英语释义

1. the central and chief part of a plant ovule that encloses the female gametophyte

片语

nucellar embryos珠心胚

nucellar cells珠心细胞

nucellar embryo[植]

nucellar cell[植]

nucellar cap珠心帽

Nucellar Proembryo珠心原胚

nucellar callus珠心胚的愈伤组织

nucellar projection珠心突起

nucellar line珠心系

英汉例句

• activation of nucellar cells by discharge from the pollen tubes has been claimed.

  认为由花粉管的流出物能使珠心细胞活化。

• degeneration of nucellar cells and integument in early stage;

  珠心珠被细胞提早解体退化；

• programmed cell death of the nucellar cells in ginkgo biloba l.

  银杏珠心组织的细胞程序化死亡。

• a single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.

  孢原细胞处于珠心表皮之下，直接起大孢子母细胞的功能。

• embryo sac lies on the top of nucellar. nucellar tissuesunder ovule form nucellar colum.

  胚囊位于珠心顶部，胚囊下方的珠心组织形成珠心柱。

• the archesporial cell is a cell of 3￣4 layer cells under the nucellar epidermis, the archesporial does not undergo meiosis and becomes the megaspore mother cell.

  孢原细胞为表皮下3～4层细胞处的一个细胞，孢原细胞不经分裂直接发育成大孢子母细胞。

• the early stage of pollen chamber development in ovule and the cytological mechanism of nucellar cell death were studied in ginkgo biloba l.

  胚珠贮粉室的早期发育过程以及珠心细胞死亡的细胞学机制进行了研究。

• the nucellar tissue enclosed by circular embryo develops gradually and accumulates large amounts of starch and develops into perisperm which mainly provides nutrition for seed germinating.

  环形胚包围的珠心组织，逐渐发育并积累大量的淀粉而形成外胚乳，主要用于种子萌发时的养料。

• there are several nucellar cells in micropylar region that develop into embellum.

  珠孔区域有伸长的珠心细胞。

• when the free nuclei of the endosperm were 16 or 32, the nucellar embryo initial (s) originated from the nucellar cells near the micropylar end of the embryo sac.

  当胚乳游离核达到1 6或32个时，最早的珠心胚原始细胞由靠近胚囊珠孔端的珠心细胞分化形成。

• all nucellar cells disappear, when an embryo sac is ripe.

  属薄珠心，胚囊形成时珠心细胞全部消失。

• observation of citrus embryo development showed that in 50 days or so after pollination there was only one zygotic embryo in the embryo sac, and nucellar embryo was not yet invaded.

  通过柑桔胚胎发育观察表明，授粉后50天左右，胚囊内仅有一个合子胚，未见珠心胚侵入胚囊，为单独分离合子胚培养的最好时期。

• the nutrient transported from dorsal vascular bundles first unloaded into apoplast via nucellar projection, then was absorbed by aleurone layer cells;

  由背部维管束运来的养分经珠心突起先卸至质外体，其后再由糊粉层细胞吸收；

• a large amount of starch deposit found in functional megaspore and nucellar cells are presumably as the nutrient source in the developmental process of embryo sac.

  可能有助于营养物质进入胚囊。 4。功能大孢子中贮存丰富的淀粉粒，它和珠心细胞一起是胚囊发育时的营养来源。