1·Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形，合点端功能大孢子发育成为蓼型胚囊。
2·This phenomenon occurs in the early tetrad stage.
这个现象在早期四分体阶段出现。
3·Abnormal development was observed at tetrad and mature embryo sac.
在四分体和成熟胚囊时期观察到了异常发育现象。
4·The micronuclei were not observed in tetrad stage.
四分体阶段无微核出现。
5·Micronuclei were observed in the tetrad stage.
四分体阶段有微核。