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secondary nucleus
相关语句
  次生核
     The process of fusion is similar to the karyogamy, and faster than that. The dispersing of the sperm chromatin in polar nucleus or secondary nucleus takes about 2 hours;
     精核与极核或次生核的融合过程同精核与卵核的融合过程相同,只是精核与极核或次生核融合速度较快。 精核染色质在极核或次生核里分散的时间大约为2h。
短句来源
     9. 16-18 hours after pollination, the sperm nucleus moves to the polar nuclei or the secondary nucleus.
     9.授粉后16~18h精核向极核或次生核移动。
短句来源
     10. 20 hours after pollination, sperm nucleus enters one of the polar nuclei or the secondary nucleus and the triple fusion takes place.
     10.授粉后20h,精核进入1个极核或次生核,二者进行融合。
短句来源
     18 hours after pollination, sperm nucleus adheres to the nuclear membrane of polar nuclei or that of the secondary nucleus;
     授粉后18h,精核附在极核或次生核的核膜上。
短句来源
     Half an hour after the pollination, the pollen could be see germinating on the stigma, 2 hours later,it went into the embryo sac through the micropyle, in 8 to 9 hours started to released something, after 24 hours, the sperm started to enter the secondary nucleus and the egg cell, after 48 hours, the most ovule had finished the double fertilization, the fusion of the nucleolus of the secondary nucleus took place in the 24th hour after pollination.
     授粉后半小时,可以看到花粉在柱头上萌芽,2小时后通过珠孔进入胚囊,8~9小时开始释放物质,24小时后精子开始进入次生核和卵细胞,48小时后大部分胚珠完成双受精过程; 次生核核仁合并、产生于授粉24小时以后。
短句来源
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  “secondary nucleus”译为未确定词的双语例句
     8.The pair polar nuclei lie in chalazal end to egg before fertilization, which fuse into a secondary nucleus or not;
     8.受精前二极核合并成次生核或不合并,位于卵细胞的合点端。
短句来源
     Two sperms fuse with egg cell and secondary nucleus respectively 64 hours after pollination.
     授粉后约64小时两个精子分别与卵和次生核融合。
短句来源
     (2) the late-genesis embryo (26%)which was observed at one or two days after anthesis and formation of free endosperm nuclei. Theendosperm was derived from the polar nucleus or secondary nucleus without fertilization.
     (2)迟发生胚(26%),开花后2~3d,极核分裂形成多个胚乳游离核后,卵细胞启动分裂形成胚。
短句来源
     Solms conforms to the Helobial type,about 19~20 hours after pollination,the other sperm nucleus entered the secondary nucleus,and the free nuclei period began;
     凤眼莲的胚乳发育属沼生目型,授粉后约19~21小时,另一精于与次生核融合形成游离核;
短句来源
     (4) In about 26 hours after pollination, the sperm nucleus of another sperm nestles on the nucleus membranes of the secondary nucleus, and then fuses with it.
     (4)约26h,另一个精子的精核与次生核核膜相贴伏,随后与之融合;
短句来源
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  相似匹配句对
     The secondary nucleus immediately divided after fertilization.
     极核受精前靠近卵器,受精后立即分裂。
短句来源
     On the secondary spectrum
     关于二级光谱问题的探讨
短句来源
     The secondary disaster
     二次灾难
短句来源
     (2) Shen Deficiency is the key and nucleus of secondary osteoporosis to COPD;
     (2 )肾虚是COPD继发骨质疏松的关键与核心 ;
短句来源
     Multi-strange Nucleus
     多奇异性原子核
短句来源
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  secondary nucleus
Endosperm developed from polar nuclei or from the secondary nucleus.
      
This mass colocalized with microtubules radiating from the surface of each secondary nucleus and disappeared when the microtubules were depolymerized by butamifos, which did not affect the configuration of actin filaments.
      
MTs can then be seen radiating from each secondary nucleus that is encountered in the stalk on its migration upwards into the cap rays.
      
This suggests that the cyst organizing secondary nucleus plays an important role in the formation of the cyst lid.
      
Usually the center of the lid forming apparatus lies on the shortest line between the secondary nucleus and the cyst wall.
      
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The present paper deals with experiments on the development of adventive embryos of Hosta caerulea by the application of 0.1% IAA, and 0.01% IAA, and 0.01% 2,4-D to the pistils of emasculated flowers. The results are summarized below. 1. When IAA or 2,4-D was employed to substitute pollination, 80—90% of ovaries remained attached to the plant and continued to grow for a time. All the controls withered and fell off within 3 days. 2. In hormone-treated ovules, the unfertilized egg and secondary nucleus failed...

The present paper deals with experiments on the development of adventive embryos of Hosta caerulea by the application of 0.1% IAA, and 0.01% IAA, and 0.01% 2,4-D to the pistils of emasculated flowers. The results are summarized below. 1. When IAA or 2,4-D was employed to substitute pollination, 80—90% of ovaries remained attached to the plant and continued to grow for a time. All the controls withered and fell off within 3 days. 2. In hormone-treated ovules, the unfertilized egg and secondary nucleus failed to develope, so that there was neither zygote embryo nor endosperm, but the initiating cells of adventive embryos divided to form young adventive embryos. 3. In the hormone-treated ovules, in the early stages, the growth condition and growth rate of adventive embryos were similar to those of pollinated plants. In later stages the former were characterized by the formation of callus-like cell groups and lack of cell differentiation. About 24 days later the ovules showed progressive shrinkage accompanied by a cessation of growth of the adventive embryos. 4. According to the facts observed the conclusion may be drawn that there is no direct relationship between pollination and the origination of adventive embryo, but in further differentiation of the embryo the presence of endosperm or growth-promoting and growth-regulating substances produced by it are necessary.

