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
- Callose exists mainly in transverse walls during dyad, triad and tetrad stages, a little in side walls.
二分体、三分体、四分体时期，胼胝质荧光主要存在于大孢子之间的横壁上，侧壁内胼胝质荧光较弱。 - 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； - 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 results are as follows: During anther early development, only few ATPase precipitates located in small vacuoles and the nucleus of microspore mother cell and tetrad microspore.
结论如下：在花药发育过程中，小孢子母细胞和四分体内的ATPase很少，仅在细胞核及小液泡中分布有少量的ATPase。 - In the course of the embryonic development, after the microspore tetrad is formed, although some forms of the microspore were under developed, and lose of protoplasm, but some have formed normal microspore.
在胚胎发育过程中，小孢子四分体形成后，虽然出现有些小孢子形状不规则，原生质少或无等现象，但也有发育正常的花粉粒。 - Otherwise, the chromosome morphology involving Haynaldia chromatin was observed at preleptotene I, and the frequencies of chromatin nucleus at tetrad stage and at microspore stage were investigated.
此外，观察了前期I的簇毛麦染色体形态，统计了四分体和小孢子中小麦和簇毛麦染色质微核频率。 - In tetrad stage, the structures of tapetal cells begin to dissociate.
四分体时期，绒毡层细胞内部结构开始解体。 - Abnormal tetrad rates in different generations were 0.16, 0.13 and 0.36 respectively.
异常四分体频率各代分别为0.16、0.13和0.66。 - It appears however that the formation of megaspore tetrad associated with the high GA3/ ZT ratio.
高水平的ZT/IAA有利于大孢子母细胞和花粉粒的形成，而大孢子四分体的形成则需要高的GA3/ZT比值。