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作 者 ：许晓岗，丁芳芳*，李 翔，汤庚国

期 刊 ：西北植物学报 2012年 11期 页码：2270~2278

关键词：东京野茉莉；种子；休眠；破眠方法；GA3；

Keywords:Styrax tonkinensis, seed, dormancy, dormancy breaking methods, GA3,

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30 d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500 mg/L GA₃处理24 h为破除该种子休眠的最有效方法。

Abstract: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 implemented 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.

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