不同淮山药种质（品种）的粘度比较与聚类分析

【目的】了解不同淮山药种质的粘度特性，为淮山药种质资源的育种和利用提供参考依据。【方法】对不同淮山药种质（品种）的粘度进行测定，并对结果进行聚类分析。【结果】15个淮山药品种（种质）的粘度变异系数为56.18%，多态性丰富；淮山药粘度最高的是GY44，达81.6 dpa.s，其次为桂淮2号和GY17，粘度分别达74.3和71.7 dpa.s。不同淮山药类型粘度高低为叶长心型>茎四棱型 >野生型>叶三出浅裂型。通过聚类分析，可将15个淮山药品种（种质）分为高粘度型、中粘度型和低粘度型3大类。【结论】GY44、桂淮2号和GY17可作为加工型淮山药品种开发利用或育种的中间材料，而粘度差异可作为淮山药种质分类的依据之一。

Comparative analysis of different yam(Dioscorea opposita Thunb.) germplasm resources and their clustering on the basis of viscosity characteristics

Objective]The present experiment was conducted to investigate the viscosity characteristics of different yam(Dioscorea opposita Thunb.) germplasm resources to provide reference for its application in varietal breeding program.Method]The viscosity of different yam germplasm was determined and data were utilized in performing cluster analysis.Result]The coefficient of variation in viscosity of 15 yam germplasm(varieties) was 56.18%,which showed rich polymorphism.The highest viscosity was observed in variety GY44(81.6 dpa.s),followed by Guihuai 2(74.3 dpa.s) and GY17(71.7 dpa.s).Among different types of yam germplasm(varieties),the viscosity in its decreasing order was:long-heart leaf type >tetragonous stem type>wild type>three-lobed leaf type.On the basis of cluster analysis,the fifteen yam varieties(germplasm) were classified into 3 types,viz.,high-viscosity type,middle-viscosity type and low viscosity type.Conclusion]The yam variety GY44,Guihuai 2 and GY17 can be used as intermediate material in breeding programs.The differences in viscosity parameter could be used as criteria for classifying yam germplasm resources.