二倍体

The formation and development of embryo sac in the diploid and its autotetraploid of rice cultivar IR36 was examined using Laser Scanning Confocal Microscopy.

利用激光扫描共聚焦显微镜术对水稻品种IR36二倍体及其同源四倍体的胚囊形成和发育过程进行了系统的研究。

In crossing of the 8 autotetraploidy rices (Oryza sativa, 2n=4x=48), APIV(4), IR36(4), Zixuedao(4), Ce 64(4), Minghui 63(4), IR28(4), Ce 90(4) and Gui 99(4) used as the females, with Pennisetum alopecuroides (2n=2x=18) used as the males, the seeds were obtained, but no seed was got in the crosses of the 3 diploidy rices (Oryza sativa, 2n=2x=24), APIV(2), Ce 90(2) and Zixuedao(2) used as the females, with Pennisetum alopecuroides.

利用APIV(4)、IR36(4)、紫血稻(4)、测64(4)、明恢63(4)、IR28(4)、测90(4)和桂99(4)等8个同源四倍体水稻(Oryza sativa， 2n=4x=48)为杂交母本，以狼尾草(Pennisetum alopecuroides， 2n=2x=18)为杂交父本进行杂交，获得了实粒种子。但是，在以APIV(2)、测90(2)和紫血稻(2)这3个二倍体水稻(Oryza sativa， 2n=2x=24)为杂交母本，以狼尾草为杂交父本的杂交组合中却没有获得实粒种子。

There are obvious difference on morphology and cytology between polypoid and diploid.

四倍体与二倍体在形态学和细胞学上有明显差异。

In some species there are diploid and polyploid varieties that look almost identical, though sometimes they may be referred to as separate species.

在一些同时具备二倍体和多倍体的物种中，虽然它们被认为是不同的独立物种，但它们的外形几乎是完全相同的。

The results showed that meiosis of the tetraploid melon was similar to that of diploid melon with some special behaviors.

结果表明：同源四倍体甜瓜花粉母细胞减数分裂过程与二倍体类似，但有其特殊性。

This paper also discusses the mechanism of occurrence of these aberrant embryos and discusses their relationship to diploid–tetraploid mosaicism.

文章也讨论了这种异常胚胎的发生机制，以及它与二倍体－四倍体嵌合体的关系。

The results indicated that both WUE and NUE increased during the evolution process from diploid to hexaploid.

结果表明，小麦在从二倍体→六倍体的长期进化过程中，WUE和NUE均表现出增加的趋势。

ABSTRACT Objective: To determine polysaccharide contents in different intervarietal of diploidy and tetraploidy Banlangen, and to provide scientific evidences for developing and utilizing resources of Banlangen.

第二军医大学学报991015 摘要目的：测定二倍体的不同品系与四倍体板蓝根中多糖的含量，为综合利用板蓝根资源提供科学依据。

Punctata have been confirmed to have both diploidy and tetraploidy.

punctata被证明同时含有二倍体和四倍体。

Compared with diploidy , the seedlings of Pasthyrostachys juncea with tetraploidy have stronger viability , higher nutrient contents and better tolerance of lower temperature , drought and other extremely environments .

与二倍体新麦草相比，染色体加倍后的四倍体新麦草的种苗生活力强，种子营养成分含量高，对低温，干旱等极端环境的适应能力强。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。