孢子母细胞

Archesporium The single cell or group of plant cells in the sporophyte from which spore mother cells may eventually develop in a sporangium.

archesporium 孢原细胞：植物孢子体中的单个细胞或单组细胞。在那里孢子母细胞最终发育为孢子囊。

Subsequently, the tapetum cell began to disorganize, and it kept the strongest Ca^2＋ fluorescence intensity from microspore to pollen maturity until the tapetum was disappeared completely.

在花药壁组织内Ca^2＋分布也呈现规律性的变化：造孢组织时期，花药壁组织Ca^2＋荧光强度在不同壁层组织中分布均匀；小孢子母细胞时期，药壁中层细胞Ca^2＋荧光最强，绒毡层细胞次之；单核小孢子时期，绒毡层细胞呈解体状态，Ca^2＋荧光最强，并保持到二核花粉时期直至绒毡层完全消失，但此时花药纤维层发育形成，表现出较强的Ca^2＋荧光。

Female gametogenesis in higher plants undergoes various developmental changes, including the de novo formation of germline cells, the differentiation of the megaspore mother cell, meiosis, megaspore selection, and the development of the embryosac.

高等植物雌配子体的形成涉及孢原细胞和大孢子母细胞的确立与分化、大孢子发生、功能大孢子以及胚囊的形成和发育等多种复杂调控过程。随着当代生物技术及功能基因组学的发展，近年对雌配子体发育的研究已从细胞学描述逐渐过渡到对基因和发育调控分子机理的探索。

Results indicated : The meiosis stages of megaspore of white poplars are different, while there was a association between MMCs and PMCs meiosis in the same hybrid.

研究表明，不同白杨的大孢子母细胞减数分裂进程存在差异性，而同一树种的大、小孢子母细胞减数分裂进程存在时序性相关。

Ovule development began in August, and rectangle megasporocyte began to occur in December, and linear tetrads of megaspores were formed in meiosis. In most occasions, only the chalazal megaspore was functional.

云南红豆杉胚珠从8月开始发生，大孢子母细胞12月开始发生，呈方形，减数分裂后形成4个"一"字形大孢子，在大多数情况下，只有靠合点端的大孢子发育为功能大孢子。

In the functional cell such as archesporial cell,megasporocyte,dyad,tetrad and youngmegaspore,among which the three cells close to micropyle end do not degeneratewholly,no clear starch grains were observed as well as in the embryo sacs from singlenucleate embryo sac to 8-nucleate one just forming.

淀粉粒变化有规律性，在孢原细胞、大孢子母细胞、二分体、四分体和早期的大孢子（即四分体中近珠孔端的3个细胞未完全退化）等功能性细胞中未观察到明显的淀粉粒。

CaM mRNA was substantially expressed in thetapetum, stigma, pollen tube track, degenerated synergid and transfusion parenchymacells. Lesser but yet significant amounts of CaM mRNA were also localized in themicrospore mother cells, microspores, pollen, antipodal cells, egg cell and central cell.

钙调素mRNA在绒毡层、柱头、花粉管生长途径、退化助细胞以及维管薄壁细胞中大量表达，也可在小孢子母细胞、小孢子、花粉、反足细胞、卵细胞以及中央细胞中检测到。

Ovule development began in August, and rectangle megasporocyte began to occur in December, and linear tetrads of megaspores were formed in meiosis. In most occasions, only the chalazal megaspore was functional.

云南红豆杉胚珠从8月开始发生，大孢子母细胞12月开始发生，呈方形，减数分裂后形成4个&一&字形大孢子，在大多数情况下，只有靠合点端的大孢子发育为功能大孢子。

The first split of microspore mother cell is observed after one week after beginning of temperature arised under high temperature but the split of secondary sporogenous cell doesn't be found. The split of secondary sporogenous cell is still found after one week but the first split of microspore mother cell is observed after 12d under low temperature. Formating speed of male gametophyte is affected by temperature.

在高温条件下，开始加温1周后即看到小孢子母细胞进行第一次分裂，未观察到次生造孢细胞的分裂；在低温条件下，1周后仍能看到次生造孢细胞的分裂，12d后才看到小孢子母细胞进行第一次分裂。

Megaspore mother cells undergo meiosis, which results in the formation of 4 megaspores in a row. The chalazal-most cell develops into an 8-nuclei embryo sac after 3 rounds of mitosis. A mature embryo sac is produced after cellularization and nuclear migration.

结果表明：1大孢子母细胞经过减数分裂形成直线排列的4个大孢子，其中珠孔端的3个大孢子退化，合点端的大孢子进行3次有丝分裂，形成八核胚囊， 8个核迅速细胞化，最终发育为成熟胚囊。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。