Abstract
The pedigree of two-rowed malting barley lines bred at Tochigi Prefectural Agricultural Experiment Station (breeding lines) was analyzed. The ancestors with greatest genetic contribution to the breeding lines were Harunanijo (average coefficient of parentage 0.457) followed by Misatogolden (0.442) and Goldenmelon (0.396), in this order. The coefficients of parentage among the breeding lines were 0.115∼0.856. Cluster analysis based on these values showed a narrow genetic background among these breeding lines. Harunanijo contributed to many agronomic traits and brewing quality. The coefficients of parentage between the breeding lines and parents used for disease resistance were very row at 0.125∼0.008. It is necessary to introduce and efficiently use new parental materials to expand the genetic background. Studies considering the coefficients of parentage and genealogical trees could contribute to more effective breeding.
