砂梨种子休眠原因与解除休眠方法的研究

Studies on Causes of Dormancy and Methods for Breaking Dormancy of Sand Pear Seeds

对砂梨（P．pyrifalia Nakai）种子休眠主要原因与解除休眠的主要方法进行了研究。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；而解除休眠的主要方法为低温层积处理和植物生长调节剂处理。裸层积和沙层积在解除种子休眠上的发芽效果是一致的，使用GA3溶液浸种，不能完全打破种子休眠，用GA3 500～1000mg／L低温层积30d即可解除种子休眠，比直接沙层积缩短30d，其发芽率比直接沙层积高。

The major causes of dormancy of sand pear seeds and the major methods for breaking it were studied. The results showed： the major causes were obstacle of seed vessel, seed embryo dormancy and postmaturation ; the major methods were treatments of hypothermal stratification and growth regulators ; naked layer stratification and sand layer stratification had cosistent effect on relieving seed dormancy; hypothermal stratification with GA3 500 ～ 1 000 mg/L for days could relieve seed dormancy, compared to sand stratification it shortened 30 days, and its germiation percentage was higher than that of sand stratification.