Relationships between coefficient of parentage and genetic distance based on DNA polymorphism in barley cultivars.

摘要

The genetic relationships between cultivars are estimated either by coefficient of parentage, which is calculated using the database of cultivar lineage, or from genetic distance, which is calculated based on DNA polymorphism using molecular markers. In this study, Euclidean distances and Nei's genetic distances among 22 barley cultivars were calculated using molecular markers. The results of cluster analysis based on Euclidean distances were well-explained by lineages of the cultivars. A significant correlation (-0.526--0.650) between the coefficients of parentage and Nei's genetic distances was observed among the 22 cultivars grown in Japan. Thus, the validity of the coefficients of parentage between 2 cultivars, calculated based on the assumption that the cultivars derived from crossing have half of the genetic materials of each parent, was supported by the genetic distance estimated from DNA polymorphism. On the other hand, the alleles detected by the molecular markers were supposed to be nearly equally distributed to the offspring in the breeding process.