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
   pollens 在 生物学 分类中 的翻译结果: 查询用时:0.012秒
图标索引 在分类学科中查询
所有学科
生物学
农作物
园艺
蚕蜂与野生动物保护
中药学
林业
更多类别查询

图标索引 历史查询
 

pollens
相关语句
  花粉
    Effect of the Anther Wall Tissue on the Dedifferentiation of the Pollens
    药壁对花粉去分化的影响
短句来源
    An Investigation on pollens in the Air over Huhehaot City
    呼和浩特市空气中的花粉初探
短句来源
    MORPHOLOGICAL STUDY OF LEAVES AND POLLENS ON MEDICINAL SPECIES OF GENUS ARALIA IN CHINA
    中国楤木属药用植物花粉和叶片的形态学研究
短句来源
    STUDY ON MORPHOLOGY OF 10 SPECIES HONEY SOURCE POLLENS FROM MONGOLIAN PLATEAU
    蒙古高原10种蜜源植物花粉形态描述
短句来源
    Possibility of Target Gene Introgression from Transgenic Wheat into Non-transgenic Plants Through Pollens
    转基因小麦目标基因通过花粉漂流的可能性研究
短句来源
更多       
  “pollens”译为未确定词的双语例句
    Analysis and Evaluation of Main Nutrients from Bee Pollens of Caria papaya and Canarium album
    番木瓜、橄榄蜂花粉营养成分的分析与评价
短句来源
    A Study on the Representation of Common Pollens in Soils on the Northern Slope of Shennongjia Mountains
    神农架北坡表土常见花粉的R值研究
短句来源
    The pollens of type one and two were bigger than others and the length of P and E was 41.3-45.7 um and 25.3-29.5 Mm.
    其它类型的大,极轴长和赤道轴长分别为41.3一45.7林m和25.3一”.
短句来源
    This paper deals with the sterile effect of the chemosterilant Thiotepa on the mosquito Culex pipiens pollens Coq.
    本文报道了昆虫化学不育剂噻派(Thiotepa)对淡色库蚊(Culex pipiens pallens Coq.)
短句来源
    The developmental stage of the pollens in the anther for inoculation was at the middleanaphase period. The calli were induced on the N_6 medium,supplemented with kinetin(2mg/l),2,4-D (0.5mg/l),L-glutamine(800mg/l)and serine(100mg/l).
    诱导愈伤组织用 N_6基本培养基附加激动素(KT)2.0mg/l,2,4-D 0.5mg/l,谷氨酰胺800mg/l,丝氨酸100mg/l。
短句来源
更多       
查询“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。
  pollens
Golgi 58K-like protein in pollens and pollen tubes ofLilium davidii
      
Anthers were removed from the irradiated florets on the same day and the florets were pollinated with normal fresh pollens of T.
      
However, the pollens of 5 species were investigated under TEM (transmission electron microscopy).
      
The HPLC analysis of the buds, pollens and petals of two species ofAesculus is reported.
      
Pollens from trees of the Fagales, Oleaceae, and Cupressaceae belong to the most potent and frequent allergen sources.
      
更多          


The F_1 hybrid plant between Oryza sativa L.and Pennisetum sp.was obtained by Teng Yen Tang in 1958.In many morphological characters the hybrid appears to be superior to the parental plants,such as the culms are taller,the leaves are comparatively longer and broader,and the spikes are apparently much larger.However,the form of the spikes of the hybrid plant is spreading type which resembles that of the mother plant. In general,the hybrid plant bears a close resemblance to the female parent,though its spikelets...

