助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   bicellular pollens 的翻译结果: 查询用时:0.089秒
图标索引 在分类学科中查询
所有学科
更多类别查询

图标索引 历史查询
 

bicellular pollens
相关语句
  二胞花粉
     in bicellular pollens at the early stage the ribosomes increased in quantity and the mitochondria and plastids differentiated in their structure once again.
     在早期二胞花粉中,核糖体数量增加、线粒体和质体结构再度分化.
短句来源
  相似匹配句对
     ⑶The late bicellular pollen stage ,10 % of the pollens show aborted.
     (2 )败育度 ,细胞学上败育率达 10 0 % ,因为笔者所采的花蕾均在第五节位以上 ,此与形态学上第五节位上无荚果形成是一致的。
短句来源
     TEM Observation of the Pollens
     花粉的透射电镜观察
短句来源
     30% for polyvalent pollens.
     夏秋花粉占30%,
短句来源
     The mature pollen is bicellular.
     成熟花粉为二胞型。
短句来源
     in bicellular pollens at the early stage the ribosomes increased in quantity and the mitochondria and plastids differentiated in their structure once again.
     在早期二胞花粉中,核糖体数量增加、线粒体和质体结构再度分化.
短句来源
查询“bicellular pollens”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  bicellular pollens
The movement pathways reflect the organisation of the actin cytoskeleton, elements of which are already focused upon the germination site at the time of dispersal, a disposition only achieved during rehydration and activation in bicellular pollens.
      
The tricellular pollen of wheat germinates rapidly on a receptive stigma without the often protracted activation period characteristic of bicellular pollens.
      


The development of the tapetum in Pinus bungeana may be divided into five stages for the convenience of description.(1) Stage of the microspore mother cells:The organelles of the ta- petal cell,consisting of amyloplasts,Golgi vesicles,lipid bodies,and endoplasmic reticulum are abundant and prominent.(2) Stage of themeiosis h During this period the amount of rough en- doplasmic reticuum (RER),ribosomes,and Golgi vesicles is prominently increasing,in the meanwhile the Golgi vesicles move up and contact with the...

The development of the tapetum in Pinus bungeana may be divided into five stages for the convenience of description.(1) Stage of the microspore mother cells:The organelles of the ta- petal cell,consisting of amyloplasts,Golgi vesicles,lipid bodies,and endoplasmic reticulum are abundant and prominent.(2) Stage of themeiosis h During this period the amount of rough en- doplasmic reticuum (RER),ribosomes,and Golgi vesicles is prominently increasing,in the meanwhile the Golgi vesicles move up and contact with the plasmolemma and then pass over them.On the other hand,the outer tangential wall of the tapetal cell begins to be disintegrated. Then a number of sporopollenin bodies with various shape and size occur outside of the plas- molemma and move gradually into the locule of the microsporangium.In addition,there are a large number of starch grains aggregation in anelectron-dense matrix of the cytoplasm.(3) Stage of the meiosis Ⅱ:The cytoplasm of the tapetal cell has receded,and the plasmolemma has also withdrawn in some degree from tbe callose wall,even forming the embayment-like struc- ture.The pro-Ubisch body can be found in the small embayments,and was usually accompanied with a number of Golgi vesicles.It is interesting to note that the lipid bodies are gradually dec- reasing during meiosis Ⅰ and Ⅱ.On the contrary the pro-Ubisch bodies and sporopollenin bo- dies are continually aggregated outside the plasmolemma.Moreover,the volume of starch grains within the amyloplast also increases.The above fact shows that the synthesis of carbohydrate is still proceeding.At the moment the amount of endoplasmic reticulum and ribosomes has reached the peak.(4) Stage of microspore formation:The cytoplasm of the tapetal cells begins to break down and becomes vacuolated.At this stage,the various organelles are disintegrated to different degrees and the degenerative process of RER and mitochondria is rather slow.(5) Stage of bicellular pollen grain:The cytoplasm of tapetal cell breaks down almost entirely,but the RER and mitochondria can be still recognizable.And there is a prominent,acetolysis-resis- tant peritapetal membrane as well as certain sporopollenin bodies in the outer tangnential wall. During the process of meiosis of microspore mother cell,the function of the tapetal cell in Pinus bungeana may be summarized as follows:(a) The decrease of lipid bodies within cytop- lasm of the tapetal cell is accompanied by the increase of the pro-Ubisch bodies outside the plas- molemma.This phenomenon may be shown that the precursor of pro-Ubisch bodies is close re- lated to the activity of lipid bodies.As has been reported by Carniel (1967),Rowley & Erdtmen (1967) and Echlin & Godwin (t968),the lipid droplets or grey spheroidal bodies are possibly the procursors of the pro-Ubisch bodies.(b) There are a large number of Golgi vesicles in the cytoplasm of tapetal cell at this stage.It may be explained that the precursors of pro-Ubisch bodies or sporopollenin bodies resulted from the activity of lipid bodies subsequently are trans- ferred to outside the plasmolemma via the Golgi vesicles.Perhaps we could consider that these procursors of the osmiophilic materials are carried away in soluble state,then aggregated in the invaginations of the plasmolemma.(c) At the same time,the ribosomal population rises very sharply and the starch accumulation in the amyloplast reaches the peak of their activity.In view of the above situation,the synthesis of the protein and the deposition of carbohydrates are very active.Thus the amount of the pro-Ubisch and sporopollenin bodies are greatly increased during the dyad and tetrad stages in Pinus bungeana.This is the inevitable outcome of the activity of the tapetal cells.

