四倍

These so-called tetraploid cells can go on to form placental tissue but cannot thrive in the embryo proper.

这些四倍体细胞可以继续组成胚胎组织，但不能成长为胚胎。

A rapid and high efficient protocol has been established for Agrobacterium-mediated transformation of microtuber of potato tetraploid cultivars.

以马铃薯四倍体栽培品种的试管薯为受体材料，建立了根癌农杆菌介导的马铃薯试管薯快速、高效转基因体系。

Apparently, every year he went through the change from one form to the other, but had only recently realized he was tetraploid, and hadn't yet figured out the connection between the two.

/ 显然地，每年他经过从一种形式到另一个的改变，但是只有最近有了解他是四倍体的，而且没有理解之间的连结那二。

In conclusion, abnormal meiosis of PM-Cs is the cytogenetic causes for fertility reduction of tetraploid melon.

花粉母细胞减数分裂的异常是同源四倍体甜瓜育性低的细胞学原因。

Are in the mature, tetraploid varieties, the varieties of the main characteristics of high grass production, especially in the second year of planting forage yield is much higher than other ...

属于中熟、四倍体品种，该品种的主要特点是草产量很高，尤其是种植第二年的草产量远高于其它。。。

These structural change constitute the physiological mechanism of improvement of yield in tetraploid.

这些结构变异构成了人工四倍体新桑品系产叶量高、产果量高的结构基础。

This may be due to the characteristics of soybean genome,an ancient tetraploid.

这些基因位于10条不同染色体上，FT类基因具有成对排列于同一条染色体的短的区段的倾向，TFL1和CEN的4个不同拷贝均位于不同的染色体上。7对基因之间同源性高于90%，而且多位于不同染色体上，可能与大豆古四倍体的特性有关。4。

Toxicity of chemicals and break or deficiency ofchromosomes could be the important cause of high deathrate in the tetraploidy embryos of abalone.

化学药物的毒性作用和染色体的断裂或缺失，可能是导致皱纹盘鲍四倍体胚胎死亡率高的重要原因。

In 8 cases, both the results were consistent excepting for minor discrepancies.③In 3 cases, including 2 each with triploidy and tetraploidy respectively, and one with chimeric karyotype of normal/+22, the results from the two methods were discrepant.

CGH与常规R带的分析结果比较可分为三种：①CGH和常规核型分析结果完全一致的有3例；②CGH分析和R带分析从不同角度提供了相对一致信息的有8例；③CGH分析和R带分析结果不一致的有3例，其中2例分别为约三倍体和约四倍体，另1例为正常/＋22嵌合型。

Variation of tetraploidy was observed among the regenerants from culture of immature cotyledons,cotyledons and leaves of melon seedlings.

甜瓜未成熟子叶、幼苗子叶和真叶离体培养的再生植株中存在着明显的四倍体变异，比率分别为30%、16.2%和 42.9%。

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。