The F_1 hybrid plant between Oryza sativa L.and Pennisetum sp.was obtained by Teng Yen Tang in 1958.In many morphological characters the hybrid appears to be superior to the parental plants,such as the culms are taller,the leaves are comparatively longer and broader,and the spikes are apparently much larger.However,the form of the spikes of the hybrid plant is spreading type which resembles that of the mother plant. In general,the hybrid plant bears a close resemblance to the female parent,though its spikelets produce conspicuous long awns which must be inherited from the pollen plant. The F_1 hybrid is almost completely sterile,for it only occasionally produces one or two grains in open condition.Owing to the high regenerating feature,the hybrid plant has been successfully cultivated by vegetative propagation. In a majority of cases,megaspores have been observed to degenerate in rather early stages.More than half of the ovaries examined thus lack embryo-sac formation,they seem to grow parthenocarpically to some extent before degeneration sets in.Embryo- sacs have also been observed to degenerate sooner or later after their formation.In a well formed embryo-sac,when it does occur,the normal three successive mitoses of the nucleus of the embryo-sac mother cell do not occur regularly,and the matured embryo- sac which results,lacks some of its apparatuses.In some cases,the apparatuses differen- tiate in abnormal way.The number of the polar nuclei may be more than two,that of the antipodals is,sometimes,less than three,and the egg apparatus may be composed of four cells instead of three.It is apparently that the apparatuses of the embryo-sac produced in such abnormal manner are functionless.In other cases,the sac loculus of an enlarged ovary has been found to contain nothing but liquid.Only in very rare cases,the for- mation of the embryo-sac and the differentiation of the apparatuses have been carried through in the proper manner. The chromosome number of Oryza sativa L.is n=12 and that of Pennisetum sp. is n=9.Both the somatic and the gametic chromosome numbers of the F_1 hybrid are variable and they generally do not correspond to the sum of the reduced chromosome numbers of the parents,unlike what they usually do in the intergeneric hybrids raised from other cereals as reported by many investigators.In meiosis of the hybrid,the chromosome behavior is very irregular,different numbers of uivilents and bivalents have been counted in different pollen mother cells,and one or two trivalents may also be pre- sent in some of the pollen mother cells.The trivalents are often V-shaped,but some- times they are chain-shaped.A number of lagging chromosomes have been met with at metaphases and anaphases of both first and second meiotic divisions.During the forma- tion of the restitution nuclei the laggards are often excluded,but they do not form micronuclei.In both heterotypic and homotypic meiotic divisions the spindle formation is regular.There is no unequal division of the pollen mother cell.Multipolar spindle and multispindle are not present,and finally normal tetrads result.However,the tetrads do not develop further and most of them soon degenerate.There is only a small number of floulets in the anthers of which a few fertile pollens have been observed.It is evident that all the irregularities occurred in the course of embryo-sac formation and differentia- tion together with the breakdown of the meiotic cycle in the pollen mother cells are the causes of the sterility of the F_1 hybrid plant.

1.本工作对于邓炎棠所获得的水稻北陆12-狼尾草杂种 F_1不孕植株进行了细胞学观察,附带对于胚囊的形成及雌配子体的分化作了简单的描述。2.在孕穗期固定的材料中观察到多数大孢子在形成过程中即退化而不能发育成胚囊。一些已形成的胚囊中没有细胞而也呈退化现象。雌配子体大多数不能正常分化为卵器、极核与反足细胞,或能分化而细胞的数目不正常,有时卵器中助细胞与卵细胞不能区分。在有一些情况下子房膨大而胚囊中充满了液体。仅在少数情况下观察到雌配子体的正常发育。3.母本水稻的染色体为 n=12,父本狼尾草的染色体为 n=9,而杂种 F_1的体细胞染色体变化在12—42之间,而在花粉母细胞中的染色体则变化在12—20之间,但也有多至30余者。4.在减数分裂中期Ⅰ及Ⅱ和后期Ⅰ及Ⅱ都经常看到有大量落后的染色体。在后期Ⅰ及Ⅱ偶然也遇到染色体桥。在末期Ⅰ及Ⅱ或甚至在形成四分孢子时仍经常观察到遗留在核外的染色体。但并不形成小核。5.在减数分裂的两次分裂中纺锺体的形成都是正常的,没有发现细胞的不等分裂,多极纺锺体或多纺锺体等现象。四分体的形成同样也是正常的,没有发现二分体或五分体等的形成。但是,小孢子形成后,其核大多数不能分裂,因而产生了败...

1.本工作对于邓炎棠所获得的水稻北陆12-狼尾草杂种 F_1不孕植株进行了细胞学观察,附带对于胚囊的形成及雌配子体的分化作了简单的描述。2.在孕穗期固定的材料中观察到多数大孢子在形成过程中即退化而不能发育成胚囊。一些已形成的胚囊中没有细胞而也呈退化现象。雌配子体大多数不能正常分化为卵器、极核与反足细胞,或能分化而细胞的数目不正常,有时卵器中助细胞与卵细胞不能区分。在有一些情况下子房膨大而胚囊中充满了液体。仅在少数情况下观察到雌配子体的正常发育。3.母本水稻的染色体为 n=12,父本狼尾草的染色体为 n=9,而杂种 F_1的体细胞染色体变化在12—42之间,而在花粉母细胞中的染色体则变化在12—20之间,但也有多至30余者。4.在减数分裂中期Ⅰ及Ⅱ和后期Ⅰ及Ⅱ都经常看到有大量落后的染色体。在后期Ⅰ及Ⅱ偶然也遇到染色体桥。在末期Ⅰ及Ⅱ或甚至在形成四分孢子时仍经常观察到遗留在核外的染色体。但并不形成小核。5.在减数分裂的两次分裂中纺锺体的形成都是正常的,没有发现细胞的不等分裂,多极纺锺体或多纺锺体等现象。四分体的形成同样也是正常的,没有发现二分体或五分体等的形成。但是,小孢子形成后,其核大多数不能分裂,因而产生了败育的花粉粒。仅在极少数花的花药中见到正常的花粉粒。6.正常发育的雌雄配子非常少,因而导致了杂种 F_1植株的高度不孕性。

Two auto-allohexaploids with the respective constitution of aacccc and aaaacc were obtained following colchicine treatment with two F_1 triploid hybrids, which had been produced by crossing Brassica napus (aacc, 2n=38) with its two primary species, B. oleracea (cc, 2n=18) and B. chinensi8 (aa, 2n=20) respectively.Morphologically, the two hexaploids are characterized by the general gigantic appearance, diagnostic of the enhancing growth in horizontal direction of such organs as leaves, stems, various components...

