| 词汇 | embryo-sac |
| 释义 | BETA embryo saccollocation in Englishmeanings of embryoand sacThese words are often used together. Click on the links below to explore the meanings. embryo noun[ C ] uk /ˈem.bri.əʊ/ us /ˈem.bri.oʊ/ an animal that is developing either in its mother's womb or in an egg, or a plant that is developing in ... See more at embryo sac noun[ C ] uk /sæk/ us /sæk/ biology specialized a part of a plant or animal that is like a bag and often contains liquid, or a similar artificially ... See more at sac Examples of embryo sacembryo sac This in turn was shown to depend on the growth rates of the embryo and embryosac, both of which differed between genotypes. The capillary often damages the embryosac or more frequently becomes plugged when it is dipped in the agarose and pushed into the cells. Egg cells and non-gametic cells of the embryosac were released from the ovules after dissection with glass microneedles in a 3 cm plastic dish. Egg cells or zygotes isolated from the embryosac were transferred with a microinjector into the trough in the centre of the optical field. The egg cell was then released by pressing the micropylar end of the embryosac. The partial protrusion of the embryosac through the micropyle of ovule facilitated penetration into the embryo sac wall and incision near the egg cell. An egg and two synergids can be observed clearly at anthesis in the partially protruding embryosac. These techniques depend on the surgical removal of the embryo and endosperm and the transport of nutrients into the empty ovule or embryosac. Egg and synergid cells in the embryosac are pear-like. The non-gametic cells of the embryosac, synergids and central cells have also been isolated. Pollen tubes of the same cultivar frequently become blocked between the stigma and embryosac under these conditions. While zygotes could be isolated in a 5% mannitol solution, it was necessary to press the micropylar end to release them when the embryosac was excided by a needle. Eighteen hours after pollination, the fertilized egg cell began to elongate in the embryosac. In angiosperms, the megagametophyte is reduced to only a few nuclei and cells, and is sometimes called the embryosac. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The ovule contains a megagametophyte, also known as an embryosac, that is bipolar in structure and contains 8 cell nuclei. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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