摘要
以采自江西吉安官山林场5年生东京野茉莉当年自然带壳种子为材料,通过对其种子吸水率、不同层积时期种子内生理生化指标的测定、种子萌发抑制物分析,并利用各类不同药剂处理进行发芽试验,以探寻东京野茉莉种子的休眠机理及破眠方法。结果表明:(1)休眠的原因主要包括种皮障碍、缺少萌发所需激素以及种皮、胚中存在萌发抑制物,其中种皮障碍和抑制物的存在是限制种子萌发的首要因素。(2)GA3处理结合自然低温层积30d即可解除东京野茉莉种子胚的休眠,但种皮障碍始终是其种子萌发的限制因素。(3)GA3、NAA、6-BA等药剂处理均可促进种子的萌发,并以刻伤种子后用500mg/L GA3处理24h为破除该种子休眠的最有效方法。
The objective of this work was by testing imbibition, seed germination, some physiological indices between the different stratification time and germination inhibitor assay; chemical treatments were imple- mented to reveal the seed of dormancy mechanism and to research the effective dormancy breaking method of Styrax tonkinensis seeds with shells,which was 5 years form guanshan forest farm in Ji＇an Jiangxi. The results indicated that.（1）The reason of seed dormancy includes episperm barrier, deficient of germination hormones and germination inhibitors existing in both embryo and episperm; and episperm barrier and the existence of germination inhibitors are the primary limit factors. （2）The embryo dormancy of S. tonkinensis can be relieved after GA3 treatment and stratification at natural low temperature for 30 days,but episperm barrier is always the key constraint factor for its dormancy. （3）The chemicals such as GA3 ,NAA and 6-BA etc. treatments were used to improve the germination rate of S. tonkinensis seeds;one of the effective ways is by 500 mg/L GA3 treatments 24 h for the carved seeds.
出处
《西北植物学报》
CAS
CSCD
北大核心
2012年第11期2270-2278,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
2011南京六合重大科技项目(2011)
关键词
东京野茉莉
种子
休眠
破眠方法
GA3
Styraz tonkinensis
seed
dormancy
dormancy breaking methods
GA3
