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Isolation of Genetic Male Sterile Mutants in a Semidwarf Japonica Rice Cultivar¹

Genetic male sterility was induced in the semidwarfjaponica rice (Oryza sativa L.) cultivar M-101 by treatment of seeds with 30 kR of gamma rays. In the X₂ generation, 251 partially sterile plants which presumably were true steriles that were setting seed due to outcrossing, were selected and designated as Group I lines. Fertile progenies of these X2 plants were considered to beputative F_l's from natural crosses. By a series of progeny tests, which eventually involved confirmed crosses, eight lines which carried single recessive genes for male sterility were derived from these putative F₁'s. In the X₂ generation 18 completely sterile plants, designated Group II lines, also were selected. One single-gene, recessively-inherited genetic male sterile was derived from these 18 lines. Seed set on the male steriles from open pollination by sib plants ranged from 12 to 40% on the eight final Group I lines in 1980, and was less than 1% on the single Group II line. In 1981 open pollination seed set was lower, ranging from 1 to 18%, but evidence of crossing was confirmed by the use of pollinators with a marker gene.

Key Words: Oryza sativa • Outcrossing • Recessive gene control

² Contribution from the Univ. of California and the USDA-ARS, Davis, CA 95616.

Received for publication May 5, 1983.