四川白芹品种主要农艺性状与产量的相关性与通径分析OA

[Objective]To systematically evaluate the genetic diversity of agronomic traits and quality characteristics in Sichuan white celery landraces,identify key traits influencing yield per plant,and pro-vide a basis for the conservation,selection,and genetic improvement of superior germplasm resources.[Method]Thirteen local varieties of Sichuan white celery were used as experimental materials,and six-teen agronomic and quality traits were measured.Multivariate statistical methods including analysis of variance(ANOVA),coefficient of variation(CV),correlation analysis,stepwise regression,path analysis,principal component analysis(PCA),and cluster analysis were employed to comprehensively evaluate the genetic variation characteristics of each trait and their contribution to yield per plant.[Result]Sig-nificant differences existed among germplasm resources for all 16 traits,with coefficients of variation ranging from 12.69%to 40.65%.Eight traits,including petiole weight,small leaf weight,yield per plant,vitamin C content,plant height,leaf number per plant,root head diameter,and basal stem diam-eter,exhibited coefficients of variation exceeding 20%,indicating rich genetic variation and substantial selection potential.Correlation analysis revealed significant positive correlations between yield per plant and plant height,first inter-segment length,second inter-segment length,small leaf length,small leaf weight,petiole weight,and basal stem diameter.Stepwise regression analysis identified small leaf weight,petiole weight,and first inter-segment length as key yield-influencing factors,and the stan-dardized coefficients indicate that leaflet weight contributes most significantly to yield(β9=0.611).Path analysis further revealed that leaflet weight and petiole weight exerted the strongest direct positive effects on plant yield,with direct path coefficients of 0.610 and 0.360,respectively,while first inter-segment length primarily influenced yield through indirect effects.Principal component analysis extracted four principal components,cumulatively explaining 83.833%of the variance and covering all 16 agronomic traits.Cluster analysis at a Euclidean distance of 5 divided the test materials into three major groups:high-yield,medium-yield,and low-yield.[Conclusion]Small leaf weight and petiole weight are core traits determining individual plant yield in Sichuan white celery,possessing significant breeding value and serving as priority selection criteria for high-yield breeding.This study clarifies key yield compo-nents and their genetic variation characteristics,providing a theoretical basis for high-yield,high-quality breeding and efficient utilization of germplasm resources in Sichuan white celery.