tetrads
英
美
网络 四联球菌; 四分体; 四元组; 四体花粉
双语例句
- Predominant linear and a few "T"-shaped megaspore tetrads with chalazal functional one; The first one towards the chalazal end of four megaspores that are arranged in one row is functional.
少数为T字形排列，合点端大孢子有功能；直线形大孢子四分体，合点端大孢子有功能，三次核分裂的单孢子胚囊类型（蓼型）。 - Cytological analysis showed a large number of abnormal tetrads in mutant anther, especially hexads, pentads and irregular tetrads, which indicated abnormalities in meiosis.
细胞学观察发现突变体的花药中形成大量异常的四分体，特别是六分体、五分体和不规则的四分体，这表明突变体的减数分裂可能出现问题。 - Cytological observation on the transgenic plants indicated that abortion of microspore development occurred at the stages of from tetrads to uninucleate.
通过对转基因植株进行细胞学染色、切片观察等方法，显示转基因后代小孢子败育发生在四分体到单核期。 - The shapes and forms of tetrahedral tetrads grains may be described with a new method of polar coordinate that is more exact and more direct than with traditional measurement method of polar axis ( P) and equatorial axis ( E).
用极坐标法描述四合体花粉的新方法可以表现其饱满度，比较传统上用极轴、赤道轴的长短表现花粉平面大小的方法，更加准确而直观。 - Hypertrophy and hyperplasia of tapetum at tetrads stage were related to pollen abortion.
四分体时期绒毡层肥大增厚可能与花粉败育有关。 - It is not clear whether the abortion of the tetrads stimulates proliferation of the tapetal cells or the proliferating tapetum actually interferes with microspore development, thereby causing degeneration.
由于绒毡层细胞异常膨大，挤压四分体，四分体不分离产生四分小孢子，从而不能形成正常的花粉粒而导致败育。 - Most macrospore tetrads are linear and a few are T-shaped;
大孢子四分体多数为直线形排列，少数为T字形排列； - The insoluble polysaccharides are at very low level in the MMC, tetrads and functional megaspore stages while RNA and protein are at higher level in all of them.
大孢子母细胞、大孢子四分体及功能大孢子中含较少不溶性多糖，但却含丰富的RNA和蛋白质。 - The meiosis behavior of pollen mother cell of sterile plant was normal and tetrads were formed. However degradation of tetrad callose wall was abnormal.
不育株花粉母细胞减数分裂过程基本正常，可形成四分体，但四分体胼胝质壁不能适时解体，小孢子或于胼胝质壁内彻底败育解体，或发育至单核中期败育； - Cytokinesis in the MMC accompanies meiosis and the megaspore tetrads are linear or T-shaped.
大孢子四分体为直线形或T形排列。