内蒙古扁蓿豆野生资源形态特征研究

Morpholgical Properties of Wild Resources in Medicago ruthenica in Inner Mongolia

对产自内蒙古不同分布区12份扁蓿豆种质资源的12个形态性状进行主成分和聚类分析。结果表明,12个形态性状在材料间都表现显著差异,扁蓿豆种质资源遗传变异丰富;通过多变量的主成分分析,前6个主成分代表了扁蓿豆形态多样性的85.72%,株高、叶面积、叶长、株丛直径、枝条长和千粒重等6个性状是造成扁蓿豆表型差异的主要因素;基于形态性状的聚类分析把12份材料聚为4类,其中第4类MR-12扁蓿豆资源的株高、枝条长和株丛直径明显高于其他类,叶片大且叶量丰富,营养性状表现良好;结实性状中荚果长和千粒重较大,综合性状表现较好,可以作为引种驯化和育种的试验材料。

The statistical methods of cluster analysis and the Principal Component Analysis （PCA） were used to study 12 morphological characteristics from 12 populations of Medicago ruthenica in Inner Mongolia. The results show ：the genetic diversity of 12 gemplasm is abundant,inter-population variation occurred remarkably in most morphological character. The farward six principal components totally represented 85.72% of morphological diversity, principal components analysis showed ： six characters including plant height, branch length, area of leaf, leaf length, plant diameter and 1000-seed weight are mainly factors which produced morphological variation of Medicago ruthenica. Based on the morphological data, 12 Medicago ruthenica germplasm were clustered into 4 groups. The fourth group, including MR-12 of germplasm,had taller plant height, more plant branches and leaves, bigger pod length, and more 1000-seed weight. The germplasm in cluster had better morphological trait,and it could be used for breeding.