1.IAA及2-4D可以代替传粉作用可使80—90%紫萼的子房发育。不传粉和不处理子房在三天后全部脱落。 2.在生长激素代替传粉的子房中,合子及次生核不能分裂,因此不能形成合子胚及胚乳,但不定胚原始细胞能进行分裂,形成幼小的不定胚。 3.在生长激素代替传粉的作用下不定胚发育的初期情况和发育速度与正常的相似,但在发育后期,细胞缺少分化,表现为愈伤组织状。24天后,在无胚乳的条件下,停止生长。 4.根据实验结果分析,不定胚的发生与传粉并无直接关系。不定胚进一步分化需要胚乳或它们的活性物质的存在。

This paper deals with early embryogenesis of Actinidia chinensis var.chinensis.1.Ov- ary superior consists of 34—45 carpels.Each carpel contains 11—45 ovules.The ovule is uni-integument and tenuinucellar.The ovule is anatropous.The archesporium is formed by a single cell,and directly develops into megaspore mother cell.Sometimes the archespori- um consists of 2—3 cells,but only one of them develops into megaspore mother cell and the others are degenerated.2.The mature pollen grain is two-celled and the embryo...

This paper deals with early embryogenesis of Actinidia chinensis var.chinensis.1.Ov- ary superior consists of 34—45 carpels.Each carpel contains 11—45 ovules.The ovule is uni-integument and tenuinucellar.The ovule is anatropous.The archesporium is formed by a single cell,and directly develops into megaspore mother cell.Sometimes the archespori- um consists of 2—3 cells,but only one of them develops into megaspore mother cell and the others are degenerated.2.The mature pollen grain is two-celled and the embryo sac belongs to Polygonum type.In most embryo sacs two polar nuclei are fused before fertilization. One of the synergids was destroyed as the pollen tube penetrated into embryo sac,the other one disappeared after fertilization.In most cases the antipodal cells became degenerated in fertilization process,only some remained until the first division of primary endosperm nu- cleus.3.In Beijing area the double fertilization of Actinidia chinensis occurred 30—72 ho- urs after pollination.In the fertilization one sperm fused with egg nucleus and the other sperm fused with the secondary nucleus as usual.The fusion of the secondary nucleus with sperm was in advance of the fusion of the egg nucleus.4.The endosperm is cellular type.

本文报道软毛猕猴桃的早期胚胎发生的研究:——1.子房上位,具34—45个心皮,每心皮含11—45个胚珠。胚珠倒生,单珠被,薄珠心。孢原为1—3个细胞组成,仅有一个转变为大孢子母细胞,其余的退化。2.成熟花粉粒为二细胞型。胚囊蓼型。在大多数胚囊中,两个极核受精前合并为次生核,少数到受精时仍不合并。一个助细胞为花粉管所破坏,另一个在受精期间解体,个别的保持到初生胚乳核分裂时期。3.根据观察,在北京地区,软毛猕猴桃的双受精大多发生在授粉后30—72小时内。受精时,一个精子同卵细胞核融合,另一个同次生核融合,其融合过程较卵核和精子融合结束的早。4.胚乳发育为细胞型。

This work studies the whole process of fertilization in Glycine max.The results are sum- marized as follows:1.The type of ripened pollen grain of soybean was two-cell type.The generative cell was divided mitotically into two spermatids within the pollen tube.2.In the 6th hour after self-pollination,the pollen tube entered into the embryo sac and relea- sed two sperms.Before the fusion of the male and female nuclei,the cytoplasmic sheath of the spermatids falled off.The cytoplasm of the male gamete did not fuse...

This work studies the whole process of fertilization in Glycine max.The results are sum- marized as follows:1.The type of ripened pollen grain of soybean was two-cell type.The generative cell was divided mitotically into two spermatids within the pollen tube.2.In the 6th hour after self-pollination,the pollen tube entered into the embryo sac and relea- sed two sperms.Before the fusion of the male and female nuclei,the cytoplasmic sheath of the spermatids falled off.The cytoplasm of the male gamete did not fuse with that of the egg cell.3.In the 6th hour after self-pollination,one spermatid nucleus come in contact with the egg nucleus and the other with the secondary nucleus,The contact of the sperima- tid nucleus with the egg nucleus was a little earlier than that with the secondary nucleus. 4.The spermatid nucleus entered into the egg nucleus; the chromatic granules of the sper- matid despiralized.After the complete fusion of the spermatid nucleus with the egg nucle- us,the egg nucleus was darkly stained and the chromonemata increased,afterward the male nucleus appeared.5.In the 28th hour after self-pollination,the zygote begun the first mitotic division.It took about 20 hours to fuse the male and female gametes,and to form the zygote untile before first mitotic division.It means that the zygote dormancy stage of soybean was about twenty hours.6.In the 7th hour after self-pollination,the spermatid nucleus fused with the secondary nucleus.The process was similar to that of the spermatid nucleus with the egg nucleus.The chromatic granules gradually despiralized within the se- condary nucleus,and the male nudeoli appeared.The velocity of the fusion of the sperma- tid nucleus with the secondary nucleus was faster than that of the other spermatid nucleus with the egg nucleus 7.In the 10th hour after self-pollination,the secondary nucleus begun the first mitotic division.8.The fertillization of soybean was the premitotic type.

本文观察了受精作用的全过程。自花授粉约6小时后,花粉管进入胚囊,释放精于;8—12小时后,大部分雌雄性核发生融合;约10小时后,胚乳初生核进行第一次有丝分裂;28小时后,合子进行第一次有丝分裂,30—32小时合子分裂的频率最高;雌雄性配子融合形成合子至合子第一次有丝分裂需要20小时左右,即自花授粉9—30小时左右为大豆的合子休眠期。

 
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