The Segregation Mode of Plant Height in the Cross of Rice Varieties Ⅵ. Linkage Analysis of the Semi-dwarfness of the Rice Variety “Tongil”

The twenty one marker genes of the rice genetic stocks, of which plant height was not allelic to the semi-dwarfness, were transferred to the semi-dwarf variety Tongil by two or three times back-crosses. The homozygous lines for the semi-dwarfness and marker genes were crossed to the allelic tall varieties a_nd the linkage relationships between the semi-dwarfness and the marker genes were studied. The semi-dwarf plant height of Tongil appeared to be controlled by a single recessive gene, designated as d-t, and to be allelic to the tall height of Binato, HP 736, 7037 and 7157. The semi-dwarf gene of Tongil was linked with the marker genes such as A, Pp, Pn, and Pau of the linkage group Ⅲ with the recombination values of 24.8%, 35.1%. 40.9% and 42.9% respectively. The arrangement of these genes are assumed as follows; d-t-A-Pp-Pn-Pau. The semi-dwarf marker lines having the genes wx, C, Cl, v, Ph+, lg, Pr, Pb, Pn, Pau, A+, g, Rc, gh, la, nl, bl, bc, gl, Bh, and Bf were bred.