Microspore abortion occurred after the tetrad formation.
小孢子败育发生在四分体形成以后。
2
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。
3
The results showed that microspore mother cells and tetrad microspores accumulated numerous lipids but no starches.