野苹果是我区特有的落叶果树,它耐早、抗寒,是优良的砧木材料。本文研究了野苹果种子在低温层积期间种皮透性,内源激素和各种酶活性的变化,物质代谢途径的转变,种皮解剖等特性。初步探明野苹果种子属生理性休眠,需经5～6℃低温层积才能完成生理后熟,胚已解除休眠的种子,其种皮透性仍很差,O_2的供应不足成为种子萌发的主要障碍。 Wild apple is my unique deciduous fruit trees, it is resistant to early, cold, is an excellent rootstock material. In this paper, the changes of seed coat permeability, endogenous hormones and various enzyme activities, changes in the metabolic pathways and the dissection of seed coat were studied during the cold acclimation period. Preliminary find that wild apple seeds are physiological dormancy, subject to 5 ~ 6 ℃ cold stratification in order to complete the physiological after-ripening, the embryo has been lifted dormant seeds, the seed coat permeability is still poor, O_2 lack of supply to seed germination The main obstacle.