摘要
目的:研究明党参种子的休眠机制和最佳发芽条件,为明党参种子检验提供依据。方法:在25,20,15,10,5℃下层积处理明党参种子,每隔10 d观察种子胚的形态变化,并测定种子的胚长和种子霉烂率。分别在以上5个温度下进行明党参种子常规萌发实验,发芽基质为纸床和砂床,测定发芽开始时间、发芽持续时间、发芽率和发芽势。结果:15℃层积下胚生长最快,10℃和5℃下前期生长较慢,但后期生长加快,20℃以上发芽受到明显抑制。25,20,15,10℃下霉烂率较高。5℃层积处理45 d既能较快打破休眠,又能降低霉烂率。在10~15℃纸床条件下发芽最快,发芽率和发芽势最高。结论:明党参种子的休眠以形态休眠为主;温度是影响明党参发芽的主要因素。明党参种子的最佳前处理方法为5℃层积45 d;最佳发芽基质为纸床;最佳发芽温度为10~15℃。
Objective： To study the seed dormancy mechanisms and the optimal seed germinating conditions, so as to provide basis for the seed testing of Changium smyrruioides. Method： Put the seeds into wettish sand under temperature of 25,20, 15, 10,5℃, observe the shape changing of embryo and measure its length every other 10 days. Carry on experiments of seed germination under temperature of 25,20, 15,10,5 ℃ on the paper bed and sand bed, determine the time of germination starting, time of germination lasting, germination rate and germination energy. Result： F_znbryo grew the most quickly under 15 ℃. The seed germination was largely prohibited when the temperature is higher than 20 ℃, The mildew rate was very high under 25,20,15,10 ℃. Put the seeds under 5℃ for 45 days could quickly break off its dormancy, and its mildew rate was lower. The seeds germinate fastest under the condition of 15-10 ~C on the paper bed,and its germination rate was the highest. Ctmcht^on： The morphological post-maturation seems the major dormancy mechanism of C. smyrnioides. Temperature is a major factor that affect seed germination of C. smyrnioides. The best pretreatment method is to put the seeds into 5 ℃ of wettish sand for 45 days. The best germination bed is the paper bed, and the best germination temperature is 15-10℃.
出处
《中国中药杂志》
CAS
CSCD
北大核心
2006年第3期197-199,共3页
China Journal of Chinese Materia Medica
基金
国家科技攻关计划项目(2001BA701A59
2001BA701A62-04)
关键词
明党参
种子
休眠
发芽
Changium smyrnioides
seed
dormancy mechanisms
germination
