Effect of Cold Stratification Durations and Germination Temperatures on Seed Germination of Sorbus Pohuashanensis

Germination of Sorbus pohuashanensis stratificated seeds at six germination temperatures was studied.The results showed that the suitable durations of stratification for dormancy removing were 120 days for newly collected seeds or 105 days for longtime cold stored seeds respectively.Dormancy removing seeds could germinate at 5-25 ℃.In this temperature range,seed germinate percentage increased with the increased of temperature,but seeds could not germinate and induce secondary dormancy when temperature is over 25 ℃.Germination percentage and germination value of dormancy removing seeds were higher but germination processes lasted longer at 5 ℃ and 10 ℃.