相同生境以及培養(yǎng)條件下的小孢子發(fā)育進程為參照，從而相對準確地實現(xiàn)白楊大孢子母細胞減數(shù)分裂進程即時判別的技術方法国产色无码视频免费。

Under the same environmental conditions when the meiosis of microspore mother cell develop into tetrads the female buds were dipped duly with colchicine solution, which guaranteed that chromosome doubling of megaspore in white poplar could be accomplished in a short time. So much workload was cut down, and induction efficiency of triploid white poplars was also improved.

當相同生境以及培養(yǎng)條件下的小孢子母細胞減數(shù)分裂達到四分體后插女人逼视频，適時采用秋水堿溶液對雌花芽進行浸泡處理，可保證白楊大孢子染色體加倍處理能集中于一個較短的時間段內(nèi)進行一级特黄大片欧美久久久久百度，從而大大減輕了工作量火辣福利视频，同時提高三倍體誘導效率和效果。

Relationships between microspore stages and morphology of florets were observed.

結果表明： 1色妞色妞。確定了小花的形態(tài)學特征與小孢子發(fā)育時期的關系能够看黄的网站。

Microspore abortion of H9A occurred in the early uninucleate stage. The tapetum cells were in extreme hypertrophy so that tetrads were extruded to crack and break down and could not form normal uninucleate pollen grains; the abortion type was sporophyte.

結果表明，雄性不育材料H9A的小孢子敗育發(fā)生在單核前期国产乱人视频在线观看播放1，由于絨氈層細胞極度膨脹911A片导航，四分體受擠壓后破裂并降解，無法形成正常的單核花粉粒欧美1级，屬于孢子體敗育淫荡美女被强暴视频免费。

Dendrocalamus sinicus ; reproductive organs ; megasporogenesis ; microsporogenesis ; male gametophyte ; female gametophyte

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Thus the stamens of angiosperms and the microsporophylls of lower vascular plants are said to be homologous, being derived from a leaflike structure bearing the.

所以被子植物的雄蕊和低等維管植物的小孢子葉可以被稱為同源欧美二区在线综合亚洲欧美网站，源于產(chǎn)生小孢子囊的葉狀結構。

The Plant tissue raise is the plant sterile culture technology, has the totipotency theory according to the vegetable cell, the use plant body exsomatize organ (for example root, stem, leaf, stem point, flower, fruit and so on), the organization (for example cambium, epidermis, cerebral cortex, marrow department cell, endosperm and so on) or the cell (for example big spore, small spore, somatic cell and so on) as well as the protoplast, in aseptic and suitable artificial culture medium and illumination, temperature and so on under artificial condition, can induce injuries the organization, not to decide the bud, the adventitious root, finally forms the complete adult plant the discipline.

植物組織培養(yǎng)即植物無菌培養(yǎng)技術欧美野外激情人成视频在线观看，是根據(jù)植物細胞具有全能性的理論免费黄色网站看亚洲，利用植物體離體的器官(如根、莖国产精品爱舒服、葉三级片黄色网站在线无码免费观看、莖尖一级a性色生活片毛片裸体美女、花、果實等)欧美性人、組織（如形成層欧美老年性爱、表皮、皮層女人18毛片水真多在线视频、髓部細胞久久精品日本3级视频、胚乳等）或細胞（如大孢子、小孢子欧美精品亚洲人成在线观看、體細胞等）以及原生質體日本特级黄大片一区二区三区，在無菌和適宜的人工培養(yǎng)基及光照、溫度等人工條件下黑人操屄，能誘導出愈傷組織、不定芽韩国日本欧美三级一级爱国产、不定根欧美成年人电影，最后形成完整的植株的學科。