杉木单交F1代的表型变异及杂种优势分析OA北大核心CSTPCD

For targeted variation creation in Chinese fir and selection of superior individuals within families,this study targeted the 6421 by 27 elite crosses and their 6-year F1 progeny from a single cross.Variation analysis was conducted on phenotypic values for 12 traits indicative of morphology,growth,and wood properties to explore phenotypic variation behaviors and inter-trait relationships in superior Chinese fir germplasm.Results revealed variation coefficients for the 12 traits in the F1 population from 8.21%to 37.97%,with five traits exceeding 15%.Among 66 trait correlations,36.36%showed moderate positive relationships.Basic wood density displayed a coefficient of variation of 8.21%,correlating non-significantly with the other 11 traits.In total,131 F1 offsprings displaying mid-parental heterosis in both directions,presented eight traits exhibiting dominant effects,and heterosis rates ranging from-31.18%to 90.44%,notably with first-order lateral branch number showing significant over-dominance.Cluster analysis divided the 131 F1 offsprings into three major and six sub-clusters,each with precise characteristics.F1 hybrids of Chinese fir showed substantial variation in growth and branching traits,with dense and broad-crowned firs having a pronounced growth advantage in the early stages.First-order lateral branch numbers in Chinese fir demonstrated apparent hybrid vigor,and their morphological traits showed dominant inheritance.