Abstract: The test wanted to post variation law and genetic diversity by studying different regional populations of Houttuynia cordata Thunb germplasm resources in Huaihua city of Hunan province, and supplied farther evidences for protection and utilization of resources. The differentiation coefficients and genetic parameter and diversity index analysis was applied on the population phenotypic traits of 16 germplasm resources of Houttuynia cordata Thunb from Huaihua city of Hunan Provinces. The frequency is different in the three quality traits which green overground stem, white underground stem and cordiform leaf were representative phenotypic quality traits. The variation coefficients of branch number and fresh weightiness of overground stem, the node number of underground stem, 4-methyl-1-cypropyl-3-cyclohexoally-1-alcoholy and 2, 4-methyl-3-cyclohexoallic cypropyl alcoholy between populations were the higher, whereas the variation coefficient of root diameter was the lowest ;but those of undecanone and branch number of overground stem per plant were lowest(13.4%)and highest respectively(39.8%)on the phenotypic traits within populations. The phenotypic diversity index between populations(0. 213 -0. 804)was relatively higher than that of within populations(0. 182 -0.710), the lowest in root number and the highest in underground fresh weightness ;the phenotypic diversity index of different geographic population was 0. 574 -1. 024 with the highest in Huangyan prefecture and the lowest in Jigongjie prefecture. The mean variation coefficients of between population accounted 1/2 whereas that of within population was 1/3 which the variations between populations were main variation source. The largest phenotypic differentiation coefficient between populations was the branch number of overground (77.04 %)whereas the smallest was root diameter(51.88 %). The absolute genetic advances were smaller (RGS% < 40%) but the heritabilitys were larger(h~2 > 50%)to the most quantity traits under 5% selection intensity. Cluster analysis based on morphological traits showed that the populations could be divided into two and three groups in genetic distance 2.0 and 1.5 respectively Which cluster in same kind was according as firstly color of overground stem, leaf shape next, altitude heigh again, region last. The differentiation coefficients were rich and the differentiation degree were high in populations.

Key words: Houttuynia cordata Thunb, Genetic diversity, Diversity index, Differentiation coefficient

CLC Number: 

• S567.239