百合种质资源表型多样性分析及评价OA

To investigate the variation characteristics of phenotypic traits in lily germplasm resources and screen superior core collections,taking 100 lily germplasm resources as the objects,18 phenotypic traits were determined.Comprehensive diversity analysis and integrated evaluation were performed using correlation analysis,phenotypic cluster analysis,and principal component analysis(PCA),incorporating coefficients of variation and diversity indices for each trait.The results showed that the phenotypes of 100 lily germplasm resources revealed significant diversity and high variability.The coefficients of variation for 10 quantitative traits ranged from 24.80％to 57.50％,while the Shannon-Wiener diversity indices for 8 qualitative traits varied from 4.43 to 4.56.Plant height was positively correlated with all other phenotypic traits,showing the highest correlation with leaf length,with a correlation coefficient reaching 0.53.Flower diameter was significantly positively correlated with outer petal width,with a correlation coefficient reaching 0.75.Most traits were negatively correlated with flower number.Based on quantitative traits,cluster analysis grouped the 100 lily accessions into 4 major clusters.Cluster Ⅰ had 42 accessions,characterized primarily by short plants with large flowers and numerous buds.Cluster Ⅱ had 44 accessions,characterized by tall plants with abundant flowers.Cluster Ⅲ had 8 accessions,characterized by short plants with small flowers and few buds.Cluster IV had 6 accessions,characterized by tall,robust plants.PCA extracted 9 principal components(PC)from the different phenotypic trait indicators,with a cumulative contribution rate reaching 87.01％.A comprehensive evaluation model was established using the variance contribution rates of the PC as weight coefficients,resulting in a ranking of the 100 germplasm accessions.Lily germplasm resources possessed high phenotypic diversity and variability.There were many significant correlations among most quantitative traits and identified 4 core germplasm clusters through cluster analysis.Cluster Ⅰ could serve as parental resources for potted lily breeding;cluster Ⅱ was suitable for improving ornamental characteristics;cluster Ⅲ had significant potential for micro-miniature lily breeding;and cluster Ⅳ could be utilized for breeding tall,highly resistant garden lilies.Furthermore,10 important breeding materials with excellent comprehensive traits were screened.Above results provided references and theoretical support for parental selection in lily breeding and the utilization of germplasm resources.