摘要
讨论了川渝地区9个有代表性的乌桕天然群体群体间和群体内的表型多样性。每个群体30个家系(单株)为试验材料,对16个种实表型性状采用方差分析、多重比较、变异系数比较、重复力比较、相关分析和聚类分析等统计分析方法。结果表明,乌桕种内表型性状在群体间和群体内存在极其丰富的遗传变异,种子的质量性状比种子形状指数性状稳定,各种实性状的变异系数变幅为6.84%～39.54%,平均为16.78%;不同性状的重复力变幅为0.31～0.98,平均为0.61。群体间表型分化系数变异幅度为6.71%～42.72%,平均为25.47%。说明乌桕种实群体内的变异(74.53%)显著高于群体间的变异(25.47%);16个种实表型性状间多数呈极显著或显著相关;乌桕种内群体的种实表型变异在空间分布上呈现出以纬度为主的单向变异模式,变异主要受低温控制;利用群体间欧氏距离进行UPGMA聚类分析,可将乌桕群体划分为4类。
Researches were conducted on the inter-population and intra-population phenotypic diversity of nine representative natural Sapium sebiferum populations in Sichuan and Chongqing areas.Every group of 30 families（individuals） were chosen as the experiment materials,and statistical analysis methods such as variance analysis,multiple comparison,variation coefficient comparison,repeatability comparison,correlation analysis and cluster analysis were adopted to explore the phenotypic diversity of sixteen seed phenotypic character of Sapium sebiferum.The results showed that the intraspecific seed phenotypic character of inter-population and intra-population Sapium sebiferum had profuse genetic variation.The qualitative character of seeds was more stable than the shape index.The variation coefficient of different seed character ranged from 6.84% to 39.54%,with the average of 16.78%.The repeatability of each seed character ranged from 0.31 to 0.98,with the average of 0.61.The inter-population phenotypic differentiation coefficient ranged from 6.71% to 42.72%,with the average of 25.47%.The intra-population phenotypic differentiation（74.53%） was significantly higher than the inter-population＇s（25.47%）.Most of the sixteen seed phenotypic characters were significantly correlated.The seed phenotypic variation of intra-population Sapium sebiferum presented one-way variation pattern with latitude in space distribution,and the variation was mainly controlled by low temperatures.According to UPGMA cluster analysis by inter-population Euclidean distance,the nine populations of Sapium sebiferum could be classified into four types.
出处
《四川林业科技》
2011年第6期19-27,共9页
Journal of Sichuan Forestry Science and Technology
基金
四川省植物资源共享平台建设科技条件专项(206053)
关键词
乌桕
天然群体
种实性状
表型变异
Sapium sebiferum
Natural population
Seed traits
Morphological variation
