Analysis of F1 representative variation and heterosis of Chinese fir
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.
Chinese firsingle-crossed offspringphenotypic variationhybrid vigorgenetic effectcluster analysis
国家科技期刊平台
NSTL
万方数据
