山东稀有植物小果白刺天然群体表型变异研究

[目的]研究山东小果白刺的表型变异程度及变异规律。[方法]采用方差分析、相关分析、聚类分析等分析方法,对山东小果白刺5个群体种实和叶片的10个表型性状进行了比较分析。[结果]群体内变异是山东小果白刺表型变异的主要来源;各性状群体间表型分化系数的变幅为20.20%60.70%,平均值为40.71%;所有性状的变异系数平均值为9.34%,各器官的表型变异程度有叶片大小(8.99%)﹥种子大小(7.74%)﹥果实大小(6.77%)和种子形状(10.22%)﹥叶片形状(6.70%)﹥果实形状(4.35%);小果白刺10个表型性状间大多呈显著或极显著的相关关系;5个小果白刺群体被聚合成2类。[结论]山东小果白刺种实及叶片表型性状在群体间和群体内存在丰富的表型变异,其地理变异规律遵照随机变异模式。该研究结果为小果白刺种质资源的保存提供了依据。

Phenotypic Variation of Nitraria sibirica Natural Populations in Shandong

[Objective]To figure out the degrees and laws of phenotypic variation of Nitraria sibirica in Shandong Province. [Method]10 phenotypic traits about fruit and leaf of five N. sibirica populations in Shandong Province were analyzed by the methods of variance analysis, correlation analysis, and cluster analysis, etc.[Result]The variation within populations was proved as the main resource of the phenotypic variation. The phenotypic differentiation coefficients among the populations varied from 20.20% to 60.70%, with an average value of 40.71%. The average variation coefficient for all the traits was 9.34%. The relationship of the phenotypic variability degrees for different components are as follows:leaves size (8.99%) > seeds size (7.74%) > fruits size (6.77%) and seeds shape (10.22%) > leaves shape (6.70%) > fruits shape (4.35%). Most of those traits were significantly correlated with one another. The five N. sibirica populations were then clustered into 2 groups. [Conclusion]The results showed that extensive genetic variations were detected both within and among the five N. sibirica populations, whose geographic variations were in accordance with the random variation mode. These results could afford basis for protecting germplasm resources of N. sibirica.