四倍

That indicated the availability of SRAP technique in studying genetic variability in Arachis. Estimates of genetic distance among the 28 accessions Arachis section ranged from 0.12 to 0.75 with average genetic distance of 0.42. A genetic distance clarified that A-genome A. duranensis was most closely associated with tetraploid germplasm, which could be A-genome donors. Dendrogram of cluster analysis classified 28 accessions Arachis section into two groups: one including tetraploid germplasm, and A.

聚类分析表明，28份花生材料间的遗传距离变幅为0.12~0.75，平均为0.42，A基因组物种Arachis duranensis与栽培种花生的亲缘关系最近，可能是栽培种花生的A基因组的供体。28份种质分为两大类，第一大类包含四倍体种质及A基因组的A。

As soybean Glycine max (Linn Merril has archean tetraploid chromosomes(2n=40) and belongs to Leguminosae, it is one of the most important resource of plant oil and protein for human beings, many scientist have attached more importance to the genetic soybean.

大豆Glycine max(LinnMerril属豆科蝶形花亚科大豆属的古四倍体(2n=40)植物，是世界上植物油和植物蛋白最重要的来源之一。因此，科学家高度重视大豆的品种改良。

Study on reproductive characters of autotetraploid rice.

同源四倍体水稻的生殖特性研究。

But no autotetraploid variety occurs in nature.

但自然界还没有一个同源四倍体种。

Objective To establish a tissue culture system of Pueraria thomsonii and to cultivate a new breed autotetraploid.

目的 建立粉葛的组织培养体系；培育粉葛同源四倍体新种质。

The low seed setting percentage is the most important reason that limits the application of the autotetraploid rice.

同源四倍体水稻结实率偏低是影响其在育种中直接应用的重要原因。

So, the abnormality of embryo sac was one of the factors that induce low seed setting percentage in autotetraploid rice.

从对13个品种的成熟胚囊育性调查的结果来看，同源四倍体水稻胚囊育性是影响其结实率的原因之一。

The autotetraploid gives a chance to improve the content of medical materials in the root of P. thomsonii.

同源四倍体粉葛为葛根中药用物质质量分数的提高提供了基础。

Biological effects of autotetraploid rice after ion beam implantation of low energy N+ were studied.

以低能氮离子束为诱变源，对同源四倍体水稻进行注入处理后，对其生物学效应进行了研究。

The autotetraploid plant of sesame may be effectively induced by immersing seeds with 0.3%-0.5%colchicine water solution under 28 ℃ for 24 hours.

在28 ℃的条件下，用0.3%～0.5%的秋水仙素水溶液浸种24 h，诱发产生芝麻同源四倍体的效果较好。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。