白皮松绒毡层细胞的细胞器是十分丰富的,其中粗糙内质网、核糖体和造粉体在减数分裂过程中达到高峰。小孢子形成时,绒毡层细胞开始解体,内质网和线粒体是最后衰老的细胞器。在单核花粉形成时,处于绒毡层细胞外切向壁上的周绒毡层膜特别明显。但是,孢粉素体却主要分布在内切向壁和径向壁上。有趣的是,绒毡层细胞中的造粉体结构与壁层细胞不同。而且,脂体在二分体阶段基本消失,相反,此刻孢粉素体却在质膜外大量聚集。推测脂体的消长可能与原乌氏体和孢粉素体的形成有关。

The ultrastructure characters of pollen grain in Brassica napus are:1)There are vacuoles in cytoplasm but no starch grain in uniceelluar pollengrain.2)The veget- ative nucleus of bicellular pollen grain is generally spheroidal;while the generative cell is spinde-shaped,with a big nucleus,thin layer of cytoplasmand few cell orgens,no cell wall.3)In three-celled pollen grain the sperm cell is separated from the cytoplasm of vegetative cell by two layers of plasmic membrances.The sperm cell has...

The ultrastructure characters of pollen grain in Brassica napus are:1)There are vacuoles in cytoplasm but no starch grain in uniceelluar pollengrain.2)The veget- ative nucleus of bicellular pollen grain is generally spheroidal;while the generative cell is spinde-shaped,with a big nucleus,thin layer of cytoplasmand few cell orgens,no cell wall.3)In three-celled pollen grain the sperm cell is separated from the cytoplasm of vegetative cell by two layers of plasmic membrances.The sperm cell has no cell wall,but has many ropy sinuous protoplasm evaginations in one terminal of it.

Brassica napus的花粉粒,在不同发育时期超微结构的特征如下:1)单胞花粉粒有一个球形的细胞核和明显的核仁,细胞质内出现液泡,缺少典型的淀粉粒。2)双胞花粉粒的营养核多为球形。生殖细胞纺锤形,无细胞壁,细胞核比例大,细胞质呈薄层,细胞器少。3)三胞花粉粒有一个裂片状的营养核和两个纺锤形的精细胞,精细胞无壁,以两层质膜与营养细胞的细胞质相隔。每个精细胞的一端有多条索状、弯曲的原生质外突。

From ontogeny of the tapetum in Ipomeoa batatas, the ultrastructural feature of tapetal cells are as follows, (l) At stage of the microspore mother cell, besids that the tapetal cytoplasm contains a large number of rough endoplasmic reticula, dictyosomes, ribosomes and mitochondria, the obvious feature is that electron-dense starch grains are accumulated. After meiosis of the microspore mother cells, starch grains resolved. The increase of the amount and volume of the lipid bodies within cytoplasm of the tapetal...

From ontogeny of the tapetum in Ipomeoa batatas, the ultrastructural feature of tapetal cells are as follows, (l) At stage of the microspore mother cell, besids that the tapetal cytoplasm contains a large number of rough endoplasmic reticula, dictyosomes, ribosomes and mitochondria, the obvious feature is that electron-dense starch grains are accumulated. After meiosis of the microspore mother cells, starch grains resolved. The increase of the amount and volume of the lipid bodies within cytoplasm of the tapetal cells is accompanied by decomposition of the starch grains. This shows the formation of the lipid body is close related to the starch grain. (2) At stage of the meiosis: The cytoplasm of the tapetal cells contains a lot of vesicles-like structure formed by endoplasmic reticula and dictyosomes. The amount of the mitochondria increase prominently. Pro-Ubisch and sporopollenin bodies are forming by endoplasmic reticula, while pro-Ubisch body is forming by mitochondria.(3) Stage fcom microspore formation to bicellular pollen grain, besides that pro-Ubisch bodies are countiriucly forming by mitochondria, lipid bodies is decomposed into vesicles or small lipid bodies, then vesicles accumulated osmiophilic materials transform sporopollenin bodies and small lipid bodies accumulated osmiophilic materials transform pro-Ubisch bodies. The rapid increase of sporopollenin, pro-Ubisch bodies is accompanied by the degeneration of lipid bodies. This shows the formatien of sporopollenin pro-Ubisch bodies is close related to the lipid bodies. Expect lipid bodies and mitochondria, the organelles of the tapetal cells decomposed. (4) There is the peritapetal membrane at the inner tangential wall of tapetal cell.

从个体发育看,甘薯绒毡层细胞的结构具有以下主要特点:①小子孢母细胞时期,除细胞具有丰富的内质网、高尔基体、核糖体、线粒体等细胞器外,最明显的特征是细胞质积累大量的电子致密的淀粉粒.到减数分裂后期,淀粉粒全部分解,而脂质体的数量和体积随淀粉粒的分解而增加,这表明脂质体的形成与淀粉粒密切相关.②小孢子母细胞减数分裂时期,绒毡层细胞质中的内质网和高尔基体形成的囊泡状结构增加,线粒体内沉积电子致密物质.在这个时期,内质网和线粒体分别参与孢粉素颗粒和原乌氏体的形成.③小孢子发育至成熟花粉粒时期,除线粒体继续形成原乌氏体外,脂质体首先分解形成与孢粉素颗粒和原乌氏体大小相似的囊泡或小脂质体,然后分别沉积嗜锇物质而形成孢粉素颗粒和原乌氏体.孢粉素颗粒、原乌氏体和乌氏体的数量随脂质体的退化而迅速增加,表明质质体与孢粉素颗粒和原乌氏体的形成密切相关.

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关bicellular pollens的内容
在知识搜索中查有关bicellular pollens的内容
在数字搜索中查有关bicellular pollens的内容
在概念知识元中查有关bicellular pollens的内容
在学术趋势中查有关bicellular pollens的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社