• 中文核心期刊
  • CSCD来源期刊
  • 中国科技核心期刊
  • CA、CABI、ZR收录期刊

艾纳香种质资源表型性状遗传多样性分析

Genetic Diversity on Phenotypes of Blumea balsamifera Germplasms

  • 摘要:
      目的  分析艾纳香种质资源表型性状的多样性,为良种选育提供科学依据。
      方法  以159份艾纳香种质资源为材料,进行9个数量性状和13个质量性状的测定,并采用遗传多样性分析、相关性分析、主成分分析和聚类分析等方法进行遗传多样性分析。
      结果  数量性状中遗传多样性指数最高的是株高(2.072),变异系数最大的是花枝数(32.76%);质量性状中遗传多样性指数最高的是叶片形状(1.201)。相关性分析表明,在数量性状中,冠幅与株高、叶宽、叶柄长度、花枝长度、花枝开张角度呈极显著正相关(P<0.01);在质量性状中,叶脉花青苷显色强度与主茎花青苷显色强度、叶片边缘花青苷显色强度和叶柄花青苷显色强度呈极显著正相关(P<0.01)。前8个主成分的累计贡献率达到64.32%,根据各性状的载荷量大小将各因子依次命名为产量因子、显色因子、叶光滑度因子、叶片边缘因子、叶片形状因子、叶片绿色因子和花枝角度因子。基于表型性状,以离差平方和法在遗传距离为10处将供试材料分为3个类群,类群Ⅰ有39份材料,占总数的24.53%;类群Ⅱ有38份材料,占总数的23.90%;群Ⅲ有82份材料,占总数的51.57%。
      结论  159份艾纳香种质资源的表型性状具有丰富的遗传多样性,叶片形状的变异类型较为丰富,叶宽可作为日后选育高产艾纳香种质的指导目标性状。

     

    Abstract:
      Objective  The diversified phenotypic characteristics of Blumea balsamifera (L.) DC. germplasms were classified to facilitate the breeding program.
      Method  Nine quantifiable and 13 quality phenotypic traits of the plant were used to describe the 159 germplasm samples of B. balsamifera. Genetic diversity, correlation, principal component, and cluster analyses were applied for the study.
      Result   The genetic diversity on phenotypic characteristics of the collected germplasms was rich. Among the quantifiable traits, plant height had the highest genetic diversity index of 2.072; and, number of flowering branches topped the coefficient of variation at 32.76%. The crown breadth of the plants was found significantly correlated with the height, leaf width, petiole length, length of flower branch, and opening angle of flower branch (P<0.01). On the quality traits, the highest genetic diversity index of 1.201 was the leaf shape. And, the color intensity of anthocyanin in leaf vein and that in main stem, as well as, those in leaf edge and petiole were significantly correlated. The cumulative contribution rate of the first eight principal components reached 64.32%. They included the factors associated with yield, color-intensity, leaf smoothness, leaf edge, leaf shape, leaf greenness, and flower-branch angle. Based on the phenotypic traits, the sum of squares deviations method using the genetic distance of 10 on the germplasms divided the 159 varieties into Group Ⅰ of 39 that accounted for 24.53% of the total, Group Ⅱ of 38 that accounted for 23.90% of the total, and Group Ⅲ of 82 that accounted for 51.57% of the total.
      Conclusion   Genetically, the phenotypic characteristics of the 159 B. balsamifera germplasms appeared richly diversified. The leaf width of the plants could be the most outstanding trait for breeding selection of high-yield B. balsamifera varieties.

     

/

返回文章
返回