偃麦草种质资源外部性状变异及其形态类型的初步研究

对41份偃麦草Elytrigia repens种质资源的16个外部性状变异及其分布规律进行研究,并在对16个指标性状进行相关分析及主成分分析的基础上,对34份材料进行聚类分析。结果表明,偃麦草种内形态指标变异较大,变异系数为4.88%～33.30%,其中叶层高度变异系数最大,达33.30%,其次为旗叶长(26.03%),而种子宽度、种子长度、种子厚度、颖长、叶长变异较小,均在10.0%以下;海拔高度与偃麦草生殖枝高呈显著正相关(P0.01),与颖长呈显著负相关(P0.01),而在纬度上的相关性却呈现相反趋势;经度仅与穗下第1节间长呈显著正相关(P0.01);在对外部性状相关分析及主成分分析的基础上,通过聚类分析,在欧氏距离5.0处,34份偃麦草材料可被划分为高大型、偏高大型、特殊型、低矮型4个类型,且特殊型和低矮型均具有开发为草坪草的潜能。

Preliminary study on morphological variation and types of Elytrigia repens germplasm resources

The 16 morphological variations and their distribution rules of 41 accessions of Elytrigia repens were studied,and the cluster analysis of 34 materials was carried out based on correlation analysis and principal component analysis of 16 morphological indexes. The result showed that the variations of the morphological indexes were great within species,and the coefficient of variation was 4.88%-33.30%. The coefficient of variation of leave level height was 33.30% and ranked the first,followed by length of fla...