Seed dormancy of Trillium camschatcense requiring 21 months from seed dispersal to cotyledon emergence

为了解苦参种子从种子传播到子叶萌发需要长达21个月的时间的原因，研究了苦参种子胚生长、胚根萌发和子叶萌发对温度和光照的要求。种子内胚在种子传播时未发育。第一个低温是胚生长和胚根萌发所需要的，第二个低温是子叶从产生根的种子萌发所需要的。恒温和光照条件下胚根出苗率高于交变温度和光照条件下。

To know the reason why seeds of Trillium camschatcense need long periods for 21 months from seed dispersal to cotyledon emergence, temperature and light requirement for embryo growth, radicle emergence, and cotyledon emergence of seeds were revealed. Embryos in seeds were undeveloped at seed dispersal. The first low temperature was required for embryo growth and radicle emergence, and the second low temperature was required for cotyledon emergence from seeds producing roots. Percentages of radicle emergence at constant temperature or in dark were higher than at alternating temperature or in light.