珠心

自观察到幼胚后的第5d起，每隔5天取种子制作石蜡切片，镜检珠心胚何时开始入侵胚囊。

Since the 5th day after observing embryo , seed production paraffin section is taken every 5 days , observes the nucellus embryos when to embryo sac .

珠心细胞中只见到可溶性多糖。

Soluble polysaccharides was observed in the nucellus cells .

花椒珠心胚的超微结构及珠心细胞ATP酶的细胞化学定位

Ultrastructure of nucellar embryo and cytochemical localization of ATPase activity in nucellar cell of Xanthoxylum bungeanum

M99上的外植体，胚珠内尤其是珠心组织中DNA、RNA含量增加，薄壁细胞内DNA含量逐渐减少；

In explants of M99 , DNA and RNA content increased in ovules , especially in nucellus .

对获得的7株四倍体植株进行SSR分析，表明这7株四倍体均来自珠心细胞，为体细胞自然加倍得到的同源四倍体。

SSR ( simple sequence repeat ) analyses indicated that the 7 tetraploid seedlings were autotetraploid from nucellar cells .

验证了珠心胚由L2层细胞发育而来。

And it is concluded that the nucellar embryo in citrus is derived from the cell in L2 layer .

APⅣ珠心组织出现低频率异常生长的现象，但未观察到在自然条件下由珠心细胞发育形成的不定胚。

A low frequency of abnormal nucellar growth was observed in AP ⅳ, but no embryo developed from nucellus cell was found under natural condition .

小草蔻（AlpiniahenryiK.Schum）胚珠倒生，厚珠心，双珠被。

The ovules of Alpinia henryi K. Schum are anatropous , crassinucellate and bitegmic .

授粉后1h花粉管经珠孔及珠心表皮细胞间隙进入1个助细胞，并释放精子。

One hour after pollination , pollen tube goes through the intercellular space of nucellar epidermis and enters one of the synergids , releases two sperms .

原生质体融合技术能有效克服柑橘有性杂交不亲和、雌和／或雄性败育以及珠心胚干扰等问题，实现核DNA和胞质DNA重组，为柑橘遗传改良提供了一条新的途径。

Somatic hybridization via protoplast fusion is a new alternative for circumventing some reproductive barriers in citrus traditional breeding , such as sexual incompatibility , female and / or male sterility and polyembryony , and it can also realize novel combinations of nuclear and / or cytoplasmic genomes .

平邑甜茶的无性胚囊原始细胞始于盛花期前后靠近合点端的珠心细胞，并很快发育为单核无性胚囊，盛花后5～7d的坐果初期形成无性的八核胚囊。

The aposporous initials , the nucellar cells in the chalazal end , developed during full blooming stage . Then it grew rapidly to unreduced embryo sac and formed 8-nuclei aposporous embryo sac , which happened 5 to 7 days after full bloom .

珠心胚原始细胞发生频率为27%。

The frequency of initial ( s ) origination was27 % .

电镜和光镜观察表明，适应型珠心愈伤组织由胚性细胞和非胚性细胞组成。

The habituated nucellar calli consisted of embryogenic and non-embryogenic cells .

其不定胚起源于胚珠内的珠心细胞。

Their origins were assured to be from nucellar cells in ovule .

3种柑橘亚科植物的珠心组织培养

In vitro culture of nucelli in 3 species of citrus subfamily plants

结果表明，3株实生苗均为珠心苗。

It is deduced that the3 seedlings are from nucellars .

属薄珠心，胚囊形成时珠心细胞全部消失。

All nucellar cells disappear , when an embryo sac is ripe .

起源于珠心的体细胞无孢子生殖胚囊的发育属于山柳菊型。

The development of embryo sac of apospory is of Hieracium type .

水稻珠心细胞的超微结构及酸性磷酸酶活性的动态变化

Dynamic Changes of the Ultrastructure and Acid Phosphatase Activity in Rice Nucellar Cells

珠心细胞的细胞核以两种方式衰退。

Two patterns of unclear degeneration was found in the degenerated nucellar cells .

第三道碾皮主要碾除了麦粒的种皮及部分珠心层。

The third pass debranned the episperm and a part of nucellar layer .

雌性孢原为珠心亚表皮下多细胞。

The female archesporium differentiates from many cells under the subhypodermis of nucellus .

胚珠直生，厚珠心，珠心被内、外珠被以及盖被等三层被膜所包围。

The ovule is orthotropous and crassinucellate , nucellus is surrounded by three envelopes .

珠心表皮下的雌性孢原直接发育为大孢子母细胞。

The archesporial cell below nucellus epiderm functions directly as the megaspore mother cell .

单多胚水稻珠心组织消长变化的比较研究

Comparative Studies on the Behavior of Growing of Nucellus between Monoembryonic and Polyembryonic Rice

哈姆林甜橙幼胚组培珠心植珠的高接观察

Observation on Top Grafting of Tissue Culture Plants from Young Embryos of Hamlin Orange

认为由花粉管的流出物能使珠心细胞活化。

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

水稻胚乳发育中珠心凋亡与胚乳细胞构建的研究

Studies on Nucella PCD and Endosperm Cells Construction during the Development of Endosperm of Rice

某些植物的珠被和珠心细胞形成完全正常的胚。

The cells of the integument and nucellus of some plants form perfectly normal embryos .

在衰退中期的珠心细胞中，Ca2+主要分布在核膜、液泡膜及质膜上；

But calcium was only observed on the vacuolar membrane in the extremely degenerated nucellar cells .