枸杞子 品種의 形態的 特性에 대한 遺傳統計量의 年次的 變動

Year variations of genetic parameters for morphological characters of tea tree (lycium chinense miller) varieties

The objective of this study was to compare year variations of heritability, phenotypic, genotypic and environmental correlations as well as pathway coefficients for morphological characters of tea tree to provide useful selection information for improving tea tree. The data collected from the performance yield trials from 1979 to 1981 were used in this study. 1. The genetic variance of number of total leaves in main stem was not only greatly varied with year, but also the largest among all characteristics studied. The genetic variances of height of main stem and number of wide leaves in main stem were greater than the environmental variances of them, but the year variations were very large. Other characteristics showed higher genetic variance than environmental variances, and year variations were very small. 2. Both year and variety x year interaction were highly significant sources of variation for all characteristics pooled from three years data and the year x variety interactions were highly significant. 3. All characteristics showed high broad sense heritability, and the broad sense heritabilities were not varied with year. 4. The genetic correlation coefficients between root yield and length of internode, and between root yield and number of internode were positive, and the year variations were not large. 5. The pathway coefficients of the characters studied were generally small. The number of internode in main stem, length of internode in main stem and height of stem effected directly the yield of root in tea tree.