Genetic diversity analysis of 117 potato germplasm resources with high resistance to late blight
This study used 117 potato germplasm resources with high resistance to late blight preserved in the National Potato Germplasm Resource Bank as experimental materials.Through methods such as genetic diversity index,coeffi-cient of variation,and cluster analysis,26 traits of 117 experimental materials were analyzed.The results showed that the genetic diversity index of 20 qualitative traits ranged from 0.35 to 1.61.The order of variation coefficients for the 6 quanti-tative traits was:Number of main stems＞tuber yield＞plant height＞dry matter content＞stem diameter＞starch content.The genetic diversity index ranged from 0.99 to 1.50.Through cluster analysis,117 experimental materials were divided into 4 categories.The first category of materials has rich diversity and overall excellent performance,which is more in line with the characteristics of existing cultivated varieties.The average yield of Class Ⅱ materials is relatively high,which aggre-gates four high resistance potato varieties mainly planted in China and can be used as direct parents for late blight resis-tance breeding.The third type of material has a larger number of main stems and the overall plant exhibits a short day type,which can be used as antigen materials for resistance breeding.The fourth type of resource contains four resources,with the highest yield performance and can be directly used for production and breeding of parents.Through R8 molecu-lar marker detection on 117 materials,104 resources contain R8 gene,which can be used as the basic material for late blight resistance gene aggregation breeding.
万方数据
维普
