为了筛选出扦插生根能力较强的传统秋菊（Chrysanthemum morifolium Ramat.）品种，对39个传统秋菊品种扦插12 d的8个根系形态指标进行差异分析、相关性分析和主成分分析，并对这些传统秋菊品种的扦插生根能力进行隶属函数分析和分级。结果显示：供试传统秋菊品种的总根数为3.3～44.0，总根长、平均根长和最长根长分别为2.463～129.174、0.632～4.470和1.610～7.964 cm，根直径为0.200～0.405 mm，根投影面积和根表面积分别为0.102～3.062和0.319～9.619 cm²，总根体积为0.002～0.079 cm³，且多数指标以‘火凤凰’（‘Huofenghuang’）最小。这些根系形态指标的变异系数为15.789%～51.605%，其中，总根长的变异系数最大，根直径的变异系数最小，其余指标的变异系数均大于32%。供试传统秋菊品种的多数根系形态指标间存在显著(P＜0.05)或极显著(P＜0.01)正相关。主成分分析结果显示：前3个主成分的累计贡献率达97.976%。隶属函数分析和分级结果表明：供试传统秋菊品种的扦插生根能力分为优秀、良好、中等和偏差4个等级，‘龙都春丽’（‘Longdu Chunli’）、‘玉楼人醉’（‘Yulou Renzui’）、‘龙都月华’（‘Longdu Yuehua’）、‘圣光华宝’（‘Shengguang Huabao’）、‘龙都秋枫’（‘Longdu Qiufeng’）、‘龙都春晓’（‘Longdu Chunxiao’）的扦插生根能力优秀，综合得分均大于0.70。根投影面积、根表面积和总根体积在不同等级间差异显著。研究结果显示：不同传统秋菊品种间扦插苗的根系形态指标变异较大，其中，‘龙都春丽’等6个品种的扦插生根能力较强，可作为传统秋菊品种遗传改良的亲本。

To screen out traditional autumn chrysanthemum (Chrysanthemum morifolium Ramat.) cultivars with strong cutting rooting ability, difference analysis, correlation analysis, and principal component analysis were performed for 8 root morphological indexes of 39 traditional autumn chrysanthemum cultivars after 12 d of cutting, and subordinate function analysis and classification were conducted for the cutting rooting ability of these traditional autumn chrysanthemum cultivars. The results show that the total root number of  traditional autumn chrysanthemum cultivars for testing is 3.3-44.0, the total root length, average root length, and longest root length are 2.463-129.174, 0.632-4.470, and 1.610-7.964 cm, respectively, the root diameters are 0.200-0.405 mm, the root projected area and root surface area are 0.102-3.062 and 0.319-9.619 cm², respectively, the total root volume is 0.002-0.079 cm³, and most indexes of ‘Huofenghuang’ are the smallest. The coefficients of variation of these root morphological indexes are 15.789%-51.605%, in which, the coefficient of variation of total root length is the greatest, while that of root diameter is the smallest, and those of the other indexes are all greater than 32%. There are significant (P<0.05) or extremely significant (P<0.01) positive correlations between most root morphological indexes of  traditional autumn chrysanthemum cultivars for testing. The principal component analysis result shows that the accumulative contribution rate of the first three principal components reaches 97.976%. The results of subordinate function analysis and classification show that the cutting rooting ability of  traditional autumn chrysanthemum cultivars for testing are divided into 4 grades namely excellent, good, moderate, and poor, those of ‘Longdu Chunli’, ‘Yulou Renzui’, ‘Longdu Yuehua’, ‘Shengguang Huabao’, ‘Longdu Qiufeng’, and ‘Longdu Chunxiao’ are excellent, and their comprehensive scores are all greater than 0.70. The differences in root projected area, root surface area, and total root volume are significant between different grades. It is suggested that the variations in root morphological indexes of cutting seedlings among different traditional autumn chrysanthemum cultivars are relatively great, in which, the cutting rooting abilities of 6 cultivars such as‘Longdu Chunli’ are relatively strong, and they can be used as parents for genetic improvement of traditional autumn chrysanthemum cultivars.