The sensitive period was at late stage 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。

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Therefore, the embryo dormancy is acquired in late stage of seed development.

因此，胚休眠主要在发育后期获得。

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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.

珠心细胞只有两层，细胞核大，胞质丰富，内含贮藏物质，至心形胚期逐渐解体。

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