紫丁香195个实生单株花表型性状变异分析

为了准确掌握紫丁香资源花部性状的变异程度及表型多样性水平,为紫丁香优良品种的选育提供理论依据。本研究以195株紫丁香实生单株为材料,对其5个数量性状和4个质量性状的变异、性状间相关性和聚类关系等进行了分析。结果表明,5个数量性状在群体内表现出极显著差异(P<0.01),且符合正态分布,变异系数为19.72%~30.22%,平均24.97%,其中花序长变异最大;根据ISCC-NBS色彩名称表示法将群体花色划分为白色系、浅粉色系、紫色系、紫红色系、紫粉色系和蓝紫色系等6个色系,其中紫色系(54.35%)和紫红色系(32.31%)所占比例最大;4个质量性状的多样性指数为0.36~1.09,平均0.86,其中花冠裂片(状态)最大,表明群体中质量性状变异类型丰富。相关性分析表明,5个数量性状之间均呈现极显著正相关,其中花序长与花序宽相关系数最大,为0.767。聚类分析表明,195株紫丁香基于欧氏距离可分为3大类,第一类群主要性状表现为花冠筒长;第二类群表现为花序长;第三类群表现为花冠裂片长。参试紫丁香资源花部性状表型变异丰富。

Variation of Flower Phenotypic Traits on 195 Syringa oblata Seed Seedings Single Trees

To accurately grasp the variation degree of floral traits and the phenotypic diversity level of Syringa oblata,so as to provide a theoretical basis for the breeding of S.oblata excellent varieties.The 195 seed seedlings of S.oblata trees around 8 years old were used to analyze the genetic variation,trait correlation and clustering relationship of 5 quantitative traits and four quality traits.Five quantitative traits were extremely significant differences among the 195 trees(P<0.01),and accorded with the normal distribution.The genetic variation coefficients were from 19.72%-30.22%,with an average of 24.97%,and the inflorescence length was the largest.According to the ISCC-NBS method,the group colors were divided into six color groups,namely white,pale pink,purple,purplish red,purplish pink and violet groups.Purple group(54.35%)and purplish red group(32.31%)accounted for the largest proportion;the diversity index of four quality traits ranged from 0.36 to 1.09,with an average of 0.86,of which the corolla lobes(state)were the largest,indicating that the quality traits were abundant within 195 trees.By correlation analysis,there were significant positive correlations between the five quantitative traits,and the correlation coefficient between inflorescence length and inflorescence width was the larges(t 0.767).By cluster analysis,the 195 samples of S.oblata can be divided into three categories based on euclidean distance.The first type was characterized by corolla tube length;the second group was characterized by long inflorescence;the last type was characterized by corolla lobes.The phenotypic variation of floral traits in the tested genetic resources of S.oblata was richer.