tetrad
英
美
网络 四分体; 四联球菌; 四联体; 四分子; 四分孢子
复数：tetrads
英英释义
noun
- the cardinal number that is the sum of three and one
双语例句
- Pollen abortion of MS-4 was in the single nucleus pollen grain stage after the division of microspore tetrad.
MS-4花粉败育的时期，是在小孢子四分体分开至单核花粉粒时期。 - The tetrad analysis of some hybrids led the discovery of two complementary genes systems.
通过四分体分析发现一些杂种有两种互补基因系。 - The process of pollen abortion begins with vacuole formation and gradual enlargement in the tetrad.
花粉败育的过程从四分体开始，细胞质内液泡逐渐增大，接着细胞器解体，细胞核解体。 - First, we construct the symmetrized null tetrad from which the spin coefficients and Dirac equation are derived.
首先，构造对称化零标架，计算旋系数，导出Dirac方程，并对其进行化简。 - There is only one layer of parietal cells at the stage of sporogenous cell, megaspore mother cell and tetrad.
造孢细胞，大孢子母细胞和四分体时期，周缘细胞仅1层。 - Our main results were as follows: the ovary of male I degenerated and disappeared quickly upon megaspore tetrad degeneration, and developed into macrosporocytes;
结果发现：色木槭一期雄花（雄I）在大孢子四分体退化形成功能性大孢子时期，子房萎缩并迅速退化消失； - Chromosomes out of nuclei can be seen both at prophase ⅱ and tetrad period.
前期Ⅱ和四分体时期可观察到核外染色体； - Tapetum cell hyperplasia from the tetrad to the single nucleus early period.
绒毡层细胞在四分体&单核早期发生增生； - At both tetrad and pollen mother cell stages, the amount of polysaccharides in pollen cells of male sterility line was slightly higher than that of its maintainer lines.
在花粉母细胞和四分体时期，不育系细胞中多糖物质的含量稍高于保持系细胞中的含量，但它们之间差异不显著。 - The abnormality of tetrad callose wall degradation and tapetum development was associated with the abortion of microspore.
导致小孢子败育的原因与四分体胼胝质壁不适时解体和绒毡层细胞发育异常、延迟解体有关。