减数分裂

The protein OsSPO11-1 coded with rice reductional division gene OsSPO11-1 is the protein having SEQ ID No.2 amino-acid residue of the sequence table, or, it is the protein derived from SEQ ID No.2 in which protein, SEQ ID No.2 amino acid residue sequence being proceeding substitution, deletion or addition with one or more amino acid residue, but having the same activity of SEQ ID No.2 amino acid residue sequence.

水稻减数分裂基因OsSPO11-1编码蛋白OsSPO11-1，是具有序列表中SEQ ID №：2氨基酸残基序列的蛋白质，或者是将SEQ ID №：2的氨基酸残基序列经过一个或几个氨基酸残基的取代、缺失或添加且具有与SEQ ID №：2的氨基酸残基序列相同活性的由SEQ ID №：2衍生的蛋白质。

These abnormal changes mainly occurred at two stages:(1) at meiotic prophase, almost half of Peiai 64S microsporocytes exhibited aberration, with sparse free ribosomes, underdeveloped mitochondria and many swollen endoplasmic reticula.

这些变化主要发生在两个阶段：（1）减数分裂前期，约半数的小孢子母细胞的胞质出现异常，游离核糖体稀少，并具有不发育线粒体和大量泡状内质网。

In the anthers of China CMS lines,there is normaldifferentiation of anther walls,male sterility is characterizedby the abortion of sporogenous cells and microsporemother cells.

我国棉花细胞质雄性不育的败育时期主要集中在造孢细胞增殖时期和花粉母细胞减数分裂时期。

Perenial flowering planrs of Strelitzia reginae are used as material. The First meiosis young flowers are induced with different concentration colchicines (0.05%, 0.10%, 0.20%).

以多年生开花鹤望兰植株为试验材料，采用不同浓度秋水仙素(0.05%， 0.10%， 0.20%)对鹤望兰处于减数分裂Ⅰ期的幼小花蕾进行诱导。

But, there was no Ca(superscript 2+) precipitate in tapetal cells of Zhenshan 97B at the pollen mother cell stage and the meiosis stage and the Ca(superscript 2+) precipitates in tapetal cells mainly deposited in the disaggregated cytoplasm.

而保持系绒毡层细胞遮花粉母细胞时期和减数分裂时期细胞内没有Ca(上标 2+)沉淀；单核花粉时期绒毡层细胞内的Ca(上标 2+)沉淀主要分布在解体的细胞质内。

The results showed that PCD was initiated in the tapetal, chalice, and connective cells during tetrad stage after mitosis of the anther tissue cells; however, anther vascular tissues underwent PCD during microspore mother cell stage.

结果表明绒毡层、环形细胞、药隔组织细胞在减数分裂后四分体时期开始出现PCD，而花药维管束细胞从小孢子母细胞时期就开始出现PCD。

The result is consistent with previous studies. Whereas, tapetal cells of sterile anthers were disintegrated since tetrad cells were disjoined, indicating that disintegration of tapetal cells is earlier occurred in sterile anther than that in fertile anther. DNA ladder revealed that the cleavage of nuclear DNA into oligonucleosome-sized fragments to

结果表明，在花粉母细胞减数分裂后的四分体解离时期，不育花药的绒粘层细胞较可育花药提前开始裂解；在不育系S-Mo17rf3rf3花药和花粉S-(rf3)中均明显出现PCD过程的DNA片段化以及线粒体细胞色素C外渗的现象，证明了玉米CMS-S的花粉败育与花药绒粘层细胞的提前凋亡和小孢子细胞的细胞程序性死亡有关。

The cytoplasm of the tapetum cells of Zhenshan 97A deposited a few Ca(superscript 2+) precipitates at the pollen mother cell stage. At the meiosis stage, there were many large Ca(superscript 2+) precipitates at the inner longitudinal cell wall; there were a layer Ca(superscript 2+) precipitates around the tapetal cells.

珍汕97A绒毡层细胞从花粉母细胞时期开始，细胞质内有少量颗粒状的Ca(上标 2+)沉淀；减数分裂时期，绒毡层细胞的内切向壁表面有大量大颗粒的Ca(上标 2+)沉淀；单核花粉时期绒毡层细胞周围集聚一层Ca(上标 2+)沉淀。

No tapetal cells were formed or tapetam collapsed at very early stage in some anther chamber during the microsporogenesis; Pollen mother cells in another chamber were not developed and microspore vacuolized; Tapetum cells developed abnormally, giantized and crammed the anther chamber; Some tapetum cells developed normally, but PMCs developed abnomally, which deformed at sporogeneous stage, and then were abhensive each other and finally degenerated. Nearly no PMCs could complete the process of meiosis, and form the tetrad, leading to the failure of normal microspore development.

药室的绒毡层细胞不形成或提前解体；药室内的花粉母细胞不发育或小孢子液泡化；绒毡层细胞发育异常，出现巨型化而挤满整个药室；绒毡层细胞虽发育正常，但花粉母细胞发育异常，在造孢细胞时期即开始出现变形现象，随后发生粘连退化；绝大部分花粉母细胞不能完成正常的减数分裂过程形成四分体，导致小孢子退化。

Terminalization The movement of chiasmata to the end of the bivalent arms, a process that may occur during late prophase I of meiosis.

交叉移端：发生在第一次减数分裂后期，染色体交叉向二价体染色体臂的末端移动的过程。

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。