因此，胚休眠主要在发育后期获得。

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

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结果表明，引起砂梨种子休眠的主要有种皮障碍、种胚休眠和种胚后熟；

The results showed: the major causes were obstacle of seed vessel, seed embryo dormancy and post-maturation;

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种子休眠主要有两种休眠类型即由种皮引起的休眠和由胚引起的休眠。

There are basically two categories of dormancy, the one of which is caused by seed coat, the other of which is caused by embryo.

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