珠心

The archesporial cell lies under the nucellus epidermis, which develops into a functional megasporocyte.

孢原细胞位于珠心表皮之下，直接起大孢子母细胞的功能。

Perisperm The nutritive tissue in the seeds of many Caryophyllaceae.It is a diploid tissue derived from the nucellus rather than the embryosac.

外胚乳：存在于多数石竹科植物的种子中的营养组织，二倍性，来源于珠心而不是胚囊。

After zygote dividing,the degeneration of nucellusgains the upper hand,and almost all nucellus cell disappear in 4-5 days after flowingexcept for the most outside nucellus.

合子分裂以后则以退化为主，到开花后4-5天，珠心组织除了表皮细胞外，其他几乎都解体了。

In thistreatment,some embrocyte,which may originate from the nucellus cell,can be foundin few of ovaries in APⅣ.The embryos in most of ovaries in APⅣ and IR36develop normally,but the endosperm,in which many crystal-like substances wereobserved,by spike-spray with 2,4-D 3-hours after pollination.

少数APⅣ子房的"腔"内出现多个"胚状体"，推测可能来自珠心细胞的分裂；在受精后处理的大部分子房胚胎发育正常，但胚乳发育却不正常，胚乳内观察到许多的结晶体。

Utricles convex abaxially, plane or slightly concave adaxially; rostra 1/8-1/5 length of kernel; seed adherent to pericarp; leaves and bracts acute but not acicular at apex.

胞果凸背面，正面的平面或者稍凹；喙1/8-1/5段珠心；种子附着于果皮；叶和苞片锐尖但不是针状的在先端。 16 Corispermum 虫实属

It is thought to regulate the growth and development of the pollen tube.

另外的粉管核会在花粉管穿过珠心时发生分裂。

In conventional sexual hybridization of citrus, nucellar polyembryony, pollen/ovule sterility, genetic heterozygosity, wild sexual incompatibility of most citrus cultivars make it very time-consuming and low efficiency to improve fruit characters.

但是，由于柑橘类植物中存在的珠心胚现象、一些品种中的雌雄性败育、童期过长、远缘有性杂交不亲和等特点使通过传统的有性杂交方式进行品种改良进程缓慢，效率不高。

Four hundred and twenty three ( 262 for HB×T, 49 for S×T, 111for R×T and 1 for B×T) out of 990 individuals exhibiting the trifoliate phenotype oftrifoliate orange were considered to be hybrids by morphology identification and SSRverification; Six hundred and fourteen of 756 plantlets derived from other crosses wereverified to be hybrids by SSR analysis. Of them, 244 for HB×\'Nova\' tangelo, 179 forHB×\'Page\' tangelo, 172 for HB×\'Fairchild\' tangelo, 1 for \'Bendizao\'tangerine×\'Nova\'tangelo, 7 for \'Bendizao\'tangerine×\'Page\' tangelo, 3 for \'Bendizao\'tangerine×\'Murcott\'tangor and 8 for satsuma mandarin×\'Nova\' tangelo.

为区分杂种苗和珠心苗，用形态识别和SSR分析，鉴定了990株枳的杂交后代，得到了423株三叶杂种(HB柚×枳262株，温州蜜柑×枳49株，红橘×枳111株，华农本地早橘×枳1株)；SSR分析鉴定了其它杂交后代的756个单株，结果共获得了614株杂种，其中HB柚×诺瓦244株，HB柚×佩奇179株，HB柚×费尔切尔德172株，华农本地早橘×诺瓦1株，华农本地早橘×佩奇7株，华农本地早橘×默科特3株，温州蜜柑×诺瓦8株。

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。

A development-course observation of the morphological changes in the nucellar cells undergoing PCD to form pollen chamber was performed.

在珠心细胞发生PCD的过程中，其形态变化显著，有序地降解细胞组分，其间液泡起着关键作用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。