青檀种子休眠机理及发芽条件的探讨  

A study on mechanism of dormancy and germination condition of Pteroceltis tatarinowii Maxim. seeds

作　　者：洑香香[1] 方升佐[1] 杜艳[1] 

机构地区：[1]南京林业大学,江苏南京210037

出　　处：《植物资源与环境学报》2002年第1期9-13,共5页Journal of Plant Resources and Environment

基　　金：国家自然科学基金资助项目 (项目编号 :39970 6 0 8)

摘　　要：对青檀 (PteroceltistatarinowiiMaxim .)种子的休眠机理和发芽条件进行了探讨。共设定 5个处理 :剪破种皮、热水处理 (4 0、5 0、6 0和 70℃ )、剪破种皮并变温层积 (0～ 4℃ 16h与 10～ 15℃ 8h)、低温层积 (0～ 4℃ )和变温层积(0～ 4℃ 16h与 10～ 15℃ 8h)。结果表明 ,剪破种皮、剪破种皮并变温层积和热水处理与对照的发芽率均无显著差异 ,说明青檀种子的休眠不是种皮限制所引起的。低温层积和变温层积处理均能打破种子的休眠 ,因而认为青檀种子休眠属于生理休眠。低温层积以 70d为最好 ,发芽率和发芽势分别达 6 7%和 5 5 % ;变温层积以 40d处理效果最好 ,发芽率和发芽势分别达 77%和 5 7%。同时还讨论了The mechanism of dormancy and germination condition of Pteroceltis tatarinowii Maxim. seeds were studied. There were five treatments: sacrification seed coat; treatment with 40, 50, 60 and 70℃ hot water respectively; sacrification seed coat combining with temperature-accelerated stratification (0-4℃ 16 h and 10-15℃ 8 h); cold stratification (0-4℃) and temperature-accelerated stratification (0-4℃ 16 h and 10-15℃ 8 h). The results indicated that: there are no significant difference in percentage germination between hot water treatments and control. It meant P. tatarinowii seed is not hard seed. Because both cold stratification and temperature-accelerated stratification treatments can overcome the seed dormancy, we deduced that the dormancy of seed of P. tatarinowii was caused by physiological factors. The optimal treatment of cold stratification was 70 days with percentage germination and germination power of 67% and 55%, respectively, while temperature-accelerated stratification for 40 days with percentage germination and germination power of 77% and 57%, respectively. The advantages and disadvantages of two stratification treatments are also discussed.=

关 键 词：青檀种子 休眠机理 发芽 低温层积 变温层积 

分 类 号：S792[农业科学—林木遗传育种] Q945.35[农业科学—林学]