银钟花种子休眠和萌发的初步研究

Preliminary Study on Dormancy and Germination of Halesia Macgregorii Chun Seeds

银钟花种子种皮约占种子风干重 93%。种子透水性良好。大粒种子酸蚀处理 4 .5小时后 ,重量减轻 6 2 .5 %。小粒种子则以 1.5小时为好。经酸蚀处理后的种子 ,再用 5 0 0 mg· L- 1 GA3处理后 ,在室外层积一冬 ,发芽率可达 72 .9% ,而风干种子则颗粒未发。破除休眠的种子 ,萌发温度以 2

The seed coat, which is about 93% the total weight of air dried seed of Halesia macgregorii Chun, is permeable by water. After big seeds of the pretreatment by H 2 SO 4 for 4.5 hours, it reduced the weight of the seed by about 62.5%.Small seeds should be treated with H 2 SO 4 for 1.5 hours. If the seeds were soaked with 500mg·L -1 GA 3 and stratified over winter, the pretreated seeds had 72.9% germination, while the control seeds did not germinate. After breaking dormancy the best temperature of germination was 25℃.