The sensitive period was at latestage during the embryo development.
雌蚕高温干燥条件的敏感性，主要发生在胚胎发育至后期阶段。
2
Therefore, the embryo dormancy is acquired in latestage of seed development.
因此，胚休眠主要在发育后期获得。
3
There were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.