摘要
对蒲公英属橡胶草及其同域10个近缘种共13份材料的59个表型性状(数量性状24个,质量性状35个)进行了观测,通过方差分析、因子分析和聚类分析对其形态性状多样性和种间亲缘关系进行研究,以明确各表型性状对种质分类的重要性及其贡献,为橡胶草品种选育及蒲公英属植物的分类和种质资源保存利用提供依据。结果显示:(1)13份蒲公英属种质资源在数量性状上变异系数在7.50%~55.00%之间,平均为28.25%,多样性指数在1.157~2.032之间,平均为1.663,具有丰富的表型多样性。(2)质量性状方面,变异系数的变化范围在20.40%~67.44%之间,多样性指数变化范围在0.271~1.672之间,平均为1.136,总体上是数量性状形态多样性指数大于质量性状。(3)59个性状的主成分分析中前7个主成分的累计贡献率为84.767%,花部形态变异是蒲公英属植物表型分化的主要因素。(4)利用欧氏距离进行的Ward’s聚类分析结果表明,13份材料可分为4大类群,同一地区的大部分种聚在一起,呈现出一定的地域性,亲缘关系较近;但来源于3个居群的橡胶草却被划分在2个类群中,表现出较远的亲缘关系。研究表明,蒲公英属植物种质材料具有丰富的质量和数量性状变异,表型多样性丰富。
The observation data of 59 phenotypic （Quantity traits 24, Quality traits 35） of Taraxacum kok-saghyz and its 10 sympatric species were analyzed through Variance Analysis, Factor Analysis and Cluster Analysis to reveal the phenotypic diversity of genus Taraxacum and the relationship between the species was also studied.The results showed that： （1）the coefficient of variation of quantitative characters of 13 germplasm resources was 7.50%-55.00%, and the average value was 28.25%, and the diversity index was between 1.157-2.032, with an average of 1.663.（2）The variation range of the coefficient of variation was between 20.40%-67.44%, and the variation range of diversity index was between 0.271-1.672, with an average of 1.136.The morphological diversity index of quantitative traits was greater than that of quality traits;（3）the cumulative contribution rate of the first 7 principal components is 84.767%, in the principal component analysis of 59 traits, and traits the floral morphological variation was a major factor contributing to the phenotypic differentiation of Taraxacum.（4）The results of Wards cluster analysis using Euclidean distance, 13 collections were divided into 4 groups at a genetic distance 7.5.The species collected from the same region tended to be clustered into the same groups, indicating close relationship, while the 3 collections of T.kok-saghyz were clustered into 2 different groups showing distant relationships.The results showed that Taraxacum was a genus rich in both quality and quantitative trait variation, resulting phenotypic diversity.
出处
《西北植物学报》
CAS
CSCD
北大核心
2017年第6期1205-1215,共11页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31460631)
关键词
橡胶草
蒲公英属
表型多样性
因子分析
聚类分析
Taraxacum kok-saghyz
Taraxacum
phenotypic diversity
factor analysis
cluster analysis
