您要查找的是不是：
- nucellar embryony 心层生胚,珠心芽生,珠心胚现象
- 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。
- The nucellar epidermal cell cuts off several layer mucellar parietal cells. 珠心表皮细胞平周分裂产生多层珠心周缘细胞，为厚珠心。
- 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。
- Embryogeny (embryony) 1. The development of an EMBRYO from the moment the ZYGOTE divides. 胚胎发生（胚状体）：1.;是从受精卵分裂开始的胚胎发展过程。
- The nucellar embryo had a suspensor,its development passed through the similiar stages of the zygotic embryo. 珠心胚发育经历与合子胚相同的发育阶段。
- Firstly, several layers of the nucellar cells at the micropylar end elongate longitudinally. 接着,位于珠心组织最上部(珠孔端)的珠心细胞启始死亡;
- Cameron J.W., and R.K. Soost. Nucellar lines of citrus, calif. Agr, 1953, 7(1):8,15,16. 周林杰.;我省研制出廉价的无土栽培基质[J]
- Ultimately, nucellar cells digested away all of their cytoplasm, leaving with cell walls. 出现由膜包围的小体,其中含有细胞质基质和一些细胞器;
- SSR( simple sequence repeat) analyses with13 primers indicated that these tetraploid seedlings were all autotetraploid from the nucellar cells. 采用13对ssr引物分析表明这7株四倍体植株均来自珠心细胞,为同源四倍体。
- A single archesporium differentiates immediately below the nucellar epidermis,it functions directly as 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。
- Among the, five survived seedlings germinating from pale yellow green embryos, four of them are zygotic and the other one is nucellar. 黄绿色胚所萌发之幼苗，其特徵与四季桔相同，为珠心胚；淡黄绿色胚甚少，成活的五株中，四株为有性胚。
- The early stage of pollen chamber development in ovule and the cytological mechanism of nucellar cell death were studied in Ginkgo biloba L. 对银杏(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 main abnormality in the mature embryo sac was single central cell(7.1%) and nucellar cells invaded embryo sac(7.1%). 6. 最显著的异常是珠心组织侵入胚囊及极核的异常（1个极核），比例均为7.;1%25。
- The one megaspore archesporial under the nucellar epidermal cell differentiate directly into megaspore mother cell, the meiosis of megaspore mother cell are nomally. 大孢子孢原细胞在直接发育为大孢子母细胞，大孢子母细胞减数分裂正常，四分体直线型；
- Developing endosperm is of the nucellar type. In late July, mature seeds contain very less endosperm and a big embryo with 2 massive cotyledons,the hypocotyl and the radicle. 胚乳之发育为核型。约在7月下旬，成熟种子只具有非常微量之胚乳，以及两枚子叶、胚轴及胚根。
- Lots of starch grains in nucellar cells and integumentary cells surrounding endosperm haustoria decreased and disappeared with the development of endosperm haustoria. 随着胚乳吸器的发育，吸器附近的珠心细胞和珠被细胞中贮存的大量淀粉粒逐渐减少和消失。
- 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16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。
- High activity of ACPase was observed in the multiple concentric structures in the degenerating cytoplasm, but such structures were not present in the undegenerated nucellar cells. 电镜细胞化学定位也表明退化珠心细胞质中有强烈的酸性磷酸酶活力,它们存在于多层环状的胞质结构中,而远离胚囊的非退化珠心细胞中无上述结构,酸性磷酸酶活性仅出现于液泡中。
- Plasmodesmata in the chalazal end wall as a site for symplastic transportation between nucellar cells and embryo sac only appear in functional megaspore and 1-nucleate embryo sac at early stage. 在功能大孢子及单核胚囊早期是通过合点端的胞间连丝与珠心细胞以共质体形式相通；
