四倍体是指在细胞顶部包含4组染色体的细胞。
Tetraploidy means cells containing 4 sets of chromosomes atop.
报道了长牡蛎四倍体诱导的新技术。
建立了四倍体刺槐高效遗传转化体系。
The high efficient transformation system of tetraploid black locust has been established.
四倍体双穗雀稗兼性无孢子生殖的研究。
四倍体与二倍体在形态学和细胞学上有明显差异。
There are obvious difference on morphology and cytology between polypoid and diploid .
结实低而不稳是四倍体水稻育种遇到的重要障碍。
The critical problem encountered in the breeding work of autotetraploid rice is the low and unstable fertility.
综述了秋水仙素诱导葡萄四倍体研究的最新进展。
This article summarized the latest progress in grape tetraploid induced with colchicines.
同源四倍体水稻是二倍体水稻染色体加倍形成的。
Autotetroploid rice has double genome compared with diploid rice.
对297份人工四倍体桑种质的叶质进行养蚕鉴定。
The food value of leaves of artificially tetraploid mulberry (ATM) of 297 varieties was appraised in the silkworm rearing trial.
四倍体品系选育是甜菜多倍体育种不可缺少的重要环节。
It is extraordinarily important to select tetraploid lines for breeding sugar beet polyploid varieties.
因此，研究中国四倍体小麦的亲和性问题具有特殊的意义。
Thus, it is important that elucidate the genetic control of the crossability of Chinese tetraploid wheat with rye.
纯合的四倍体是一个相对平衡的系统，继续选择是无效的。
Homozygous tetraploid is a relatively balanced system, the continued selection is invalid.
为四倍体大燕麦和六倍体裸燕麦杂交提供了细胞胚胎学证据。
Cytoembryological evidence was provided for crosses between Avena magna and Avena nuda.
通过四倍体的自群繁育，建立了稳定的太平洋牡蛎四倍体群体；
Meanwhile the author used he method that self-reproduction in tetraploid Pacific oyster to build the tetraploid population.
对7个葡萄二倍体与四倍体杂交组合的胚珠进行离体培养研究。
In vitro of ovules in 7 cross combination between diploid and tetraploid cultivars of grape were studied in this experiment.
它们是复杂的多倍体，其中一部分是四倍体，一部分是六倍体。
They are complex polyploids, being partly tetraploid and partly hexaploid.
利用四倍体胚胎补偿技术就可以得到完全由ES细胞发育而来的小鼠。
Thus, we can obtain the ES mouse completely from ES cells with the method of tetraploid embryo complementation.
结果显示：结构完整的细胞DNA的荧光点图形成二倍体、四倍体的区域。
Dot plot image of DNA fluorescence could form region of diploid and tetraploid in integrated cell.
本试验研究了高粱同源四倍体与约翰逊草远缘杂交的结实性及其后代表现。
This paper studied the fertilization of the hybrid between autotetraploid sorghum and Johnson grass and the genetic characters of the hybrid generation.
除此之外还研究了四倍体植株叶片的光合速率、气孔导度的日变化的情况。
Apart from this study, we also researched photosynthesis, stomatal conductance of the tetraploid plants and the control ones.
以叶片为外植体，建立了同源四倍体兰考泡桐和白花泡桐体外植株再生系统。
The system of vitro plantlet regeneration from the leaves of tetraploids of Paulownia elongate and Paulownia fortunei was established.
以异源四倍体鲫鲤为父本，二倍体金鱼为母本通过倍间杂交形成三倍体鲫鱼。
The early embryonic development of triploid crucian carp which was generated by mating the males of the allotetraploid hybrids of red crucian carp(Carassius auratus red var.
染色体检查发现，除了四倍体之外，还存在其它倍性的细胞，呈嵌合体状态。
Chromosome count showed that the plants, containing non tetraploid cells besides amphidiploid, were chimeras.
这些类型都是高度不育的，正如由基本的二倍体衍生三倍体和同源四倍体一样。
These forms are highly sterile, as would be expected of triploids and of autotetraploids derived from basic deploids.
目的探讨四倍体胚胎发育阶段对胚胎干细胞（ES）嵌合体小鼠制备的影响。
Objective To investigate the effects of developmental stages of tetraploid embryos on mouse chimeras from embryonic stem cells (ES).
从1939年获得第一个四倍体西瓜以来，多倍体育种就一直是西瓜育种的一个热点。
Since the first tetraploid was obtained in 1939, polyploidy breeding has always been the focus of watermelon breeding.
从1939年获得第一个四倍体西瓜以来，多倍体育种就一直是西瓜育种的一个热点。
Since the first tetraploid watermelon was obtained in 1939, polyploidy breeding has always been the focus of watermelon breeding.
利用常规肌肉营养分析方法测定了四倍体泥鳅、二倍体泥鳅和大鳞副泥鳅的肌肉营养成分。
Nutritional composition in muscle of tetraploid loach, diploid loach and Paramisgurnus dabryanus were determined by using conventional method.
本研究为优良同源四倍体桔梗的推广应用和优良种质离体保存、减少遗传变异提供了技术依据。
This research provided techniques for the application, conservation in vitro of excellent germplasm and reduction of heredity variance of autotetraploids of Plalycodon grandiflorum.
本研究为优良同源四倍体桔梗的推广应用和优良种质离体保存、减少遗传变异提供了技术依据。
This research provided techniques for the application, conservation in vitro of excellent germplasm and reduction of heredity variance of autotetraploids of Plalycodon grandiflorum.
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