Abstract

The mode of inheritance of geotropic responses in wheat primary seminal roots was investigated in materials cultured on an agar medium. F1 and F2 plants frorn the cross between Norin 58, which shows large growth angles of inclination of the roots, and Chinese Spring, which shows small values, were examined. Means and standard deviations of growih angles of inclination of the roots for Norin 58, Chinese Spring and the F1 plants were 68±21°, 16±14°and 15±21°, respectively. The corresponding values of the F2 plants ranged from O' to 90°. The observed segregation of the F2 plants with small (0∼50°) and large (60∼90°) values fitted to the ratio of 3 : 1. Therefore, the limited geotropic response associated with a small growth angle of inclination of the root was considered to be controlled by a single dominant gene.

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