Causes of seed dormancy and polymorphism of dormancy were summarized in this paper. 摘要概述了植物種子休眠的原因及種子休眠的多形性。
Dormancy for hard seeds is caused by impermeability to water and gas and mechanical constraint of the seed coat. 硬實(shí)種子種皮透水透氣性差和對胚生長(cháng)的機械限制，引起種子休眠。
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