【摘要】 目的:研究甘草种源种子形态特征与萌发特性的地理变异规律,探讨地理变异模式和生态学机制,为甘草种子区划和种子调拨奠定理论基础。方法:现地调查收集种源种子材料,随机抽样测定形态和千粒重,通过室内发芽实验观察种子萌发特性。结果:甘草的种子形态特征大致呈现自西向东,种粒逐渐增大的经向变异趋势。发芽特性呈现随海拔高度的增加,种子的发芽率和发芽势增加,平均发芽速度加快的垂直变异趋势,并且平均发芽速度呈现自西向东发芽时间逐渐延长的经向变异趋势。与气候因子的相关分析结果表明,甘草种源种子的种粒大小与该产地年降雨量呈显著正相关,种子发芽速度在干旱、高温、强日照生态环境下加快的变异趋势。结论:甘草种子形态特征和萌发特性存在显著的地理变异,地理变异的形成与种源适应该产地的生态环境有关。更多还原

【Abstract】 Objective:To study the geographical variation of morphologic and germination characteristic of different Glycyrrhiza uralensis provenance seeds,approach the geographical variation mode and ecology mechanism,and laid theoretical foundation for districting and allocating of G.uralensis seeds.Method:Field investigation and laboratory analysis were applied.Seed shape and kilos-seed weight were sampled randomly,germination rate germination force by general methods.Result:The morphologic characteristic of G.uralensis seeds showed roughly longitude variation tendency that the seeds increased gradually from west to east.While the germination characteristic showed roughly altitude variation tendency that the seeds germination rate and germination force increased with the increase of the altitude,and the average germination rate was the same with the seeds morphologic characteristic.The results of analysis correlated with the climatic factors show that the morphologic characteristic of G.uralensis was positive correlated with annual rainfall of the habitat,and the germination rate was quickened by drought,high temperature and strong sunshine.Conclusion:The morphologic and germination characteristic and of G.uralensis seeds present distinguished geographical variation,and the formation of the variation was related to the ecological environment in which the seed provenance adapted.更多还原