四分体时期，绒毡层细胞内部结构开始解体。
In tetrad stage, the structures of tapetal cells begin to dissociate.
四分体时期出现二分体、三分体、含微核的异常四分体及多分体。
At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.
当花萼包住花瓣、萼长于瓣、花药白绿色时，多数小孢子处于四分体时期或单核早期；
When the calyx is encased by petal, the calyx is longer than the petal, and the anther is greenish white, most of the microspore is at the earlynucleate stage.
在四分体和成熟胚囊时期观察到了异常发育现象。
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。
Abnormal development was observed at tetrad and mature embryo sac.
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