Analysis of Agronomic Traits and Genetic Diversity of 60 Screw Pepper Germplasm Resources
In order to further improve germplasm and breed new screw pepper,60 screw pepper germplasm materials through many years of selfing and homozygosity by the pepper team of Horticulture of College,Shanxi Agricultural University were as materials.The main agronomic traits were investigated and then the hereditary diversity,correlation analyais,principal component analysis(PCA)and clustering analysis were conducted.The results showed that the 1 1 agronomic traits had different degrees of variation,the coefficient of variation varied from 10.52％to 58.07％,with an average of 32.04％.The coefficient of variation of the fruit number per plant was the highest(58.07％),and the coefficient of variation of the longitudinal diameter of fruit was the lowest(10.52％).The correlation analysis showed that there were extremely significant positive correlations between plant height and plant span,between transverse diameter of fruit and pulp thickness,weight per fruit,between weight per fruit and ventricular number,pulp thickness,and there were significant positive correlations between transverse diameter of fruit and ventricular number.There were extremely significant negative correlations between longitudinal diameter of fruit and ventricular number,between fruits number per plant and pulp thickness,transverse diameter of fruit,weight per fruit,and there were significant negative correlations between fruits number per plant and ventricular number.Based on 1 1 agronomic traits,the principal component analysis got 4 principal components whose cumulative contribution rate was 70.628％;the cluster analysis divided 60 germplasms into 5 categories by Euclidean distance 5.Above results provided a basis for the utilization of germplasm resources and the breeding of screw pepper varieties suitable for market demand.
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