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半倒生的
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     Semi-Markov Brownian Motion
     Markov布朗运动
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     Half Homomorphism of Modules
     模的同态
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     The results showed that ovule surface might bedivded into the chalazal zone,crest zone,middle zone and the micropylezone.
     结果表明,倒生的棉花胚珠可以分为合点区、株柄顶区、腰区和珠孔区。
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In 1989一1991,the material of Prunus mume(Xiyeqing cv. ) for the embryological study was collected in Nanjing area. The peak of the differentiation period of carpellary primodium was on the first decade of Oct.During the last decade of Dec.,the ovules primodia formed,In the fol-lowing year,starting from the last decade of Feb.to the early March, the embryo sac drifted to-wards maturation. The development of embryo sac conforms to Polygonum type. Two semianatropous ovules were contained in the ovary,but usually...

In 1989一1991,the material of Prunus mume(Xiyeqing cv. ) for the embryological study was collected in Nanjing area. The peak of the differentiation period of carpellary primodium was on the first decade of Oct.During the last decade of Dec.,the ovules primodia formed,In the fol-lowing year,starting from the last decade of Feb.to the early March, the embryo sac drifted to-wards maturation. The development of embryo sac conforms to Polygonum type. Two semianatropous ovules were contained in the ovary,but usually only one could develop into a seed.The ovule is crassinucellar with nucellar cap,and an obturator arises near its micropyle.Af-ter 2一3 days of pollination,pollen tubes passed through transmitting tissue and entered into the ovary. About 5 days after pollination, most of the embryo sacs were already double fertilized,the free nuclei of endosperm appeared 8 days after pollination,and the proembryo differentiation init-iated about thirteen after pollination. The process of embryo development belongs to Asterad type. In the present paper,the origin and fuction ofthe nucellar cap and obturator,the time of fer-tilization and the abnotmal phenomena of the pistil development, fertilization in Prunus,mume and its relation to the early fall of flowers and fruits are discussed.

以梅细叶青品种为试验材料。在南京地区,雌蕊心皮原基分化高峰期在10月上旬。12月下旬,形成胚珠原基。次年2月下旬至3月初,胚囊分化渐趋势成熟。寥型胚囊。子房内着生2个半倒生胚珠,通常仅1个发育为种子。胚珠具厚珠心,形成珠孔塞和珠心冠。3月上旬开花,传粉后2-3天,花粉管经引导组织进入子房,5天左右,多数胚囊中已完成双受精,8天,胚乳游离核开始出现,13天左右的材料,原胚开始形成。胚胎发育属紫荒型。本文讨论了珠心冠、珠孔塞的起源和功能,受精的时间,雌蕊发育和受精过程异常与花、果脱落的关系。

There are two hemianatropous ovules in the ovary of Mei tree. At anthesis, the embryo sac may be found in the stages ranging from four nuclei to eight nuclei. The endocarp comprises three distinct tissue areas, the inner area consisting of 4~6 layers with tangentially elongated cells. About 40~45 days after flowering, lignification of the endocarp begins.The exocarp is a composite structure,composed of epidermal cells,stomatal apparatus, hairs and several hypodermal layers. The mesocarp is largely of parenchymatous...

There are two hemianatropous ovules in the ovary of Mei tree. At anthesis, the embryo sac may be found in the stages ranging from four nuclei to eight nuclei. The endocarp comprises three distinct tissue areas, the inner area consisting of 4~6 layers with tangentially elongated cells. About 40~45 days after flowering, lignification of the endocarp begins.The exocarp is a composite structure,composed of epidermal cells,stomatal apparatus, hairs and several hypodermal layers. The mesocarp is largely of parenchymatous tissue,close to the endocarp, there are several layers of cells of the mesocarp radially elongated. About 35~40 days after flowering, the maximum size of the integument is reached, in which tissue contains a lot of starch granules. Although the division of the primary endosperm nucleus usually precedes that of the zygote,the endosperm cells do not formed until the proembryo develops into the globoid embryo properly. Then,the endosperm is digested and absorbed by the rapidly developing embryo.In the present paper,discussions were also made on the questions such as the type of the ovule, the formation of the endosperm,the relation of the developing speed of fruits to the embryogensis ot P. mume and so on.

该文对梅果实发育过程进行了较系统研究.梅子房内着生二个半倒生胚珠,开花时,胚囊处于4至8核阶段.内果皮分三个层次,最内层的4~6层细胞明显纵向加长,它的硬化大约从花后40~45d开始.外果皮是一种复合结构,由表皮毛、表皮细胞、气孔器和数层下皮组织细胞组成.中果皮主要是薄壁细胞,靠近内果皮的数层中果皮细胞径向显著加长.大约在开花后35~40d,珠被体积达最大,细胞内含大量淀粉.初生胚乳核分裂比合子早,但一直到原胚发育成球形胚时,胚乳游离核才转变为胚乳细胞.以后,胚乳细胞又被迅速发育的胚所吸收和利用.该文对胚珠类型、珠孔塞起源、胚乳吸器及果实发育速度与胚胎发育的关系进行了讨论

 
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