Abstract
The genetic structure of 5 local strains of the barley variety, “Iwate Mensury No. 2” was analyzed. Differences found between strains in agronomic characters were of statistical nature (Tab. 1.). A strain obtained from the Tohoku Nat. Agr. Exp. Sta. included a wide range of variation in the type index of young plants and in the date of heading coverning 22 days. This strain included 6 of 8 genotypes expected from all combinations of three pairs of marker genes (S s, Hs hs and Wh wh). It was found that type III (S hs wh) was predominant in all strains and amounted to 100% in the southern strains, D and E (Tab. 5 and 6). Increasing tendency of spring habit type and of type III in the southern locations was striking.
Data obtained for this variety were compared with those reported for another mixed barley variety “Hosogara No. 2”. and it was found that the obtained results were in general similar.
It may be worth mentioning that the southern strains of both varieties consisted of spring habit plants, and that a wide range of variation in the date of heading was found in their northern strains. It was assumed that the latter phenomenon may be connected with a variability within those strains regarding the response to short day length. Thus, the conclusions derived from the data obtained for “Hosogara No. 2” were further strengthened by the results of new experiment with “Iwate Mensury No. 2”.
