In theterosporous species, a distinction is usually made between megaspore mother cells and microspore mother cells.

在異型孢子體種類中欧美一级操，可區(qū)分為大孢子母細(xì)胞和小孢子母細(xì)胞αv中文字幕在线毛片免费。

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.

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Cytological observation was made,which indicated that microspore degeneration was a successive process.

比較研究了可育花及兩種類型的不育花小孢子發(fā)育的細(xì)胞形態(tài)學(xué)特征可以免费在线观看的A片，發(fā)現(xiàn)蘿卜小孢子敗育是個連續(xù)過程，在造孢細(xì)胞時期就已出現(xiàn)敗育跡象香蕉五月天色。

CaM mRNA was substantially expressed in thetapetum, stigma, pollen tube track, degenerated synergid and transfusion parenchymacells. Lesser but yet significant amounts of CaM mRNA were also localized in themicrospore mother cells, microspores, pollen, antipodal cells, egg cell and central cell.

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Histological study indicated that low temperature inhibited microspore formation and caused abnormal multiplication of tapetum layer cells.

經(jīng)切片觀察亚洲色图拍自拍，低溫會造成絨氈層細(xì)胞的異常增殖，及產(chǎn)生多核性巨大小孢子老师嗯啊好深再用力一点免费视频，而阻止小孢子發(fā)育一级a在线爱免费观看欧美。

From tetrad stage to microspore stage, the ABA content in sterile buds was higher than fertile buds.

四分體到小孢子單核期和小孢子二核后期至成熟花粉期不育花蕾ABA含量仍高于可育花蕾。

Using cytohischemical staining methods, with the results of comparison the dynamics of proteins and polysaccharides in the anthe wall cells and colule cells of different developmental phases in female and male flowers, the anormogenesis of anther tapetum in the inflecting phase of from bisexual flower to unisexual flower was observed. In microspore developed phase, the tapetum functions of preserving and transportingmutritive material for microspore development and of secreting callosal enzyme for decompositing callosal cell lost no normal guadrant formed, of being abnormal meiose of pollen mother cells, and then, the stamen aborted selectively in female flowers and pistil in male flower.

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Mature pollen grain is of 2 - celled type .

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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.

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The first split of microspore mother cell is observed after one week after beginning of temperature arised under high temperature but the split of secondary sporogenous cell doesn't be found. The split of secondary sporogenous cell is still found after one week but the first split of microspore mother cell is observed after 12d under low temperature. Formating speed of male gametophyte is affected by temperature.

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