小桐子居群种子表型变异研究

Study on Phenotypic Variation of Seed Populations in Jatropha curcas L.

对小桐子8个居群种子表型进行研究,测量种子长度、宽度、重量等11项形态学指标。种子表型性状,居群间的变异系数c.v.%=10.64~19.33,表型频率分化系数平均Pst=10.02%,表型方差分化系数平均Vst=14.27%,表明小桐子种子表型居群内变异是其变异的主要来源。居群间欧氏距离Q-聚类分析表明,种子表型分化基本与居群间的地理距离远近相关联。11个表型性状间多数呈极显著或显著的正相关,种子长度、宽、厚、周长和种子百粒重为小桐子易测定和重要的表型性状。

The seeds were collected from 8 populations of Jatropha curcas L..Based on the data of 11 seed phenotypic traits,the phenotypic differentiation of seeds was studied in the 8 populations sampled.The phenotypic traits of seeds showed a certain differentiation among populations of J.curcas.The average coefficient of variation ranged from 10.64 % to 19.33 % among the populations sampled,with the mean variation differentiation coefficient of phenotypic trait（Vst） being 14.27 %.The mean frequency multiplicity coefficient of phenotypic trait（Pst） was 10.02 %,revealing the phenotypic variation within population was the main part of the morphological variation of seeds.The phenotypic traits of seeds among populations showed some certain differentiation,with such differentiations correlating with the geographic distance among populations according to the UPGMA cluster analysis.The seed length,seed width,seed thickness,seed perimeter and weight per 100 seeds were the most important phenotypic traits which were easy to be measured in investigation.