Two auto-allohexaploids with the respective constitution of aacccc and aaaacc were obtained following colchicine treatment with two F_1 triploid hybrids, which had been produced by crossing Brassica napus (aacc, 2n=38) with its two primary species, B. oleracea (cc, 2n=18) and B. chinensi8 (aa, 2n=20) respectively.Morphologically, the two hexaploids are characterized by the general gigantic appearance, diagnostic of the enhancing growth in horizontal direction of such organs as leaves, stems, various components of flowers, fruits, et al. This is the feature also unique in autotetraploids. The somatic chromosome numbers of the two hexaploids as identified in the mitosis of root tip cells were found to be 56 and 58 respectively, which are just the doubling of the chromosome numbers of the respective triploids, 28 and 29.During the meiosis of pollen mother cells, both hexaploids form distinctly fewer univalents as compared with the triploids, but showed more trivalents and quadravalents instead.Fertilit s found apparently recovered in the two hexaploids, but it was by no means complete, obviously due to the autotetraploidy of one basic set of chromosomes.Tests on the compatibility of crosses were made between the hexaploids and triploids with three parental species, B. napus, B. oleracea and B. chinensis, and the results showed that the compatibility with any of the three species is much lower in the hexaploids as compared to the triploids. This suggests a more complete sexual isolation being established between the synthesised hexaploids and the parental species.

通过将欧洲油菜(B. napus, aacc)的二个品种分别与其二个基本种甘蓝(B. oleracea, cc)和白菜(B. chinensis, aa)进行杂交所产生的两种三倍体杂种acc和aac,经秋水仙素处理后,获得了两种同源异源六倍体aacccc和aaaacc.它们和同源四倍体一样,具有横向发育的巨大特性.它们的染色体数目,一般正好是两种三倍体数目28和29的加倍而为56和58.它们在减数分裂时的单价体数目比三倍体显著地减少了,但另外却有少量三价体和四价体出现.它们的可育性比三倍体显著地恢复了,但由于其中有同源四倍性部分的存在,因而并不能完全恢复;如再通过一定的选育,或者可有一定的利用希望.它们和欧洲油菜、甘蓝及白菜三种亲本类型之间的可杂交性比三倍体显著地降低了,表示其间的生殖隔离程度似乎是加强了.

The development of haploid plants has been successfully induced from wheat (Triticum vulgare)pollens by means of the anther cultured in vitro.On the MS medium supplemented with 2-20mg/l 2,4-D and various organic addenda,out of 21094 inoculated anthers taken for culture from 27 hybrids or varieties,103 produced calli.All the calli developed from dehisced anther sacs.Microscopical examinations indicated that these calli were formed by repeated divisions of the pollen grains.5 days after,the pollen...

The development of haploid plants has been successfully induced from wheat (Triticum vulgare)pollens by means of the anther cultured in vitro.On the MS medium supplemented with 2-20mg/l 2,4-D and various organic addenda,out of 21094 inoculated anthers taken for culture from 27 hybrids or varieties,103 produced calli.All the calli developed from dehisced anther sacs.Microscopical examinations indicated that these calli were formed by repeated divisions of the pollen grains.5 days after,the pollen calli were transferred into the medium containing either 0.2-2mg/l NAA and 0.2-2mg/l kinetin or 0.5mg/l IAA and 15% cocoanut milk,differentiation of shoots began to occur.It was also found that if the anthers were inoculated on the MS medium containing either 20% cocoanut milk or 2mg/l IAA and 2mg/l kinetin,shoots would develop directly from the anther sacs.The chromosome counts in root tips of 6 plantlets examined gave the number 21,confir- ming that they are haploids.The haploid plants produced spikes but did not set seeds.

采用离体培养小麦(Triticum vulgare)花药的方法成功地诱导小麦花粉形成了单倍体植株。在附加2—20毫克/升的2,4-D 和各种有机附加物的 MS 培养基上,属于27个杂种或品种的21094个花药中有103个花药产生了愈伤组织,这些愈伤组织均着生在裂开的药室内,显微观察证明它们是由花粉经过多次细胞分裂形成的。花粉愈伤组织转移到含有0.2—2毫克/升的萘乙酸和0.2—2毫克/升的激动素或含有0.5毫克/升的吲(口朶)乙酸和15%椰乳的 MS培养基上培养5天以后,即陆续分化出幼苗。此外还发现接种在含有20%椰乳或吲(口朶)乙酸及激动素各2毫克/升的 MS 培养基上的花药直接从药室内产生出幼苗。已检查的6株幼苗的根尖细胞的染色体数均为21,表明它们是单倍体。单倍体植株能够抽穗而不结实。

 
<< 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pollens的内容
在知识搜索中查有关pollens的内容
在数字搜索中查有关pollens的内容
在概念知识元中查有关pollens的内容
在学术趋势中查有关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